To all our customers Regarding the change of names mentioned in the document, such as Mitsubishi Electric and Mitsubishi XX, to Renesas Technology Corp. The semiconductor operations of Hitachi and Mitsubishi Electric were transferred to Renesas Technology Corporation on April 1st 2003. These operations include microcomputer, logic, analog and discrete devices, and memory chips other than DRAMs (flash memory, SRAMs etc.) Accordingly, although Mitsubishi Electric, Mitsubishi Electric Corporation, Mitsubishi Semiconductors, and other Mitsubishi brand names are mentioned in the document, these names have in fact all been changed to Renesas Technology Corp. Thank you for your understanding. Except for our corporate trademark, logo and corporate statement, no changes whatsoever have been made to the contents of the document, and these changes do not constitute any alteration to the contents of the document itself. Note : Mitsubishi Electric will continue the business operations of high frequency & optical devices and power devices. Renesas Technology Corp. Customer Support Dept. April 1, 2003 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER GENERAL DESCRIPTION Comparator circuit ...................................................... 8 channels Clock generating circuit ..................................... Built-in 2 circuits (connect to external ceramic resonator or quartz-crystal oscillator) Power source voltage ................................................ 3.0 to 3.6 V Power dissipation In high-speed mode .......................................................... 20 mW (at 8 MHz oscillation frequency, at 3.3 V power source voltage) In low-speed mode ......................................................... 330 mW (at 32 kHz oscillation frequency, at 3.3 V power source voltage) Operating temperature range .................................... -20 to 85C The 3885 group is the 8-bit microcomputer based on the 740 family core technology. The 3885 group is designed for Keyboard Controller for the note book PC. The multi-master I2C-bus interface can be added by option. FEATURES <Microcomputer mode> Basic machine-language instructions ...................................... 71 Minimum instruction execution time .................................. 0.5 s (at 8 MHz oscillation frequency) Memory size ROM ................................................................. 32K to 60K bytes RAM ............................................................... 1024 to 2048 bytes Programmable input/output ports ............................................ 72 Software pull-up transistors ....................................................... 8 Interrupts ................................................. 22 sources, 16 vectors Timers ............................................................................. 8-bit 4 Watchdog timer ............................................................ 16-bit 1 PWM output .................................................................. 14-bit 2 Serial I/O ....................... 8-bit 1(UART or Clock-synchronized) Multi-master I2C bus interface (option) ........................ 1 channel LPC interface .............................................................. 2 channels Serialized IRQ .................................................................. 3 factor A-D converter ............................................... 10-bit 8 channels D-A converter ................................................. 8-bit 2 channels <Flash memory mode> Supply voltage ................................................. VCC = 3.3 0.3V Program/Erase voltage ................................. VPP = 5.0 V 10 % Programming method ...................... Programming in unit of byte Erasing method Parallel I/O mode CPU reprogramming mode Program/Erase control by software command Number of times for programming/erasing ............................ 100 Operating temperature range (at programming/erasing) ........................................................................ Room temperature APPLICATION Note book PC 42 41 44 43 48 47 46 45 51 50 49 61 40 62 63 64 65 66 67 68 69 70 71 72 73 74 75 39 38 37 36 35 34 33 M38857M8-XXXHP M38858MC-XXXHP M38859M8-XXXHP M38859FFHP 32 31 30 29 28 P16 P17 P20/CMPREF P21 P22 P23 P24(LED0) P25(LED1) P26(LED2) P27(LED3) VSS XOUT XIN P40/XCOUT P41/XCIN RESET CNVSS VPP P42/INT0 P43/INT1 P44/RXD 20 19 17 16 18 15 13 14 12 9 11 10 6 P60/AN0 P77/SCL P76/SDA P75/INT41 P74/INT31 P73/INT21 P72 P71 P70 P57/DA2/PWM11 P56/DA1/PWM01 P55/CNTR1 P54/CNTR0 P53/INT40 P52/INT30 P51/INT20 P50/INT5 P47/SRDY/CLKRUN P46/SCLK P45/TXD 7 8 22 21 3 4 5 79 80 2 76 77 78 27 26 25 24 23 1 P31/PWM10 P30/PWM00 P87/SERIRQ P86/LCLK P85/LRESET P84/LFRAME P83/LAD3 P82/LAD2 P81/LAD1 P80/LAD0 VCC VREF AVSS P67/AN7 P66/AN6 P65/AN5 P64/AN4 P63/AN3 P62/AN2 P61/AN1 57 56 55 54 53 52 60 59 58 P32 P33 P34 P35 P36 P37 P00 P01 P02 P03 P04 P05 P06 P07 P10 P11 P12 P13 P14 P15 PIN CONFIGURATION (TOP VIEW) : Flash memory version Package type : 80P6Q-A Fig. 1 Pin configuration 1 2 Fig. 2 Functional block diagram 29 XCIN XCOUT Sub-clock Sub-clock input output Main-clock output XOUT P7(8) 2 3 4 5 6 7 8 9 I/O port P7 63 64 65 66 67 68 69 70 I/O port P8 CLKRUN Reset P8(8) LPC interface S CL S DA I C 2 Watchdog timer Clock generating circuit 28 Main-clock input XIN 72 73 AVSS VREF INT21, INT31, INT41 I/O port P5 I/O port P6 P5(8) D-A converter1 (8) PC H 10 11 12 13 14 15 16 17 P6(8) D-A converter 2 (8) ROM 74 75 76 77 78 79 80 1 A-D converter (10) RAM 30 VSS INT20, INT30, INT40, INT5 PS INT0, INT1 I/O port P4 18 19 20 21 22 23 26 27 P4(8) PC L S Y X A SI/O(8) C P U 71 VCC FUNCTIONAL BLOCK DIAGRAM (Package : 80P6Q-A) XCIN XCOUT P3(8) CNTR0 I/O port P3 P2(8) I/O port P2 P1(8) I/O port P1 39 40 41 42 43 44 45 46 CMPREF P0(8) I/O port P0 47 48 49 50 51 52 53 54 PWM10, PWM11 PWM00, PWM01 31 32 33 34 35 36 37 38 Key-on wake-up PWM1(14) Timer Y (8) Timer X (8) Timer 2 (8) Timer 1 (8) PWM0(14) Prescaler Y (8) Prescaler X (8) Prescaler 12 (8) CNTR1 24 CNVSS 55 56 57 58 59 60 61 62 Comparator 25 RESET Reset input MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER PIN DESCRIPTION Table 1 Pin description (1) Pin Functions Name Function except a port function *Apply voltage of 3.0 V 10 % to Vcc, and 0 V to Vss. VCC, VSS Power source CNVSS CNVSS input VREF Reference voltage *Reference voltage input pin for A-D and D-A converters. AVSS Analog power source *Analog power source input pin for A-D and D-A converters. *Connect to VSS. RESET Reset input *Reset input pin for active "L". XIN Clock input XOUT Clock output *Connected to VSS. *In the flash memory version, this pin functions as the VPP power source input pin. *Input and output pins for the clock generating circuit. *Connect a ceramic resonator or quartz-crystal oscillator between the XIN and XOUT pins to set the oscillation frequency. *When an external clock is used, connect the clock source to the XIN pin and leave the XOUT pin open. *8-bit I/O port. *I/O direction register allows each pin to be individually programmed as either input or output. P00-P07 I/O port P0 *CMOS compatible input level. *CMOS 3-state output structure or N-channel open-drain output structure. *8-bit I/O port. P10-P17 I/O port P1 *I/O direction register allows each pin to be individually programmed as either input or output. *CMOS compatible input level. *CMOS 3-state output structure or N-channel open-drain output structure. *8-bit I/O port. P20/CMPREF I/O port P2 P21-P27 *I/O direction register allows each pin to be individually programmed as either input or output. *CMOS compatible input level. *CMOS 3-state output structure. *P24 to P27 (4 bits) are enabled to output large current for LED drive. *8-bit I/O port. P30/PWM00 P31/PWM10 *I/O direction register allows each pin to be individually programmed as either input or output. I/O port P3 P32-P37 *Comparator reference power source input pin *CMOS compatible input level. *CMOS 3-state output structure. *These pins function as key-on wake-up and comparator input. *These pins are enabled to control pull-up. *Key-on wake-up input pins *Comparator input pins *PWM output pins *Key-on wake-up input pins *Comparator input pins 3 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Table 2 Pin description (2) Pin Functions Name P40/XCOUT P41/XCIN *8-bit I/O port with the same function as port P0 P42/INT0 P43/INT1 CMOS compatible input level P44/RxD P45/TxD P46/SCLK <Input level> I/O port P4 P47/SRDY /CLKRUN P50/INT5 P51/INT20 P52/INT30 P53/INT40 <Output level> P40, P41 : CMOS 3-state output structure Function except a port function *Sub-clock generating circuit I/O pins (Connect a resonator.) *Interrupt input pins P42-P47 : CMOS 3-state output structure or Nchannel open-drain output structure *Serial I/O function pins *Each pin level of P42 to P4 6 can be read even in output port mode. *Serial I/O function pins *Serialized IRQ function pin *8-bit I/O port with the same function as port P0 *CMOS compatible input level *CMOS 3-state output structure *Interrupt input pins I/O port P5 P54/CNTR0 P55/CNTR1 *Timer X, timer Y function pins *D-A converter output pins P56/DA1/PWM01 P57/DA2/PWM11 *PWM output pins *8-bit I/O port with the same function as port P0 P60/AN0-P67/AN7 I/O port P6 *CMOS compatible input level. *A-D converter output pins *CMOS 3-state output structure. *8-bit CMOS I/O port with the same function as port P0 P70 P71 P72 P73/INT21 P74/INT31 P75/INT41 <Input level> P70-P75 : CMOS compatible input level or TTL compatible input level I/O port P7 P76/SDA P77/SCL P80/LAD0 P81/LAD1 P82/LAD2 P83/LAD3 P84/LFRAME P85/LRESET P86/LCLK P87/SERIRQ 4 P76, P77 : CMOS compatible input level or SMBUS input level in the I2C-BUS interface function, <Output structure> N-channel open-drain output structure *Interrupt input pins *I2C-BUS interface function pins *Each pin level of P70 to P75 can be read evev in output port mode. *8-bit CMOS I/O port with the same function as port P0 *CMOS compatible input level. *CMOS 3-state output structure. *LPC interface function pins I/O port P8 *Serialized IRQ function pin MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER PART NUMBERING Product name M3885 8 M C -XXX HP Package type HP : 80P6Q-A ROM number Omitted in the flash memory version. ROM/Flash memory size 1 : 4096 bytes 2 : 8192 bytes 9: 36864 bytes A: 40960 bytes 3 : 12288 bytes B: 45056 bytes C: 49152 bytes D: 53248 bytes 4 : 16384 bytes 5 : 20480 bytes 6 : 24576 bytes E: 57344 bytes 7 : 28672 bytes F: 61440 bytes 8 : 32768 bytes The first 128 bytes and the last 2 bytes of ROM are reserved areas ; user cannot use those bytes. However, they can be programmed or erased in the flash memory version, so that the users can use them. Memory type M : Mask ROM version F : Flash memory version RAM size 0 : 192 bytes 1 : 256 bytes 2 : 384 bytes 3 : 512 bytes 4 : 640 bytes 5 : 768 bytes 6 : 896 bytes 7 : 1024 bytes 8 : 1536 bytes 9 : 2048 bytes Fig. 3 Part numbering 5 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER GROUP EXPANSION Packages Mitsubishi plans to expand the 3885 group as follows. 80P6Q-A .................................. 0.5 mm-pitch plastic molded LQFP Memory Type Support for mask ROM, flash memory version. Memory Size ROM size ........................................................... 32 K to 60 K bytes RAM size .......................................................... 1024 to 2048 bytes Memory Expansion ROM size (bytes) ROM external M38859FF 60K 56K 48K M38858MC 40K 32K M38857M8 M38859M8 24K 16K 8K 256 512 768 1024 1280 RAM size (bytes) 1536 1792 2048 Fig. 4 Memory expansion plan Table 3 Products plan list 6 As of May 2002 Product name (P) ROM size (bytes) ROM size for User in ( ) RAM size (bytes) Package M38857M8-XXXHP M38858MC-XXXHP M38859M8-XXXHP M38859FFHP 32768 (32638) 49152 (19022) 32768 (32638) 61440 1024 1536 2048 2048 80P6Q-A Remarks Mask ROM version Flash memory version MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER FUNCTIONAL DESCRIPTION CENTRAL PROCESSING UNIT (CPU) [Stack Pointer (S)] The 3885 group uses the standard 740 Family instruction set. Refer to the table of 740 Family addressing modes and machine instructions or the 740 Family Software Manual for details on the instruction set. Machine-resident 740 Family instructions are as follows: The FST and SLW instructions cannot be used. The STP, WIT, MUL, and DIV instructions can be used. [Accumulator (A)] The accumulator is an 8-bit register. Data operations such as data transfer, etc., are executed mainly through the accumulator. [Index Register X (X)] The index register X is an 8-bit register. In the index addressing modes, the value of the OPERAND is added to the contents of register X and specifies the real address. [Index Register Y (Y)] The stack pointer is an 8-bit register used during subroutine calls and interrupts. This register indicates start address of stored area (stack) for storing registers during subroutine calls and interrupts. The low-order 8 bits of the stack address are determined by the contents of the stack pointer. The high-order 8 bits of the stack address are determined by the stack page selection bit. If the stack page selection bit is "0" , the high-order 8 bits becomes "0016". If the stack page selection bit is "1", the high-order 8 bits becomes "0116". The operations of pushing register contents onto the stack and popping them from the stack are shown in Figure 7. Store registers other than those described in Figure 7 with program when the user needs them during interrupts or subroutine calls. [Program Counter (PC)] The program counter is a 16-bit counter consisting of two 8-bit registers PC H and PCL. It is used to indicate the address of the next instruction to be executed. The index register Y is an 8-bit register. In partial instruction, the value of the OPERAND is added to the contents of register Y and specifies the real address. b0 b7 A Accumulator b0 b7 X Index register X b0 b7 Y b7 Index register Y b0 S b15 b7 PCH Stack pointer b0 Program counter PCL b7 b0 N V T B D I Z C Processor status register (PS) Carry flag Zero flag Interrupt disable flag Decimal mode flag Break flag Index X mode flag Overflow flag Negative flag Fig. 5 740 Family CPU register structure 7 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER On-going Routine Interrupt request (Note) M (S) Execute JSR Push return address on stack M (S) (PCH) (S) (S) - 1 M (S) (PCL) (S) (S)- 1 (S) M (S) (S) M (S) (S) Subroutine (S) (S) + 1 (PCL) M (S) (S) (S) + 1 (PCH) M (S) (S) - 1 (PCL) Push return address on stack (S) - 1 (PS) Push contents of processor status register on stack (S) - 1 Interrupt Service Routine Execute RTS POP return address from stack (PCH) I Flag is set from "0" to "1" Fetch the jump vector Execute RTI Note: Condition for acceptance of an interrupt (S) (S) + 1 (PS) M (S) (S) (S) + 1 (PCL) M (S) (S) (S) + 1 (PCH) M (S) POP contents of processor status register from stack POP return address from stack Interrupt enable flag is "1" Interrupt disable flag is "0" Fig. 6 Register push and pop at interrupt generation and subroutine call Table 4 Push and pop instructions of accumulator or processor status register 8 Push instruction to stack Pop instruction from stack Accumulator PHA PLA Processor status register PHP PLP MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER [Processor status register (PS)] The processor status register is an 8-bit register consisting of 5 flags which indicate the status of the processor after an arithmetic operation and 3 flags which decide MCU operation. Branch operations can be performed by testing the Carry (C) flag , Zero (Z) flag, Overflow (V) flag, or the Negative (N) flag. In decimal mode, the Z, V, N flags are not valid. *Bit 0: Carry flag (C) The C flag contains a carry or borrow generated by the arithmetic logic unit (ALU) immediately after an arithmetic operation. It can also be changed by a shift or rotate instruction. *Bit 1: Zero flag (Z) The Z flag is set if the result of an immediate arithmetic operation or a data transfer is "0", and cleared if the result is anything other than "0". *Bit 2: Interrupt disable flag (I) The I flag disables all interrupts except for the interrupt generated by the BRK instruction. Interrupts are disabled when the I flag is "1". *Bit 3: Decimal mode flag (D) The D flag determines whether additions and subtractions are executed in binary or decimal. Binary arithmetic is executed when this flag is "0"; decimal arithmetic is executed when it is "1". Decimal correction is automatic in decimal mode. Only the ADC *Bit 4: Break flag (B) The B flag is used to indicate that the current interrupt was generated by the BRK instruction. The BRK flag in the processor status register is always "0". When the BRK instruction is used to generate an interrupt, the processor status register is pushed onto the stack with the break flag set to "1". *Bit 5: Index X mode flag (T) When the T flag is "0", arithmetic operations are performed between accumulator and memory. When the T flag is "1", direct arithmetic operations and direct data transfers are enabled between memory locations. *Bit 6: Overflow flag (V) The V flag is used during the addition or subtraction of one byte of signed data. It is set if the result exceeds +127 to -128. When the BIT instruction is executed, bit 6 of the memory location operated on by the BIT instruction is stored in the overflow flag. *Bit 7: Negative flag (N) The N flag is set if the result of an arithmetic operation or data transfer is negative. When the BIT instruction is executed, bit 7 of the memory location operated on by the BIT instruction is stored in the negative flag. Table 5 Set and clear instructions of each bit of processor status register C flag Z flag I flag D flag B flag T flag V flag N flag Set instruction SEC - SEI SED - SET - - Clear instruction CLC - CLI CLD - CLT CLV - 9 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER [CPU Mode Register (CPUM)] 003B16 The CPU mode register contains the stack page selection bit, etc. The CPU mode register is allocated at address 003B16. b7 b0 1 CPU mode register (CPUM : address 003B16) Processor mode bits b1 b0 0 0 : Single-chip mode 0 1 : Not available 1 0 : Not available 1 1 : Not available Stack page selection bit 0 : 0 page 1 : 1 page Fix this bit to "1". Port P40/P41 switch bit 0 : I/O port function (stop oscillating) 1 : XCIN-XCOUT oscillating function Main clock (XIN-XOUT) stop bit 0 : Oscillating 1 : Stopped Main clock division ratio selection bits b7 b6 0 0 : = f(XIN)/2 (high-speed mode) 0 1 : = f(XIN)/8 (middle-speed mode) 1 0 : = f(XCIN)/2 (low-speed mode) 1 1 : Not available Fig. 7 Structure of CPU mode register 10 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER MEMORY Zero Page RAM Access to this area with only 2 bytes is possible in the zero page addressing mode. RAM is used for data storage and for stack area of subroutine calls and interrupts. Special Page ROM Access to this area with only 2 bytes is possible in the special page addressing mode. ROM is used for program code and data table storage. The first 128 bytes and the last 2 bytes of ROM are reserved for device testing code and the rest is user area. Programming/Erasing of the reserved ROM area is possible in the flash memory version. Interrupt Vector Area The interrupt vector area contains reset and interrupt vectors. Special Function Register (SFR) Area The special function register area contains the control registers such as I/O ports, timers, serial I/O, etc. 000016 SFR area RAM area RAM size (bytes) 1024 1536 2048 Zero page 004016 Address XXXX16 RAM 043F16 063F16 083F16 010016 XXXX16 Not used 0FF016 0FFF16 SFR area YYYY16 Reserved ROM area (Note) (128 bytes) ZZZZ16 ROM area ROM size (bytes) Address YYYY16 Address ZZZZ16 32768 49152 61440 800016 400016 100016 808016 408016 108016 ROM FF0016 FFDC16 Interrupt vector area FFFE16 FFFF16 Special page Reserved ROM area (Note) Notes: This area is reserved in the mask ROM version. This area is usable in flash memory version. Fig. 8 Memory map diagram 11 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER 000016 Port P0 (P0) 002016 Prescaler 12 (PRE12) 000116 Port P0 direction register (P0D) 002116 Timer 1 (T1) 000216 Port P1 (P1) 002216 Timer 2 (T2) 000316 Port P1 direction register (P1D) 002316 Timer XY mode register (TM) 000416 Port P2 (P2) 002416 Prescaler X (PREX) 000516 Port P2 direction register (P2D) 002516 Timer X (TX) 000616 Port P3 (P3) 002616 Prescaler Y (PREY) 000716 Port P3 direction register (P3D) 002716 Timer Y (TY) 000816 Port P4 (P4) 002816 Data bas buffer register 0 (DBB0) 000916 Port P4 direction register (P4D) 002916 Data bas buffer status register 0 (DBBSTS0) 000A16 Port P5 (P5) 002A16 LPC control register (LPCCON) 000B16 Port P5 direction register (P5D) 002B16 Data bas buffer register 1 (DBB1) 000C16 Port P6 (P6) 002C16 Data bas buffer status register 1 (DBBSTS1) 000D16 Port P6 direction register (P6D) 002D16 Comparator data register (CMPD) 000E16 Port P7 (P7) 002E16 Port control register 1 (PCTL1) 000F16 Port P7 direction register (P7D) 002F16 Port control register 2 (PCTL2) 001016 Port P8 (P8)/Port P4 input register (P4I) 003016 PWM0H register (PWM0H) 001116 Port P8 direction register (P8D)/Port P7 input register (P7I) 003116 PWM0L register (PWM0L) 001216 I2C data shift register (S0) 003216 PWM1H register (PWM1H) 001316 I2C address register (S0D) 003316 PWM1L register (PWM1L) 001416 I2C status register (S1) 003416 AD/DA control register (ADCON) 001516 I2 C control register (S1D) 003516 A-D conversion register 1 (AD1) 001616 I2 C clock control register (S2) 003616 D-A1 conversion register (DA1) 001716 I2 C start/stop condition control register (S2D) 003716 D-A2 conversion register (DA2) 001816 Transmit/Receive buffer register (TB/RB) 003816 A-D conversion register 2 (AD2) 001916 Serial I/O status register (SIOSTS) 003916 Interrupt source selection register (INTSEL) 001A16 Serial I/O control register (SIOCON) 003A16 Interrupt edge selection register (INTEDGE) 001B16 UART control register (UARTCON) 003B16 CPU mode register (CPUM) 001C16 Baud rate generator (BRG) 003C16 Interrupt request register 1 (IREQ1) 001D16 Serialized IRQ control register (SERCON) 003D16 Interrupt request register 2 (IREQ2) 001E16 Watchdog timer control register (WDTCON) 003E16 Interrupt control register 1 (ICON1) 001F16 Serialized IRQ request register (SERIRQ) 003F16 Interrupt control register 2 (ICON2) 0FF016 LPC0 address register L (LPC0ADL) 0FF116 LPC0 address register H (LPC0ADH) 0FF216 LPC1 address register L (LPC1ADL) 0FF316 LPC1 address register H (LPC1ADH) 0FF816 Port P5 input register (P5I) 0FF916 Port control register 3 (PCTL3) 0FFE16 Flash memory control register (FMCR) (Note) 0FFF16 Reserved (Note) Note: This applies to only flash memory version. Fig. 9 Memory map of special function register (SFR) 12 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER I/O PORTS All I/O pins are programmable as input or output. All I/O ports have direction registers which specify the data direction of each pin like input/output. One bit in a direction register corresponds to one pin. Each pin can be set to be input or output port. Writing "0" to the bit corresponding to the pin, that pin becomes an input mode. Writing "1" to the bit, that pin becomes an output mode. When the data is read from the bit of the port register corresponding to the pin which is set to output, the value shows the port latch data, not the input level of the pin. When a pin set to input, the pin comes floating. In input port mode, writing the port register changes only the data of the port latch and the pin remains high impedance state. When the P8 function selection bit of the port control register 2 is set to "1", reading from address 001016 reads the port P4 register, and reading from address 001116 reads the port P7 register. Especially, the input level of P42 to P46 pins and P70 to P75 pins can be read regardless of the data of the direction registers in this case. Table 6 I/O port function (1) Pin Name P00-P07 Port P0 P10-P17 Port P1 Input/Output I/O Structure Non-Port Function CMOS compatible input level CMOS 3-state output or N-channel opendrain output Analog comparator power source input pin P20/CMPREF Related SFRs Ref.No. Port control register 1 (1) Port control register 1 Port control register 2 (2) Port P2 P21-P27 (3) CMOS compatible input level CMOS 3-state output PWM output Key-on wake up input Comparator input Port control register 1 AD/DA control register (4) (5) P32-P37 Key-on wake up input Comparator input Port control register 1 (6) P40/XCOUT P41/XCIN Sub-clock generating circuit CPU mode register (7) (8) External interrupt input Interrupt edge selection register Port control register 2 (9) (10) Serial I/O function input Serial I/O control register Port control register 2 (11) Serial I/O function output Serial I/O control register UART control register Port control register 2 (12) Serial I/O function I/O Serial I/O control register Port control register 2 (13) Serial I/O control register Serialized IRQ control register (14) P30/PWM00 P31/PWM10 Port P3 Input/output, individual bits P42/INT0 P43/INT1 P44/RXD Port P4 P45/TXD P46/SCLK P47/SRDY /CLKRUN CMOS compatible input level CMOS 3-state output or N-channel opendrain output Serial I/O function output Serialized IRQ function output 13 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Table 7 I/O port function (2) Pin Name Input/Output P50/INT5 P51/INT20 P52/INT30 P53/INT40 P54/CNTR0 P55/CNTR1 Related SFRs Ref.No. CMOS compatible input level CMOS 3-state output or N-channel opendrain output External interrupt input Interrupt edge selection register (15) (16) Timer X, timer Y function I/O Timer XY mode register (17) D-A converter output PWM output AD/DA control register UART control register (18) (19) A-D converter input AD/DA control register (20) Port control register 2 (21) (22) (23) (24) External interrupt input Interrupt edge selection register Port control register 2 (25) I2C-BUS interface function I/O I2C control register (26) Data bus buffer control register (27) (28) CMOS compatible input level CMOS 3-state output Port P6 P70 P71 P72 P73/INT21 P74/INT31 P75/INT41 Non-Port Function Port P5 P56/DA1/ PWM01 P57/DA2/ PWM11 P60/AN0- P67/AN7 I/O Format Input/output, individual bits Port P7 CMOS compatible input level or TTL input level Pure N-channel open-drain output CMOS compatible input level or SMBUS input level Pure N-channel open-drain output P76/SDA P77/SCL P80/LAD0 P81/LAD1 P82/LAD2 P83/LAD3 P84/ LFRAME P85/ LRESET P86/LCLK P87/ SERIRQ Port P8 CMOS compatible input level CMOS 3-state output LPC interface function I/O Serialized IRQ function I/O Notes1: For details usage of double-function ports as function I/O ports, refer to the applicable sections. 2: Make sure that the input level of each pin should be either 0 V or VCC in STP mode. When an input level is at an intermediate voltage level, the ICC current will become large because of the input buffer gate. 14 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER (1) Ports P0, P1 (2) Port P20 P00-P03, P04-P07, P10-P13, P14-P17 output structure selection bits Direction register Data bus Direction register Port latch Data bus Port latch Comparator reference power source input Comparator reference input pin select bit (4) Ports P30, P31 (3) Port P21-P27 P30-P33 pull-up control bit PWM0 (PWM1) output pin selection bit PWM0(PWM1) enable bit Direction register Data bus Direction register Port latch Data bus Port latch PWM00 (PWM10) output (5) Ports P32-P37 (6) Port P40 P30-P33, P34-P37 pull-up control bit Port XC switch bit Direction register Data bus Direction register Data bus Comparator input Key-on wake-up input Port latch Port latch Sub-clock oscillation circuit Port P41 Port XC switch bit Comparator input Key-on wake-up input (7) Port P41 (8) Ports P42 , P43 Port XC switch bit P4 output structure selection bit Direction register Data bus Direction register Port latch Data bus Sub-clock oscillation circuit Port latch 1 Interrupt input 1. Reading the port P8 register (address 001016) is switched to port P4 pin input level by the P8 function selection bit of the port control register 2 (PCTL2). Fig. 10 Port block diagram (1) 15 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER (9) Port P44 (10) Port P45 P4 output structure selection bit Serial I/O enable bit Receive enable bit P45/TXD P-channel output disable bit Serial I/O enable bit Transmit enable bit Direction register Direction register Data bus Port latch Port latch Data bus 1 1 Serial I/O output Serial I/O input (11) Port P46 (12) Port P47 P4 output structure selection bit Serial I/O mode selection bit Serial I/O enable bit Serialized IRQ enable bit Serial I/O mode selection bit Serial I/O synchronous clock selection bit Serial I/O enable bit SRDY output enable bit Serial I/O enable bit Direction register Direction register Data bus Port latch Port latch Data bus Serial I/O ready output 1 CLKRUN output Serial I/O clock output Serial I/O external clock input (14) Ports P54, P55 (13) Ports P50 to P53 P5i open drain selection bit Direction register Data bus Port latch Data bus Direction register Interrupt input Port latch Pulse output mode Timer output CNTR0, CNTR1 interrupt input (15) Ports P56, P57 (16) Port P6 PWM0 (PWM1) output pin selection bit PWM0 (PWM1) enable bit Direction register Direction register Data bus Port latch Data bus Port latch A-D converter input Analog input pin selection bit PWM01 (PWM11) output D-A converter output D-A1 (D-A2) output enable bit 1. Reading the port P8 register (address 001016) is switched to port P4 pin input level by the P8 function selection bit of the port control register 2 (PCTL2). Fig. 11 Port block diagram (2) 16 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER (17) Ports P70 to P72 (18) Ports P73 to P75 Direction register Direction register Port latch Data bus Data bus Port latch 2 2 (20) Port P77 (19) Port P76 I2C-BUS interface enable bit I2C-BUS interface enable bit Direction register Direction register Data bus Data bus Port latch Port latch SCL output SDA output SDA input SCL input 3 (21) Ports P80 to P83 (22) Ports P84 to P86 LPC enable bit LPC enable bit Direction register Data bus Interrupt input 3 Direction register Data bus Port latch LAD [3 : 0] Port latch LRESET LCLK LFRAME (23) Port P87 SIRQ enable bit Direction register Data bus Port latch IRQSER 2. The input level can be switched between CMOS compatible input level and TTL level by the P7 input level selection bit of the port control register 2 (PCTL2). Reading the port P8 direction register is switched to port P7 pin input level by the P8 function selection bit of the port control register 2 (PCTL2). 3. The input level can be switched between CMOS compatible input level and SMBUS level by the I2C-BUS interface pin input selection bit of the I2C control register (SID). Fig. 12 Port block diagram (3) 17 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER b7 b0 Port control register 1 (PCTL1: address 002E16) P00-P03 output structure selection bit 0: CMOS 1: N-channel open-drain P04-P07 output structure selection bit 0: CMOS 1: N-channel open-drain P10-P13 output structure selection bit 0: CMOS 1: N-channel open-drain P14-P17 output structure selection bit 0: CMOS 1: N-channel open-drain P30-P33 pull-up control bit 0: No pull-up 1: Pull-up P34-P37 pull-up control bit 0: No pull-up 1: Pull-up PWM0 enable bit 0: PWM0 output disabled 1: PWM0 output enabled PWM1 enable bit 0: PWM1 output disabled 1: PWM1 output enabled b7 b0 Port control register 2 (PCTL2: address 002F16) Not used (returns "0" when read) P7 input level selection bit (P70-P75) 0: CMOS input level 1: TTL input level P4 output structure selection bit (P42, P43, P44, P46) 0: CMOS 1: N-channel open-drain P8 function selection bit 0: Port P8/Port P8 direction register 1: Port P4 input register/Port P7 input register INT2, INT3, INT4 interrupt switch bit 0: INT20, INT30, INT40 interrupt 1: INT21, INT31, INT41 interrupt Timer Y count source selection bit 0: f(XIN)/16 (f(XCIN)/16 in low-speed mode) 1: f(XCIN) Oscillation stabilizing time set after STP instruction released bit 0: Automatic set "0116" to timer 1 and "FF16" to prescaler 12 1: No automatic set Comparator reference input selection bit 0: P20/CMPREF input 1: Reference input fixed Fig. 13 Structure of port I/O related registers (1) 18 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER b7 b0 Port P5 input register (P5I: address 0FF816) P50 input level bit P51 input level bit P52 input level bit P53 input level bit These bits directly show the pin input levels. 0: "L" level input 1: "H" level input Not used (returns "0" when read) b7 b0 Port control register 3 (PCTL3: address 0FF916) P50 open drain selection bit P51 open drain selection bit P52 open drain selection bit P53 open drain selection bit 0: CMOS 1: N-channel open drain Not used (returns "0" when read) Fig. 14 Structure of port I/O related registers (2) 19 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER INTERRUPTS Interrupt Source Selection Interrupts occur by 16 sources among 22 sources: thirteen external, nine internal, and one software. Any of the following interrupt sources can be selected by the interrupt source selection register (INTSEL). 1. INT0 or Input buffer full 2. INT1 or Output buffer empty 3. Serial I/O receive or LRESET 4. Serial I/O transmission or SCLSDA 5. Timer 2 or INT5 6. CNTR0 or INT0 7. CNTR1 or INT1 8. A-D conversion or Key-on wake-up Interrupt Control Each interrupt is controlled by an interrupt request bit, an interrupt enable bit, and the interrupt disable flag except for the software interrupt caused by the BRK instruction. An interrupt occurs when both the corresponding interrupt request bit and interrupt enable bit are "1" and the interrupt disable flag is "0". Interrupt enable bits can be set or cleared by software. Interrupt request bits can be cleared by software, but cannot be set by software. The BRK instruction interrupt cannot be disabled with any flag or bit. The I (interrupt disable) flag disables all interrupts except the BRK instruction interrupt. When several interrupts occur at the same time, the interrupts are serviced according to the priority. External Interrupt Pin Selection The external interrupt sources of INT2, INT3, and INT4 can be selected from either input pin from INT20, INT30, INT40 or input pin from INT21, INT31, INT41 by the INT2, INT3, INT4 interrupt switch bit (bit 4 of PCTL2). Notes Interrupt Operation By acceptance of an interrupt, the following operations are automatically performed: 1. The contents of the program counter and the processor status register are automatically pushed onto the stack. 2. The interrupt disable flag is set and the corresponding interrupt request bit is cleared. 3. The interrupt jump destination address is read from the vector table and stored into the program counter. When setting the followings, the interrupt request bit may be set to "1". *When setting external interrupt active edge Related register: Interrupt edge selection register (address 003A 16); Timer XY mode register (address 002316) *When switching interrupt sources of an interrupt vector address where two or more interrupt sources are allocated Related register: Interrupt source selection register (address 003916) *When setting input pin of external interrupts INT2, INT3 and INT4 Related register: INT2, INT3, INT4 interrupt switch bit of Port control register 2 (bit 4 of address 002F16) When not requiring the interrupt occurrence synchronized with these setting, take the following sequence. Set the corresponding interrupt enable bit to "0" (disabled). Set the active edge selection bit or the interrupt source selection bit to "1". Set the corresponding interrupt request bit to "0" after 1 or more instructions have been executed. Set the corresponding interrupt enable bit to "1" (enabled). 20 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Table 8 Interrupt vector addresses and priority Interrupt Source Reset (Note 2) Priority 1 Vector Addresses (Note 1) High Low FFFD16 FFFC16 INT0 2 FFFB16 FFFA16 Interrupt Request Generating Conditions At reset Non-maskable At detection of either rising or falling edge of INT0 input External interrupt (active edge selectable) Input buffer full (IBF) At input data bus buffer writing INT1 At detection of either rising or falling edge of INT1 input Output buffer empty (OBE) Serial I/O reception 3 4 FFF916 FFF716 FFF816 FFF616 LRESET Serial I/O transmission 5 FFF516 FFF416 6 7 8 FFF316 FFF116 FFEF16 FFF216 FFF016 FFEE16 9 FFED16 FFEC16 10 FFEB16 FFEA16 11 FFE916 FFE816 SCL, SDA Timer X Timer Y Timer 1 Timer 2 INT5 CNTR0 INT0 CNTR1 INT1 I 2C 12 FFE716 FFE616 INT2 13 FFE516 FFE416 INT3 14 FFE316 FFE216 INT4 15 FFE116 FFE016 16 FFDF16 FFDE16 External interrupt (active edge selectable) At output data bus buffer reading At completion of serial I/O data reception At falling edge of LRESET input At completion of serial I/ Otransfer shift or when transmission buffer is empty At detection of either rising or falling edge of SCL or SDA At timer X underflow Valid when serial I/O is selected External interrupt Valid when serial I/O is selected External interrupt (active edge selectable) At timer Y underflow At timer 1 underflow At timer 2 underflow At detection of either rising or falling edge of INT5 input At detection of either rising or falling edge of CNTR0 input At detection of either rising or falling edge of INT0 input At detection of either rising or falling edge of CNTR1 input At detection of either rising or falling edge of INT1 input STP release timer underflow External interrupt (active edge selectable) External interrupt (active edge selectable) External interrupt (active edge selectable) External interrupt (active edge selectable) External interrupt (falling valid) At completion of data transfer At detection of either rising or falling edge of INT2 input External interrupt (active edge selectable) At detection of either rising or falling edge of INT3 input At detection of either rising or falling edge of INT4 input External interrupt (active edge selectable) External interrupt (active edge selectable) At completion of A-D conversion A-D converter Key-on wake-up BRK instruction Remarks 17 FFDD16 FFDC16 At falling of port P3 (at input) input logical level AND External interrupt (falling valid) At BRK instruction execution Non-maskable software interrupt Notes 1: Vector addresses contain interrupt jump destination addresses. 2: Reset functions in the same way as an interrupt with the highest priority. 21 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Interrupt request bit Interrupt enable bit Interrupt disable flag (I) BRK instruction Reset Interrupt request Fig. 15 Interrupt control b7 b0 Interrupt edge selection register (INTEDGE : address 003A16) INT0 active edge selection bit INT1 active edge selection bit Not used (returns "0" when read) INT2 active edge selection bit INT3 active edge selection bit INT4 active edge selection bit INT5 active edge selection bit Not used (returns "0" when read) b7 b0 0 : Falling edge active 1 : Rising edge active Interrupt request register 1 (IREQ1 : address 003C16) b7 INT0/input buffer full interrupt request bit INT1/output buffer empty interrupt request bit Serial I/O receive interrupt/LRESET request bit Serial I/O transmit/SCL, SDA interrupt request bit Timer X interrupt request bit Timer Y interrupt request bit Timer 1 interrupt request bit Timer 2/INT5 interrupt request bit b7 b0 Interrupt control register 1 (ICON1 : address 003E16) INT0/input buffer full interrupt enable bit INT1/output buffer empty interrupt enable bit Serial I/O receive interrupt/LRESET enable bit Serial I/O transmit/SCL, SDA interrupt enable bit Timer X interrupt enable bit Timer Y interrupt enable bit Timer 1 interrupt enable bit Timer 2/INT5 interrupt enable bit b0 Interrupt request register 2 (IREQ2 : address 003D16) CNTR0/INT0 interrupt request bit CNTR1/INT1 interrupt request bit I2C interrupt request bit INT2 interrupt request bit INT3 interrupt request bit INT4 interrupt request bit AD converter/key-on wake-up interrupt request bit Not used (returns "0" when read) 0 : No interrupt request issued 1 : Interrupt request issued b7 0 b0 Interrupt control register 2 (ICON2 : address 003F16) CNTR0/INT0 interrupt enable bit CNTR1/INT1 interrupt enable bit I2C interrupt enable bit INT2 interrupt enable bit INT3 interrupt enable bit INT4 interrupt enable bit AD converter/key-on wake-up interrupt enable bit Not used (returns "0" when read) (Do not write "1" to this bit) 0 : Interrupts disabled 1 : Interrupts enabled Fig. 16 Structure of interrupt-related registers (1) 22 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER b7 b0 Interrupt source selection register (INTSEL: address 003916) INT0/input buffer full interrupt source selection bit 0 : INT0 interrupt 1 : Input buffer full interrupt INT1/output buffer empty interrupt source selection bit 0 : INT1 interrupt 1 : Output buffer empty interrupt Serial I/O receive/LRESET interrupt source selection bit 0 : Serial I/O receive 1 : LRESET interrupt Serial I/O transmit/SCL, SDA interrupt source selection bit 0 : Serial I/O transmit interrupt 1 : SCL, SDA interrupt Timer 2/INT5 interrupt source selection bit 0 : Timer 2 interrupt 1 : INT5 interrupt CNTR0/INT0 interrupt source selection bit 0 : CNTR0 interrupt 1 : INT0 interrupt CNTR1/INT1 interrupt source selection bit 0 : CNTR1 interrupt 1 : INT1 interrupt AD converter/key-on wake-up interrupt source selection bit 0 : A-D converter interrupt 1 : Key-on wake-up interrupt Fig. 17 Structure of interrupt-related registers (2) 23 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Key Input Interrupt (Key-on Wake Up) A Key input interrupt request is generated by applying "L" level to any pin of port P3 that have been set to input mode. In other words, it is generated when the logical AND of all port P3 input goes from "1" to "0". An example of using a key input interrupt is shown in Figure 18, where an interrupt request is generated by pressing one of the keys consisted as an active-low key matrix which inputs to ports P30-P33. Port PXx "L" level output Port control register 1 Bit 5 = "0" Port P37 direction register = "1" Key input interrupt request Port P37 latch P37 output Port P36 direction register = "1" Port P36 latch P36 output Port P35 direction register = "1" Port P35 latch P35 output Port P34 direction register = "1" Port P34 latch P34 output P33 input Port control register 1 Bit 4 = "1" Port P33 latch Port P32 latch Port P31 direction register = "0" P31 input P30 input Port P3 input circuit Comparator circuit Port P32 direction register = "0" P32 input Port P33 direction register = "0" Port P31 latch Port P30 direction register = "0" Port P30 latch P-channel transistor for pull-up CMOS output buffer Fig. 18 Connection example when using key input interrupt and port P3 block diagram 24 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER TIMERS Timer 1 and Timer 2 The 3885 group has four timers: timer X, timer Y, timer 1, and timer 2. The division ratio of each timer or prescaler is given by 1/(n + 1), where n is the value in the corresponding timer or prescaler latch. All timers are count down structure. When the timer reaches "0016", an underflow occurs at the next count pulse and the corresponding timer latch is reloaded into the timer and the count is continued. When a timer underflows, the interrupt request bit corresponding to that timer is set to "1". The count source of prescaler 12 is the oscillation frequency divided by 16. The output of prescaler 12 is counted by timer 1 and timer 2, and a timer underflow sets the interrupt request bit. Timer X and Timer Y Timer X and Timer Y can each select one of four operating modes by setting the timer XY mode register. (1) Timer Mode The timer counts f(XIN)/16. (2) Pulse Output Mode b7 b0 Timer XY mode register (TM : address 002316) Timer X operating mode bit b1b0 0 0 : Timer mode 0 1 : Pulse output mode 1 0 : Event counter mode 1 1 : Pulse width measurement mode CNTR0 active edge selection bit 0: Interrupt at falling edge Count at rising edge in event counter mode 1: Interrupt at rising edge Count at falling edge in event counter mode Timer X count stop bit 0: Count start 1: Count stop Timer Y operating mode bit b5b4 0 0 : Timer mode 0 1 : Pulse output mode 1 0 : Event counter mode 1 1 : Pulse width measurement mode CNTR1 active edge selection bit 0: Interrupt at falling edge Count at rising edge in event counter mode 1: Interrupt at rising edge Count at falling edge in event counter mode Timer Y count stop bit 0: Count start 1: Count stop Fig. 19 Structure of timer XY mode register Timer X (or timer Y) counts f(XIN)/16. Whenever the contents of the timer reach "00 16 ", the signal output from the CNTR 0 (or CNTR1) pin is inverted. If the CNTR0 (or CNTR1) active edge selection bit is "0", output begins at " H". If it is "1", output starts at "L". When using a timer in this mode, set the corresponding port P54 ( or port P55) direction register to output mode. (3) Event Counter Mode Operation in event counter mode is the same as in timer mode, except that the timer counts signals input through the CNTR0 or CNTR1 pin. When the CNTR0 (or CNTR1) active edge selection bit is "0", the rising edge of the CNTR0 (or CNTR1) pin is counted. When the CNTR0 (or CNTR1) active edge selection bit is "1", the falling edge of the CNTR0 (or CNTR1) pin is counted. (4) Pulse Width Measurement Mode If the CNTR0 (or CNTR1) active edge selection bit is "0", the timer counts f(XIN)/16 while the CNTR0 (or CNTR1) pin is at "H". If the CNTR 0 (or CNTR 1 ) active edge selection bit is "1", the timer counts while the CNTR0 (or CNTR1) pin is at "L". The count can be stopped by setting "1" to the timer X (or timer Y) count stop bit in any mode. The corresponding interrupt request bit is set each time a timer overflows. The count source for timer Y in the timer mode or the pulse output mode can be selected from either f(XIN)/16 or f(XCIN) by the timer Y count source selection bit of the port control register 2 (bit 5 of PCTL2). 25 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Data bus Divider Oscillator f(XIN) Prescaler X latch (8) 1/16 Pulse width measurement mode (f(XCIN) in low-speed mode) Timer mode Pulse output mode Prescaler X (8) CNTR0 active edge selection bit "0" P54/CNTR0 Event counter mode Timer X (8) To timer X interrupt request bit Timer X count stop bit To CNTR0 interrupt request bit "1" CNTR0 active edge selection "1" bit "0 " Q Toggle flip-flop T Q R Timer X latch write pulse Pulse output mode Port P54 latch Port P54 direction register Timer X latch (8) Pulse output mode Data bus Oscillator Divider f(XIN) Timer Y count source selection bit "0 " 1/16 (f(XCIN) in low-speed mode) Prescaler Y latch (8) Oscillator "1" f(XCIN) Prescaler Y (8) CNTR1 active edge selection bit "0" P55/CNTR1 "1 " Event counter mode Port P55 direction register Timer Y (8) To timer Y interrupt request bit Timer Y count stop bit To CNTR1 interrupt request bit CNTR1 active edge selection "1" bit Q Toggle flip-flop T Q Port P55 latch Timer Y latch (8) Pulse width measureTimer mode ment mode Pulse output mode "0" R Timer Y latch write pulse Pulse output mode Pulse output mode Data bus Prescaler 12 latch (8) Oscillator f(XIN) Timer 1 latch (8) Timer 2 latch (8) Timer 1 (8) Timer 2 (8) Divider 1/16 Prescaler 12 (8) To timer 2 interrupt request bit (f(XCIN) in low-speed mode) To timer 1 interrupt request bit Fig. 20 Block diagram of timer X, timer Y, timer 1, and timer 2 26 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER WATCHDOG TIMER Watchdog timer H count source selection bit operation Bit 7 of WDTCON permits selecting a watchdog timer H count source. When this bit is set to "0", the count source becomes the underflow signal of watchdog timer L. The detection time is set to 131.072 ms at f(XIN)=8 MHz and 32.768 s at f(XCIN)=32 kHz . When this bit is set to "1", the count source becomes the signal divided by 16 for f(XIN) (or f(XCIN) in low speed mode). The detection time in this case is set to 512 s at f(XIN)=8 MHz and 128 ms at f(XCIN)=32 kHz . This bit is cleared to "0" after resetting. The watchdog timer gives a mean of returning to the reset status when a program cannot run on a normal loop (for example, because of a software run-away). The watchdog timer consists of an 8-bit watchdog timer L and an 8-bit watchdog timer H. Basic Operation of Watchdog Timer When any data is not written into the watchdog timer control register (WDTCON) after resetting, the watchdog timer is in the stop state. The watchdog timer starts to count down by writing an optional value into the watchdog timer control register (WDTCON) and an internal reset occurs at an underflow of the watchdog timer H. Accordingly, programming is usually performed so that writing to the watchdog timer control register (WDTCON) may be started before an underflow. When the watchdog timer control register (WDTCON) is read, the values of the high-order 6 bits of the watchdog timer H, STP instruction disable bit, and watchdog timer H count source selection bit are read. STP instruction disable bit Bit 6 of WDTCON permits disabling the STP instruction when the watchdog timer is in operation. When this bit is "0", the STP instruction is enabled. When this bit is "1", the STP instruction is disabled. When this bit is "1", the STP instruction execution cause an internal reset. When this bit is set to "1", it cannot be rewritten to "0" by program. This bit is cleared to "0" after resetting. Initial Value of Watchdog Timer At reset or writing to the watchdog timer control register (WDTCON), each watchdog timer H and L is set to "FF16". XCIN "10" Main clock division ratio selection bits (Note) XIN "FF16" is set when watchdog timer control register is written to. Data bus "FF16" is set when watchdog timer control register is written to. "0" Watchdog timer L (8) 1/16 "1" "00" "01" Watchdog timer H (8) Watchdog timer H count source selection bit STP instruction disable bit STP instruction Reset circuit RESET Internal reset Note: Either high-speed, middle-speed or low-speed mode is selected by bits 7 and 6 of the CPU mode register. Fig. 21 Block diagram of Watchdog timer b7 b0 Watchdog timer control register (WDTCON : address 001E16) Watchdog timer H (for read-out of high-order 6 bit) STP instruction disable bit 0: STP instruction enabled 1: STP instruction disabled Watchdog timer H count source selection bit 0: Watchdog timer L underflow 1: f(XIN)/16 or f(XCIN)/16 Fig. 22 Structure of Watchdog timer control register 27 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER PULSE WIDTH MODULATION (PWM) OUTPUT CIRCUIT The 3885 group has two PWM output circuits, PWM0 and PWM1, with 14-bit resolution respectively. These can operate independently. When the oscillation frequency XIN is 8 MHz, the minimum resolution bit width is 250 ns and the cycle period is 4096 s. The PWM timing generator supplies a PWM control signal based on a signal that is the frequency of the XIN clock. The following explanation assumes f(XIN) = 8 MHz. Data Bus Set to "1" at write PWM0L register (Address 003116) bit 5 bit 7 bit 0 bit 0 bit 7 PWM0H register (Address 003016) PWM0 latch (14 bits) LSB MSB 14 P30 latch P30/PWM00 PWM0 14-bit PWM0 circuit PWM0 enable bit f(XIN) (8MHz) 1/2 (4MHz) PWM0 timing generator PWM0 output selection bit PWM0 enable bit (64 s period) (4096 s period) P30 direction register P56 latch P56/DA1/PWM01 PWM0 enable bit PWM0 output selection bit PWM0 enable bit P56 direction register Fig. 23 PWM block diagram (PWM0) 28 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Data Setup (PWM0) this "H" duration by the contents of the low-order 6-bit data according to the rule in Table 9. That is, only in the sub-period tm shown by Table 9 in the PWM cycle period T = 64t, its "H" duration is lengthened to the minimum resolution added to the length of other periods. The PWM0 output pin also functions as port P30 or P5 6 . The PWM0 output pin is selected from either P3 0 /PWM 00 or P56/PWM01 by PWM0 output pin selection bit (bit 4 of ADCON). The PWM0 output becomes enabled state by setting PWM0 enable bit (bit 6 of PCTL1). The high-order eight bits of output data are set in the PWM0H register and the low-order six bits are set in the PWM0L register. PWM1 is set as the same way. For example, if the high-order eight bits of the 14-bit data are 0316 and the low-order six bits are 0516, the length of the "H"-level output in sub-periods t8, t24, t32, t40, and t56 is 4 , and its length is 3 in all other sub-periods. Time at the "H" level of each sub-period almost becomes equal, because the time becomes length set in the high-order 8 bits or becomes the value plus , and this sub-period t (= 64 s, approximate 15.6 kHz) becomes cycle period approximately. PWM Operation The 14-bit PWM data is divided into the low-order six bits and the high-order eight bits in the PWM latch. The high-order eight bits of data determine how long an "H"-level signal is output during each sub-period. There are 64 sub-periods in each period, and each sub-period is 256 (64 s) long. The signal is "H" for a length equal to N times , where is the minimum resolution (250 ns). "H" or "L" of the bit in the ADD part shown in Figure 24 is added to Transfer From Register to Latch Data written to the PWML register is transferred to the PWM latch at each PWM period (every 4096 s), and data written to the PWMH register is transferred to the PWM latch at each sub-period (every 64 s). The signal which is output to the PWM output pin is corresponding to the contents of this latch. When the PWML register is read, the latch contents are read. However, bit 7 of the PWML register indicates whether the transfer to the PWM latch is completed; the transfer is completed when bit 7 is "0" and it is not done when bit 7 is "1". Table 9 Relationship between low-order 6 bits of data and period set by the ADD bit Low-order 6 bits of data (PWML) 0 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 LSB 0 1 0 0 0 0 0 Sub-periods tm Lengthened (m=0 to 63) None m=32 m=16, 48 m=8, 24, 40, 56 m=4, 12, 20, 28, 36, 44, 52, 60 m=2, 6, 10, 14, 18, 22, 26, 30, 34, 38, 42, 46, 50, 54, 58, 62 m=1, 3, 5, 7, ................................................ ,57, 59, 61, 63 4096 s 64 s 64 s 64 s 64 s m=0 m=7 m=8 m=9 15.75 s 15.75 s 15.75 s 16.0 s 00111111 Pulse width modulation register H : 000101 Pulse width modulation register L : Sub-periods where "H" pulse width is 16.0 s : Sub-periods where "H" pulse width is 15.75 s : 15.75 s 64 s m=63 15.75 s 15.75 s m = 8, 24, 32, 40, 56 m = all other values Fig. 24 PWM timing 29 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Data 6A16 stored at address 003016 PWM0H register 5916 Data 7B16 stored at address 003016 6A16 7B16 Data 2416 stored at address 003116 PWM0L register 1316 Bit 7 cleared after transfer A416 Data 3516 stored at address 003116 2416 3516 Transfer from register to latch PWM0 latch (14bits) 165316 1A9316 Transfer from register to latch B516 1AA416 1AA416 1EE416 1EF516 When bit 7 of PWM0L is 0, transfer from register to latch is disabled. T = 4096 s (64 64 s) t = 64 s Example 1 6A 6B 6A 6B 6A 6B 6A 6B 6A 6B 6B 5 2 5 6B 6A 6B 6A 6B 6A 6B 6A 6B 6A 6B 6A 6B 6A 6B 6A PWM0 output 1 low-order 6-bit output: H L 6A16, 2416 Example 2 5 5 5 5 6B16 ************** 36 times (107) 6A 6A 6A 6A 6B 6A 5 5 5 6A16 ************* 28 times (106) 6B 6A 6B 6A 6A 6A 5 5 5 5 5 106 64 + 36 6B 6A 6B 6A 6B 6A 6A 6A 6B 6A 6B 6A 6B 6A PWM0 output low-order 6-bit output: H L 6A16, 1816 4 6B16 3 ************** 4 4 3 4 6A16 ******* 40 times 24 times 4 3 4 106 64 + 24 t = 64 s (256 0.25 s) Minimum resolution bit width = 0.25 s PWM output 2 6B 6A 69 68 67 ******* 02 01 FF FE FD FC ******* 97 96 ADD 8-bit counter 02 01 00 69 68 67 ******* 02 01 FF FE FD FC ******* 97 96 ADD The ADD portions with additional are determined by PWML. Fig. 25 14-bit PWM timing (PWM0) 30 6A 95 H duration length specified by PWM0H 256 (64 s), fixed ******* 02 01 00 95 ******* 6A MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER (1) Clock Synchronous Serial I/O Mode SERIAL I/O Serial I/O Clock synchronous serial I/O mode can be selected by setting the serial I/O mode selection bit of the serial I/O control register (bit 6 of SIOCON) to "1". For clock synchronous serial I/O, the transmitter and the receiver must use the same clock. When an internal clock is used, the transfer starts by writing to the TB. Serial I/O works as either clock synchronous serial I/O mode or universal asynchronous receiver transmitter (UART) serial I/O mode. A dedicated timer is also provided for baud rate generation. Data bus Receive buffer full flag (RBF) Receive interrupt request (RI) Receive shift register P44/RXD Address 001A16 Serial I/O control register Address 001816 Receive buffer register Shift clock Clock control circuit P46/SCLK f(XIN) Serial I/O synchronous clock selection bit BRG count source selection bit (f(XCIN) in low-speed mode) Baud rate generator 1/4 Address 001C16 Frequency division ratio 1/(n+1) 1/4 P47/SRDY/CLKRUN F/F Clock control circuit Falling-edge detector Transmit shift completion flag (TSC) Shift clock P45/TXD Transmit interrupt source selection bit Transmit interrupt request (TI) Transmit shift register Transmit buffer register Address 001816 Transmit buffer empty flag (TBE) Serial I/O status register Data bus Fig. 26 Block diagram of clock synchronous serial I/O Transfer shift clock (1/2 to 1/2048 of the internal clock, or an external clock) TxD pin D0 D1 D2 D3 D4 D5 D6 D7 RxD pin D0 D1 D2 D3 D4 D5 D6 D7 SRDY pin Write pulse to transmit buffer register (TB) TBE = 0 TSC = 1 TBE = 1 TSC = 0 RBF = 1 TSC = 1 Overrun error (OE) detection Notes 1: As the transmit interrupt (TI), which can be selected, either when the transmit buffer has emptied (TBE=1) or after the transmit shift operation has ended (TSC=1), by setting the transmit interrupt source selection bit (TIC) of the serial I/O control register. 2: If data is written to the transmit buffer register when TSC=0, the transmit clock is generated continuously and the next serial data is output continuously from the TxD pin. 3: The receive interrupt (RI) is set when the receive buffer full flag (RBF) becomes "1" . Fig. 27 Operation of clock synchronous serial I/O function 31 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER (2) Asynchronous Serial I/O (UART) Mode Universal asynchronous transmitter receiver (UART) serial I/O mode can be selected by clearing the serial I/O mode selection bit of the serial I/O control register to "0". Eight serial data transfer formats can be selected, and the transfer formats used by a transmitter and receiver must be identical. Both the transmit and receive shift registers have a buffer, but the two buffers assigned the same address. Since the shift register cannot be written to or read from directly, transmit data is written to the transmit buffer register, and receive data is read from the receive buffer register. The transmit buffer register can also hold the next data to be transmitted, and the receive buffer register can hold a character while the next character is being received. Data bus Address 001816 P44/RXD Serial I/O control register Address 001A16 Receive buffer full flag (RBF) Receive interrupt request (RI) Receive buffer register OE Character length selection bit ST detector 7 bits Receive shift register 1/16 8 bits PE FE SP detector Clock control circuit UART control register Address 001B16 Serial I/O synchronous clock selection bit P46/SCLK f(XIN) (f(XCIN) in low-speed mode) BRG count source selection bit Frequency division ratio 1/(n+1) Baud rate generator 1/4 ST/SP/PA generator 1/16 P45/TXD Transmit shift register Transmit shift completion flag (TSC) Transmit interrupt source selection bit Transmit interrupt request (TI) Character length selection bit Transmit buffer register Data bus Fig. 28 Block diagram of UART mode 32 Transmit buffer empty flag (TBE) Serial I/O status register Address 001916 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Transmit or receive clock Transmit buffer write signal TBE=0 TSC=0 TBE=1 Serial output TXD pin TBE=0 TSC=1 TBE=1 ST D0 D1 SP ST D0 Receive buffer read signal SP D1 1 start bit 7 or 8 data bit 1 or 0 parity bit 1 or 2 stop bit (s) Generated at 2nd bit in 2-stop-bit mode RBF=0 RBF=1 Serial input RXD pin ST D0 D1 SP RBF=1 ST D0 D1 SP Notes 1: Error flag detection occurs at the same time that the RBF flag becomes "1" (at 1st stop bit, during reception). 2: As the transmit interrupt (TI), when either the TBE or TSC flag becomes "1", can be selected to occur depending on the setting of the transmit interrupt source selection bit (TIC) of the serial I/O control register. 3: The receive interrupt (RI) is set when the RBF flag becomes "1". 4: After data is written to the transmit buffer when TSC=1, 0.5 to 1.5 cycles of the data shift cycle is necessary until changing to TSC=0. Fig. 29 Operation of UART mode function [Serial I/O Control Register (SIOCON)] 001A16 The serial I/O control register consists of eight control bits for the serial I/O function. [UART Control Register (UARTCON)] 001B16 The UART control register consists of four control bits (bits 0 to 3) which are valid in UART mode and set the data format of an data transfer. The POFF bit (bit4) is always valid and define the output structure of the P45/TXD pin. [Serial I/O Status Register (SIOSTS)] 001916 The read-only serial I/O status register consists of seven flags (bits 0 to 6) which indicate the operating status of the serial I/O function and various errors. Three of the flags (bits 4 to 6) are valid only in UART mode. The receive buffer full flag (bit 1) is cleared to "0" when the receive buffer register is read. If there is an error, it is detected at the same time that data is transferred from the receive shift register to the receive buffer register, and the receive buffer full flag is set. A write to the serial I/O status register clears all the error flags OE, PE, FE, and SE (bit 3 to bit 6, respectively). Writing "0" to the serial I/O enable bit (SIOE, bit 7 of SIDCON) also clears all the status flags, including the error flags. Bits 0 to 6 of the serial I/O status register are initialized to "0" at reset, but if the transmit enable bit (TE, bit 4 of SIOCON) has been set to "1", the transmit shift completion flag (TSC, bit 2) and the transmit buffer empty flag (TBE, bit 0) become "1". [Transmit Buffer Register/Receive Buffer Register (TB/RB)] 001816 The transmit buffer register and the receive buffer register are located at the same address. The transmit buffer is write-only and the receive buffer is read-only. If a character length is 7 bits, the MSB data stored in the receive buffer is "0". [Baud Rate Generator (BRG)] 001C16 The baud rate generator determines the baud rate for serial transfer. The baud rate generator divides the frequency of the count source by 1/(n + 1), where n is the value written to the baud rate generator. Notes When setting the transmit enable bit to "1", the serial I/O transmit interrupt request bit is automatically set to "1". When not requiring the interrupt occurrence synchronized with the transmission enabled, take the following sequence. Set the serial I/O transmit interrupt enable bit to "0" (disabled). Set the transmit enable bit to "1". Set the serial I/O transmit interrupt request bit to "0" after 1 or more instructions have been executed. Set the serial I/O transmit interrupt enable bit to "1" (enabled). 33 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER b7 b7 b0 b0 Serial I/O status register (SIOSTS : address 001916) b0 Serial I/O control register (SIOCON : address 001A16) Transmit buffer empty flag (TBE) 0: Buffer full 1: Buffer empty BRG count source selection bit (CSS) 0: f(XIN) (f(XCIN) in low-speed mode) 1: f(XIN)/4 (f(XCIN)/4 in low-speed mode) Receive buffer full flag (RBF) 0: Buffer empty 1: Buffer full Transmit shift completion flag (TSC) 0: Transmit shift in progress 1: Transmit shift completed Serial I/O synchronous clock selection bit (SCS) 0: BRG output divided by 4 when clock synchronous serial I/O is selected, BRG output divided by 16 when UART is selected. 1: External clock input when clock synchronous serial I/O is selected, external clock input divided by 16 when UART is selected. Overrun error flag (OE) 0: No error 1: Overrun error SRDY output enable bit (SRDY) 0: P47 pin operates as ordinary I/O pin 1: P47 pin operates as SRDY output pin Parity error flag (PE) 0: No error 1: Parity error Transmit interrupt source selection bit (TIC) 0: Interrupt when transmit buffer has emptied 1: Interrupt when transmit shift operation is completed Framing error flag (FE) 0: No error 1: Framing error Transmit enable bit (TE) 0: Transmit disabled 1: Transmit enabled Summing error flag (SE) 0: (OE) U (PE) U (FE)=0 1: (OE) U (PE) U (FE)=1 Receive enable bit (RE) 0: Receive disabled 1: Receive enabled Not used (returns "1" when read) Serial I/O mode selection bit (SIOM) 0: Clock asynchronous (UART) serial I/O 1: Clock synchronous serial I/O UART control register (UARTCON : address 001B16) Character length selection bit (CHAS) 0: 8 bits 1: 7 bits Parity enable bit (PARE) 0: Parity checking disabled 1: Parity checking enabled Parity selection bit (PARS) 0: Even parity 1: Odd parity Stop bit length selection bit (STPS) 0: 1 stop bit 1: 2 stop bits P45/TXD P-channel output disable bit (POFF) 0: CMOS output (in output mode) 1: N-channel open drain output (in output mode) Not used (return "1" when read) Fig. 30 Structure of serial I/O control registers 34 b7 Serial I/O enable bit (SIOE) 0: Serial I/O disabled (pins P44 to P47 operate as ordinary I/O pins) 1: Serial I/O enabled (pins P44 to P47 operate as serial I/O pins) MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER MULTI-MASTER I2C-BUS INTERFACE Table 10 Multi-master I2C-BUS interface functions The multi-master I2C-BUS interface is a serial communications circuit, conforming to the Philips I2C-BUS data transfer format. This interface, offering both arbitration lost detection and a synchronous functions, is useful for the multi-master serial communications. Figure 31 shows a block diagram of the multi-master I2C-BUS interface and Table 10 lists the multi-master I 2 C-BUS interface functions. This multi-master I2C-BUS interface consists of the I2C address register, the I 2C data shift register, the I2C clock control register, the I2C control register, the I2C status register, the I2C start/stop condition control register and other control circuits. When using the multi-master I2 C-BUS interface, set 1 MHz or more to system clock . b7 Interrupt generating circuit Interrupt request signal (SCLSDAIRQ) Item Format Communication mode SCL clock frequency Function In conformity with Philips I2C-BUS standard: 10-bit addressing format 7-bit addressing format High-speed clock mode Standard clock mode In conformity with Philips I2C-BUS standard: Master transmission Master reception Slave transmission Slave reception 16.1 kHz to 400 kHz (at = 4 MHz) System clock = f(XIN)/2 (high-speed mode) = f(XIN)/8 (middle-speed mode) I2C address register SAD6 SAD5 SAD4 SAD3 SAD2 SAD1 SAD0 b0 Interrupt generating circuit RWB S0D Interrupt request signal (I2CIRQ) Address comparator Serial data (SDA) Noise elimination circuit Data control circuit b0 b7 I2C data shift register b7 b0 S0 AL AAS AD0 LRB MST TRX BB PIN S2D STSP SIS SIP SSC4SSC3 SSC2 SSC1 SSC0 SEL AL circuit I2C status register S1 I2C start/stop condition control register Internal data bus BB circuit Serial clock (SCL) Noise elimination circuit Clock control circuit b7 b0 FAST ACK ACK MODE CCR4 CCR3 CCR2 CCR1 CCR0 BIT I2C clock control register S1D b0 b7 TISS CLK STP 10BIT SAD ALS ES0 BC2 BC1 BC0 S2 I2C clock control register Clock division Stop selection System clock () Bit counter Fig. 31 Block diagram of multi-master I2C-BUS interface : Purchase of MITSUBISHI ELECTRIC CORPORATIONS I2C components conveys a license under the Philips I2C Patent Rights to use these components an I2C system, provided that the system conforms to the I2C Standard Specification as defined by Philips. 35 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER [I2C Data Shift Register (S0)] 001216 The I2C data shift register (S0) is an 8-bit shift register to store receive data and write transmit data. When transmit data is written into this register, it is transferred to the outside from bit 7 in synchronization with the SCL clock, and each time one-bit data is output, the data of this register are shifted by one bit to the left. When data is received, it is input to this register from bit 0 in synchronization with the SCL clock, and each time one-bit data is input, the data of this register are shifted by one bit to the left. The minimum 2 cycles of are required from the rising of the SCL clock until input to this register. The I2C data shift register is in a write enable status only when the I2C-BUS interface enable bit (ES0 bit : bit 3 S1D) of the I2C control register is "1". The bit counter is reset by a write instruction to the I2C data shift register. When both the ES0 bit and the MST bit of the I2C status register (S1) are "1", the SCL is output by a write instruction to the I2C data shift register. Reading data from the I2C data shift register is always enabled regardless of the ES0 bit value. [I2C Address Register (S0D)] 001316 The I2C address register (S0D) consists of a 7-bit slave address and _______ a read/write bit. In the addressing mode, the slave address written in this register is compared with the address data to be received immediately after the START condition is detected. _________ *Bit 0: Read/write bit (RWB) This is not used in the 7-bit addressing mode. In the 10-bit addressing mode, the first address data to be received is compared with the contents (SAD6 to SAD0 + RWB) of the I2C address register. The RWB bit is cleared to "0" automatically when the stop condition is detected. *Bits 1 to 7: Slave address (SAD0-SAD6) These bits store slave addresses. Regardless of the 7-bit addressing mode and the 10-bit addressing mode, the address data transmitted from the master is compared these bits. 36 b7 b0 SAD6 SAD5 SAD4 SAD3 SAD2 SAD1 SAD0 RWB I2C address register (S0D: address 001316) Read/write bit Slave address Fig. 32 Structure of I2C address register MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER [I2C Clock Control Register (S2)] 001616 I 2C Note: Do not write data into the clock control register during transfer. If data is written during transfer, the I2C clock generator is reset, so that data cannot be transferred normally. I2C clock control register (S2 : address 001616) SCL frequency control bits Refer to Table 11. SCL mode specification bit 0 : Standard clock mode 1 : High-speed clock mode ACK bit 0 : ACK is returned. 1 : ACK is not returned. ACK clock bit 0 : No ACK clock 1 : ACK clock Fig. 33 Structure of I2C clock control register Table 11 Set values of I2 C clock control register and S CL frequency Setting value of CCR4-CCR0 CCR4 CCR3 CCR2 CCR1 CCR0 SCL frequency (at = 4 MHz, unit : kHz) (Note 1) Standard clock High-speed clock mode mode 0 0 0 Setting disabled Setting disabled 0 0 0 1 Setting disabled Setting disabled 0 0 0 1 0 Setting disabled Setting disabled 0 0 0 1 1 - (Note 2) 333 0 0 1 0 0 - (Note 2) 250 0 0 1 0 1 100 400 (Note 3) 0 0 1 1 0 83.3 166 1000/CCR value (Note 3) ... 0 0 ... 0 ... *Bit 7: ACK clock bit (ACK) This bit specifies the mode of acknowledgment which is an acknowledgment response of data transfer. When this bit is set to "0", the no ACK clock mode is selected. In this case, no ACK clock occurs after data transmission. When the bit is set to "1", the ACK clock mode is selected and the master generates an ACK clock each completion of each 1-byte data transfer. The device for transmitting address data and control data releases the SDA at the occurrence of an ACK clock (makes S DA "H") and receives the ACK bit generated by the data receiving device. b0 ACK FAST BIT MODE CCR4 CCR3 CCR2 CCR1 CCR0 ... ACK clock: Clock for acknowledgment b7 ACK ... The I2C clock control register (S2) is used to set ACK control, SCL mode and SCL frequency. *Bits 0 to 4: SCL frequency control bits (CCR0-CCR4) These bits control the SCL frequency. Refer to Table 11. *Bit 5: SCL mode specification bit (FAST MODE) This bit specifies the SCL mode. When this bit is set to "0", the standard clock mode is selected. When the bit is set to "1", the high-speed clock mode is selected. When connecting the bus of the high-speed mode I2C bus standard (maximum 400 kbits/s), use 8 MHz or more oscillation frequency f(XIN) and high-speed mode (2 division main clock). *Bit 6: ACK bit (ACK BIT) This bit sets the SDA status when an ACK clock is generated. When this bit is set to "0", the ACK return mode is selected and SDA goes to "L" at the occurrence of an ACK clock. When the bit is set to "1", the ACK non-return mode is selected. The SDA is held in the "H" status at the occurrence of an ACK clock. However, when the slave address matches with the address data in the reception of address data at ACK BIT = "0", the SDA is automatically made "L" (ACK is returned). If there is a unmatch between the slave address and the address data, the SDA is automatically made "H" (ACK is not returned). 500/CCR value (Note 3) 1 1 1 0 1 17.2 34.5 1 1 1 1 0 16.6 33.3 1 1 1 1 1 16.1 32.3 Notes 1: Duty of SCL clock output is 50 %. The duty becomes 35 to 45 % only when the high-speed clock mode is selected and CCR value = 5 (400 kHz, at = 4 MHz). "H" duration of the clock fluctuates from -4 to +2 cycles of in the standard clock mode, and fluctuates from -2 to +2 cycles of in the high-speed clock mode. In the case of negative fluctuation, the frequency does not increase because "L" duration is extended instead of "H" duration reduction. These are value when SCL clock synchronization by the synchronous function is not performed. CCR value is the decimal notation value of the SCL frequency control bits CCR4 to CCR0. 2: Each value of SCL frequency exceeds the limit at = 4 MHz or more. When using these setting value, use of 4 MHz or less. 3: The data formula of SCL frequency is described below: /(8 CCR value) Standard clock mode /(4 CCR value) High-speed clock mode (CCR value 5) /(2 CCR value) High-speed clock mode (CCR value = 5) Do not set 0 to 2 as CCR value regardless of frequency. Set 100 kHz (max.) in the standard clock mode and 400 kHz (max.) in the high-speed clock mode to the SCL frequency by setting the SCL frequency control bits CCR4 to CCR0. 37 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER [I2C Control Register (S1D)] 001516 The I2C control register (S1D) controls data communication format. *Bits 0 to 2: Bit counter (BC0-BC2) These bits decide the number of bits for the next 1-byte data to be transmitted. The I2C interrupt request signal occurs immediately after the number of count specified with these bits (ACK clock is added to the number of count when ACK clock is selected by ACK bit (bit 7 of S2)) have been transferred, and BC0 to BC2 are returned to "0002". Also when a START condition is received, these bits become "0002" and the address data is always transmitted and received in 8 bits. *Bit 3: I2C interface enable bit (ES0) This bit enables to use the multi-master I2C BUS interface. When this bit is set to "0", the use disable status is provided, so that the SDA and the SCL become high-impedance. When the bit is set to "1", use of the interface is enabled. When ES0 = "0", the following is performed. * PIN = "1", BB = "0" and AL = "0" are set (which are bits of the I2C status register at S1 ). * Writing data to the I2C data shift register (S0) is disabled. *Bit 4: Data format selection bit (ALS) This bit decides whether or not to recognize slave addresses. When this bit is set to "0", the addressing format is selected, so that address data is recognized. When a match is found between a slave address and address data as a result of comparison or when a general call (refer to "I 2C Status Register", bit 1) is received, transfer processing can be performed. When this bit is set to "1", the free data format is selected, so that slave addresses are not recognized. *Bit 5: Addressing format selection bit (10BIT SAD) This bit selects a slave address specification format. When this bit is set to "0", the 7-bit addressing format is selected. In this case, only the high-order 7 bits (slave address) of the I2C address register (S0D) are compared with address data. When this bit is set to "1", the 10-bit addressing format is selected, and all the bits of the I2C address register are compared with address data. *Bit 6: System clock stop selection bit (CLKSTP) When executing the WIT or STP instruction, this bit selects the condition of system clock provided to the multi-master I2C-BUS interface. When this bit is set to "0", system clock and operation of the multi-master I2C-BUS interface stop by executing the WIT or STP instruction. When this bit is set to "1", system clock and operation of the multimaster I 2 C-BUS interface do not stop even when the WIT instruction is executed. When the system clock stop selection bit is "1", do not execute the STP instruction. *Bit 7: I2C-BUS interface pin input level selection bit This bit selects the input level of the SCL and SDA pins of the multimaster I2C-BUS interface. 38 b7 TISS b0 CLK 10 BIT ALS ES0 BC2 BC1 BC0 STP SAD I2C control register (S1D : address 001516) Bit counter (Number of transmit/receive bits) b2 b1 b0 0 0 0 : 8 0 0 1 : 7 0 1 0 : 6 0 1 1 : 5 1 0 0 : 4 1 0 1 : 3 1 1 0 : 2 1 1 1 : 1 I2C-BUS interface enable bit 0 : Disabled 1 : Enabled Data format selection bit 0 : Addressing format 1 : Free data format Addressing format selection bit 0 : 7-bit addressing format 1 : 10-bit addressing format System clock stop selection bit 0 : System clock stop when executing WIT or STP instruction 1 : Not system clock stop when executing WIT instruction (Do not use the STP instruction.) I2C-BUS interface pin input level selection bit 0 : CMOS input 1 : SMBUS input Fig. 34 Structure of I2C control register MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER [I2C Status Register (S1)] 001416 The I2C status register (S1) controls the I2C-BUS interface status. The low-order 4 bits are read-only bits and the high-order 4 bits can be read out and written to. Set "00002" to the low-order 4 bits, because these bits become the reserved bits at writing. *Bit 0: Last receive bit (LRB) This bit stores the last bit value of received data and can also be used for ACK receive confirmation. If ACK is returned when an ACK clock occurs, the LRB bit is set to "0". If ACK is not returned, this bit is set to "1". Except in the ACK mode, the last bit value of received data is input. The state of this bit is changed from "1" to "0" by executing a write instruction to the I2C data shift register (S0). *Bit 1: General call detecting flag (AD0) When the ALS bit is "0", this bit is set to "1" when a general call whose address data is all "0" is received in the slave mode. By a general call of the master device, every slave device receives control data after the general call. The AD0 bit is set to "0" by detecting the STOP condition or START condition, or reset. General call: The master transmits the general call address "00 16" to all slaves. *Bit 2: Slave address comparison flag (AAS) This flag indicates a comparison result of address data when the ALS bit is "0". In the slave receive mode, when the 7-bit addressing format is selected, this bit is set to "1" in one of the following conditions: * The address data immediately after occurrence of a START condition agrees with the slave address stored in the high-order 7 bits of the I2C address register (S0D). * A general call is received. In the slave reception mode, when the 10-bit addressing format is selected, this bit is set to "1" with the following condition: * When the address data is compared with the I2C address register (8 bits consisting of slave address and RWB bit), the first bytes agree. This bit is set to "0" by executing a write instruction to the I 2C data shift register (S0) when ES0 is set to "1" or reset. *Bit 3: Arbitration lost detecting flag (AL) In the master transmission mode, when the SDA is made "L" by any other device, arbitration is judged to have been lost, so that this bit is set to "1". At the same time, the TRX bit is set to "0", so that immediately after transmission of the byte whose arbitration was lost is completed, the MST bit is set to "0". The arbitration lost can be detected only in the master transmission mode. When arbitration is lost during slave address transmission, the TRX bit is set to "0" and the reception mode is set. Consequently, it becomes possible to detect the agreement of its own slave address and address data transmitted by another master device. *Bit 4: SCL pin low hold bit (PIN) This bit generates an interrupt request signal. Each time 1-byte data is transmitted, the PIN bit changes from "1" to "0". At the same time, an interrupt request signal occurs to the CPU. The PIN bit is set to "0" in synchronization with a falling of the last clock (including the ACK clock) of an internal clock and an interrupt request signal occurs in synchronization with a falling of the PIN bit. When the PIN bit is "0", the SCL is kept in the "0" state and clock generation is disabled. Figure 42 shows an interrupt request signal generating timing chart. The PIN bit is set to "1" in one of the following conditions: * Executing a write instruction to the I2C data shift register (S0). (This is the only condition which the prohibition of the internal clock is released and data can be communicated except for the start condition detection.) * When the ES0 bit is "0" * At reset * When writing "1" to the PIN bit by software The conditions in which the PIN bit is set to "0" are shown below: * Immediately after completion of 1-byte data transmission (including when arbitration lost is detected) * Immediately after completion of 1-byte data reception * In the slave reception mode, with ALS = "0" and immediately after completion of slave address agreement or general call address reception * In the slave reception mode, with ALS = "1" and immediately after completion of address data reception *Bit 5: Bus busy flag (BB) This bit indicates the status of use of the bus system. When this bit is set to "0", this bus system is not busy and a START condition can be generated. The BB flag is set/reset by the SCL, SDA pins input signal regardless of master/slave. This flag is set to "1" by detecting the start condition, and is set to "0" by detecting the stop condition. The condition of these detecting is set by the start/stop condition setting bits (SSC4-SSC0) of S2D. When the ES0 bit (bit 3 of S1D) is "0" or reset, the BB flag is set to "0". For the writing function to the BB flag, refer to the sections "START Condition Generating Method" and "STOP Condition Generating Method" described later. Arbitration lost :The status in which communication as a master is disabled. 39 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER *Bit 6: Communication mode specification bit (transfer direction specification bit: TRX) This bit decides a direction of transfer for data communication. When this bit is "0", the reception mode is selected and the data of a transmitting device is received. When the bit is "1", the transmission mode is selected and address data and control data are output onto the SDA in synchronization with the clock generated on the SCL. This bit is set/reset by software and hardware. About set/reset by hardware is described below. This bit is set to "1" by hardware when all the following conditions are satisfied: * When ALS is "0" * In the slave reception mode or the slave transmission mode ___ * When the R/W bit reception is "1" This bit is set to "0" in one of the following conditions: * When arbitration lost is detected. * When a STOP condition is detected. * When writing "1" to this bit by software is invalid by the START condition duplication preventing function (Note). * With MST = "0" and when a START condition is detected. * With MST = "0" and when ACK non-return is detected. * At reset *Bit 7: Communication mode specification bit (master/slave specification bit: MST) This bit is used for master/slave specification for data communication. When this bit is "0", the slave is specified, so that a START condition and a STOP condition generated by the master are received, and data communication is performed in synchronization with the clock generated by the master. When this bit is "1", the master is specified and a START condition and a STOP condition are generated. Additionally, the clocks required for data communication are generated on the SCL. This bit is set to "0" in one of the following conditions. * Immediately after completion of 1-byte data transfer when arbitration lost is detected * When a STOP condition is detected. * Writing "1" to this bit by software is invalid by the START condition duplication preventing function (Note). * At reset Note: START condition duplication preventing function The MST, TRX, and BB bits is set to "1" at the same time after confirming that the BB flag is "0" in the procedure of a START condition occurrence. However, when a START condition by another master device occurs and the BB flag is set to "1" immediately after the contents of the BB flag is confirmed, the START condition duplication preventing function makes the writing to the MST and TRX bits invalid. The duplication preventing function becomes valid from the rising of the BB flag to reception completion of slave address. b7 b0 MST TRX BB PIN AL AAS AD0 LRB I2C status register (S1 : address 001416) Last receive bit (Note) 0 : Last bit = "0" 1 : Last bit = "1" General call detecting flag (Note) 0 : No general call detected 1 : General call detected Slave address comparison flag (Note) 0 : Address disagreement 1 : Address agreement Arbitration lost detecting flag (Note) 0 : Not detected 1 : Detected SCL pin low hold bit 0 : low hold 1 : release Bus busy flag 0 : Bus free 1 : Bus busy Communication mode specification bits 00 : Slave receive mode 01 : Slave transmit mode 10 : Master receive mode 11 : Master transmit mode Note: These bit and flags can be read out but cannot be written. Write "0" to these bits at writing. Fig. 35 Structure of I2C status register SCL PIN I2CIRQ Fig. 36 Interrupt request signal generating timing 40 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER START Condition Generating Method START/STOP Condition Detecting Operation When writing "1" to the MST, TRX, and BB bits of the I2C status register (S1) at the same time after writing the slave address to the I2C data shift register (S0) with the condition in which the ES0 bit of the I 2C control register (S1D) and the BB flag are "0", a START condition occurs. After that, the bit counter becomes "0002" and an SCL for 1 byte is output. The START condition generating timing is different in the standard clock mode and the high-speed clock mode. Refer to Figure 37, the START condition generating timing diagram, and Table 12, the START condition generating timing table. The START/STOP condition detection operations are shown in Figures 39, 40, and Table 14. The START/STOP condition is set by the START/STOP condition set bit. The START/STOP condition can be detected only when the input signal of the SCL and SDA pins satisfy three conditions: SCL release time, setup time, and hold time (see Table 14). The BB flag is set to "1" by detecting the START condition and is reset to "0" by detecting the STOP condition. The BB flag set/reset timing is different in the standard clock mode and the high-speed clock mode. Refer to Table 14, the BB flag set/ reset time. Note: When a STOP condition is detected in the slave mode (MST = 0), an interrupt request signal "I2CIRQ" occurs to the CPU. I2C status register write signal SC L Setup time SDA SCL release time Hold time SCL Fig. 37 START condition generating timing diagram Table 12 START condition generating timing table Item Setup time Hold time START/STOP condition generating selection bit Standard clock mode High-speed clock mode "0" "1" "0" "1" 5.0 s (20 cycles) 13.0 s (52 cycles) 5.0 s (20 cycles) 13.0 s (52 cycles) 2.5 s (10 cycles) 6.5 s (26 cycles) 2.5 s (10 cycles) 6.5 s (26 cycles) Note: Absolute time at = 4 MHz. The value in parentheses denotes the number of cycles. STOP Condition Generating Method When the ES0 bit of the I2C control register (S1D) is "1", write "1" to the MST and TRX bits, and write "0" to the BB bit of the I2C status register (S1) simultaneously. Then a STOP condition occurs. The STOP condition generating timing is different in the standard clock mode and the high-speed clock mode. Refer to Figure 38, the STOP condition generating timing diagram, and Table 13, the STOP condition generating timing table. SDA SCL SDA Fig. 39 START condition detecting timing diagram SCL release time SCL SDA BB flag Setup time Hold time BB flag reset time Fig. 40 STOP condition detecting timing diagram Table 14 START condition/STOP condition detecting conditions Standard clock mode SCL release time SSC value + 1 cycle (6.25 s) Setup time SSC value + 1 cycle < 4.0 s (3.25 s) 2 SSC value cycle < 4.0 s (3.0 s) 2 BB flag set/ reset time Setup time Hold time BB flag reset time BB flag Hold time I2C status register write signal Setup time SSC value -1 + 2 cycles (3.375 s) 2 High-speed clock mode 4 cycles (1.0 s) 2 cycles (1.0 s) 2 cycles (0.5 s) 3.5 cycles (0.875 s) Note: Unit : Cycle number of system clock SSC value is the decimal notation value of the START/STOP condition set bits SSC4 to SSC0. Do not set "0" or an odd number to SSC value. The value in parentheses is an example when the I2C START/ STOP condition control register is set to "1816" at = 4 MHz. Hold time Fig. 38 STOP condition generating timing diagram Table 13 STOP condition generating timing table Item Setup time Hold time START/STOP condition generating selection bit "0" "1" "0" "1" Standard clock mode 5.5 s (22 cycles) 13.5 s (54 cycles) 5.5 s (22 cycles) 13.5 s (54 cycles) High-speed clock mode 3.0 s (12 cycles) 7.0 s (28 cycles) 3.0 s (12 cycles) 7.0 s (28 cycles) Note: Absolute time at = 4 MHz. The value in parentheses denotes the number of cycles. 41 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER [I2C START/STOP Condition Control Register (S2D)] 001716 The I2C START/STOP condition control register (S2D) controls START/STOP condition detection. *Bits 0 to 4: START/STOP condition set bits (SSC4-SSC0) SCL release time, setup time, and hold time change the detection condition by value of the main clock divide ratio selection bit and the oscillation frequency f(XIN) because these time are measured by the internal system clock. Accordingly, set the proper value to the START/STOP condition set bits (SSC4 to SSC0) in considered of the system clock frequency. Refer to Table 14. Do not set "000002" or an odd number to the START/STOP condition set bits (SSC4 to SSC0). Refer to Table 15, the recommended set value to START/STOP condition set bits (SSC4-SSC0) for each oscillation frequency. *Bit 5: SCL/SDA interrupt pin polarity selection bit (SIP) An interrupt can occur when detecting the falling or rising edge of the SCL or SDA pin. This bit selects the polarity of the SCL or SDA pin interrupt pin. *Bit 6: SCL/SDA interrupt pin selection bit (SIS) This bit selects the pin of which interrupt becomes valid between the SCL pin and the SDA pin. Note: When changing the setting of the S CL/SDA interrupt pin polarity selection bit, the SCL /S DA interrupt pin selection bit, or the I 2C-BUS interface enable bit ES0, the SCL/S DA interrupt request bit may be set. When selecting the SCL/SDA interrupt source, disable the interrupt before the SCL/SDA interrupt pin polarity selection bit, the SCL/ SDA interrupt pin selection bit, or the I 2C-BUS interface enable bit ES0 is set. Reset the request bit to "0" after setting these bits, and enable the interrupt. *Bit 7: START/STOP condition generating selection bit (STSPSEL) Setup/Hold time when the START/STOP condition is generated can be selected. Cycle number of system clock becomes standard for setup/hold time. Additionally, setup/hold time is different between the START condition and the STP condition. (Refer to Tables 12 and 13.) Set "1" to this bit when the system clock frequency is 4 MHz or more. Address Data Communication There are two address data communication formats, namely, 7-bit addressing format and 10-bit addressing format. The respective address communication formats are described below. 7-bit addressing format To adapt the 7-bit addressing format, set the 10BIT SAD bit of the I2C control register (S1D) to "0". The first 7-bit address data transmitted from the master is compared with the high-order 7bit slave address stored in the I2C address register (S0D). At the time of this comparison, address comparison of the RWB bit of the I2C address register (S0D) is not performed. For the data transmission format when the 7-bit addressing format is selected, refer to Figure 42, (1) and (2). 42 10-bit addressing format To adapt the 10-bit addressing format, set the 10BIT SAD bit of the I2C control register (S1D) to "1". An address comparison is performed between the first-byte address data transmitted from the master and the 8-bit slave address stored in the I 2C address register (S0). At the time of this comparison, an address comparison between the RWB bit of the I2C address register (S0) and the R/W bit which is the last bit of the address data transmitted from the master is made. In the 10-bit addressing mode, the RWB bit which is the last bit of the address data not only specifies the direction of communication for control data, but also is processed as an address data bit. When the first-byte address data agree with the slave address, the AAS bit of the I2C status register (S1) is set to "1". After the second-byte address data is stored into the I2C data shift register (S0), perform an address comparison between the second-byte data and the slave address by software. When the address data of the 2 bytes agree with the slave address, set the RWB bit of the I2C address register (S0D) to "1" by software. This processing can make the 7-bit slave address and R/ ___ W data agree, which are received after a RESTART condition is detected, with the value of the I2C address register (S0D). For the data transmission format when the 10-bit addressing format is selected, refer to Figure 42, (3) and (4). MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER b7 STSP SEL b0 SIS SIP SSC4SSC3 SSC2 SSC1 SSC0 I2C START/STOP condition control register (S2D : address 001716) START/STOP condition set bits SCL/SDA interrupt pin polarity selection bit 0 : Falling edge active 1 : Rising edge active SCL/SDA interrupt pin selection bit 0 : SDA valid 1 : SCL valid START/STOP condition generating selection bit 0 : Setup/Hold time short mode 1 : Setup/Hold time long mode Fig. 41 Structure of I2C START/STOP condition control register Table 15 Recommended set value to START/STOP condition set bits (SSC4-SSC0) for each oscillation frequency Oscillation frequency f(XIN) (MHz) Main clock divide ratio System clock (MHz) START/STOP condition control register SCL release time (s) Setup time (s) Hold time (s) 8 2 4 8 8 1 4 2 2 2 2 1 XXX11010 XXX11000 XXX00100 XXX01100 XXX01010 XXX00100 6.75 s (27 cycles) 6.25 s (25 cycles) 5.0 s (5 cycles) 6.5 s (13 cycles) 5.5 s (11 cycles) 5.0 s (5 cycles) 3.5 s (14 cycles) 3.25 s (13 cycles) 3.0 s (3 cycles) 3.5 s (7 cycles) 3.0 s (6 cycles) 3.0 s (3 cycles) 3.25 s (13 cycles) 3.0 s (12 cycles) 2.0 s (2 cycles) 3.0 s (6 cycles) 2.5 s (5 cycles) 2.0 s (2 cycles) Note: Do not set "000002" or an odd number to the START/STOP condition set bits (SSC4 to SSC0). S Slave address R/W A Data A Data A/A P A P 7 bits "0" 1 to 8 bits 1 to 8 bits (1) A master-transmitter transnmits data to a slave-receiver S Slave address R/W A Data A Data 7 bits "1" 1 to 8 bits 1 to 8 bits (2) A master-receiver receives data from a slave-transmitter S Slave address R/W 1st 7 bits A Slave address 2nd bytes A Data A Data A/A P 7 bits "0" 8 bits 1 to 8 bits 1 to 8 bits (3) A master-transmitter transmits data to a slave-receiver with a 10-bit address S Slave address R/W 1st 7 bits A Slave address 2nd bytes A Sr Slave address R/W 1st 7 bits "1" 7 bits "0" 8 bits 7 bits (4) A master-receiver receives data from a slave-transmitter with a 10-bit address S : START condition A : ACK bit Sr : Restart condition A Data 1 to 8 bits A Data A P 1 to 8 bits P : STOP condition R/W : Read/Write bit Fig. 42 Address data communication format 43 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Example of Master Transmission An example of master transmission in the standard clock mode, at the S CL frequency of 100 kHz and in the ACK return mode is shown below. (1) Set a slave address in the high-order 7 bits of the I2C address register (S0D) and "0" into the RWB bit. (2) Set the ACK return mode and SCL = 100 kHz by setting "8516" in the I2C clock control register (S2). (3) Set "0016" in the I2C status register (S1) so that transmission/ reception mode can become initializing condition. (4) Set a communication enable status by setting "0816" in the I2C control register (S1D). (5) Confirm the bus free condition by the BB flag of the I2C status register (S1). (6) Set the address data of the destination of transmission in the high-order 7 bits of the I2C data shift register (S0) and set "0" in the least significant bit. (7) Set "F016" in the I2C status register (S1) to generate a START condition. At this time, an SCL for 1 byte and an ACK clock automatically occur. (8) Set transmit data in the I2C data shift register (S0). At this time, an SCL and an ACK clock automatically occur. (9) When transmitting control data of more than 1 byte, repeat step (8). (10) Set "D016" in the I2C status register (S1) to generate a STOP condition if ACK is not returned from slave reception side or transmission ends. Example of Slave Reception An example of slave reception in the high-speed clock mode, at the SCL frequency of 400 kHz, in the ACK non-return mode and using the addressing format is shown below. (1) Set a slave address in the high-order 7 bits of the I2C address register (S0D) and "0" in the RWB bit. (2) Set the no ACK clock mode and S CL = 400 kHz by setting "2516" in the I2C clock control register (S2). (3) Set "0016" in the I2C status register (S1) so that transmission/ reception mode can become initializing condition. (4) Set a communication enable status by setting "0816" in the I2C control register (S1D). (5) When a START condition is received, an address comparison is performed. (6)*When all transmitted addresses are "0" (general call): AD0 of the I2C status register (S1) is set to "1" and an interrupt request signal occurs. * When the transmitted address matches with the address set in (1): ASS of the I2C status register (S1) is set to "1" and an interrupt request signal occurs. * In the cases other than the above AD0 and AAS of the I2C status register (S1) are set to "0" and no interrupt request signal occurs. (7) Set dummy data in the I2C data shift register (S0). (8) When receiving control data of more than 1 byte, repeat step (7). (9) When a STOP condition is detected, the communication ends. 44 Precautions when using multi-master I2CBUS interface (1) Read-modify-write instruction The precautions when the read-modify-write instruction such as SEB, CLB etc. is executed for each register of the multi-master I2C-BUS interface are described below. * I2C data shift register (S0: address 001216) When executing the read-modify-write instruction for this register during transfer, data may become a value not intended. * I2C address register (S0D: address 001316) When the read-modify-write instruction is executed for this register at detecting the STOP condition, data may become a value not intended. It is because H/W changes the read/write bit (RWB) at the above timing. * I2C status register (S1: address 001416) Do not execute the read-modify-write instruction for this register because all bits of this register are changed by H/W. * I2C control register (S1D: address 001516) When the read-modify-write instruction is executed for this register at detecting the START condition or at completing the byte transfer, data may become a value not intended. Because H/W changes the bit counter (BC0-BC2) at the above timing. * I2C clock control register (S2: address 001616) The read-modify-write instruction can be executed for this register. * I 2 C START/STOP condition control register (S2D: address 001716) The read-modify-write instruction can be executed for this register. MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER (2) START condition generating procedure using multi-master 1. Procedure example (The necessary conditions of the generating procedure are described as the following 2 to 5. ..... ..... LDA -- (Taking out of slave address value) SEI (Interrupt disabled) BBS 5, S1, BUSBUSY (BB flag confirming and branch pro cess) BUSFREE: STA S0 (Writing of slave address value) LDM #$F0, S1 (Trigger of START condition generating) CLI (Interrupt enabled) ..... BUSBUSY: CLI (Interrupt enabled) 2. Use "Branch on Bit Set" of "BBS 5, $0014, -" for the BB flag confirming and branch process. 3. Use "STA $12, STX $12" or "STY $12" of the zero page addressing instruction for writing the slave address value to the I2C data shift register. 4. Execute the branch instruction of above 2 and the store instruction of above 3 continuously shown the above procedure example. 5. Disable interrupts during the following three process steps: * BB flag confirming * Writing of slave address value * Trigger of START condition generating When the condition of the BB flag is bus busy, enable interrupts immediately. (4) Writing to I2C status register Do not execute an instruction to set the PIN bit to "1" from "0" and an instruction to set the MST and TRX bits to "0" from "1" simultaneously. It is because it may enter the state that the SCL pin is released and the S DA pin is released after about one machine cycle. Do not execute an instruction to set the MST and TRX bits to "0" from "1" simultaneously when the PIN bit is "1". It is because it may become the same as above. (5) Process of after STOP condition generating Do not write data in the I2C data shift register S0 and the I2C status register S1 until the bus busy flag BB becomes "0" after generating the STOP condition in the master mode. It is because the STOP condition waveform might not be normally generated. Reading to the above registers do not have the problem. (6) ES0 bit switch In standard clock mode when SSC = "000102" or in high-speed clock mode, flag BB may switch to "1" if ES0 bit is set to "1" when SDA is "L". Countermeasure: Set ES0 to "1" when SDA is "H". (3) RESTART condition generating procedure 1. Procedure example (The necessary conditions of the generating procedure are described as the following 2 to 4.) Execute the following procedure when the PIN bit is "0". ..... LDM #$00, S1 LDA -- SEI STA S0 LDM #$F0, S1 CLI (Select slave receive mode) (Taking out of slave address value) (Interrupt disabled) (Writing of slave address value) (Trigger of RESTART condition generating) (Interrupt enabled) ..... 2. Select the slave receive mode when the PIN bit is "0". Do not write "1" to the PIN bit. Neither "0" nor "1" is specified for the writing to the BB bit. The TRX bit becomes "0" and the SDA pin is released. 3. The SCL pin is released by writing the slave address value to the I2C data shift register. 4. Disable interrupts during the following two process steps: * Writing of slave address value * Trigger of RESTART condition generating 45 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER LPC INTERFACE LPC interface function is base on Low Pin Count (LPC) Interface Specification, Revision 1.0. The 3885 supports only I/O read cycle and I/O write cycle. There are two channels of bus buffers to the host. The functions of Input Data Bus Buffer, Output Data Bus Buffer and Data Bus Buffer Status Register are the same as that of the 8042, 3880 group, 3881 group and 3886 group. It can be written in or read out from the host controller through LPC interface. LPC interface function block diagram is shown in Figure 43. Functional input or output pins of LPC interface are shared with Port 8 (P80 -P8 6). Setting the LPC interface enable bit (bit3 of LPCCON) to "1" enables LPC interface. Enabling channel i (i = 0, 1) of the data bus buffer is controlled by the data bus buffer i (i = 0, 1) enable bits (bit 4 or bit 5 of LPCCON). The slave addresses of the data bus buffer channel i (i = 0, 1) are definable by setting LPCi (i = 0, 1) address register H/L (LPC0ADL, LPC0ADH, LPC1ADL, LPC1ADH). The bit 2 value of LPCi address register L is not decoded. This bit returns "0" when the internal CPU read. The bit 2 of slave address is latched to XA2i flag when the host controller writes the data. The input buffer full (IBF) interrupt occurs when the host controller writes the data. The output buffer empty (OBE) interrupt is generated when the host controller reads out the data. The 3885 merges two input buffer full (IBF) interrupt requests and two output buffer empty (OBE) interrupt requests as shown in Figure 44. Table 16 Function explanation of the control pin in LPC interface Pin name Input/ Output P80/LAD0 I/O P81/LAD1 I/O P82/LAD2 I/O P83/LAD3 I/O Function These pins communicate address, control and data information between the host and the data bus buffer of the 3885. P84/LFRAME I Input the signal to indicate the start of new cycle and termination of abnormal communication cycles. P85/LRESET I Input the signal to reset the LPC interface function. P86/LCLK I Input the LPC synchronous clock signal. 46 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Address register LL Address register LH Address register HL RD/WR register Address register HH P80/LAD0 Start register Input Data Comparator P84/LFRAME P85/LRESET P86/LCLK P81/LAD1 Input Data Bus Buffer [7:4] Input Data Bus Buffer [3:0] Output Data Bus Buffer [7:4] Output Data Bus Buffer [3:0] Internal CPU Bus P82/LAD2 LPC Data Bus Input Control Circuit P83/LAD3 Data bus buffer status register U7i U6i U5i U4i XA2i U2i IBFi OBFi TAR register SYNC register Output Control Circuit Interrupt signal IBF, OBE Interrupt Generate Circuit 0 b6 b5 b4 b3 b2 b1 b0 LPC control register (LPCCON) Fig. 43 Block diagram of LPC interface function (1ch) 47 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Input buffer full flag 0 IBF0 Rising edge detection circuit One-shot pulse generating circuit Input buffer full interrupt request signal IBF Input buffer full flag 1 IBF1 Output buffer full flag 0 OBF0 Rising edge detection circuit OBE0 Output buffer full flag 1 OBF1 OBE1 One-shot pulse generating circuit Rising edge detection circuit One-shot pulse generating circuit Rising edge detection circuit One-shot pulse generating circuit Output buffer empty interrupt request signal OBE IBF0 IBF1 IBF Interrupt request is set at this rising edge OBF0 (OBE0) OBF1 (OBE1) OBE Interrupt request is set at this rising edge Fig. 44 Interrupt request circuit of data bus buffer 48 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER [LPC Control Register (LPCCON)] 002A16 * SYNC output select bit (SYNCSEL) "00": OK "01": LONG & OK "10": Err "11": LONG & Err * LPC interface software reset bit (LPCSR) "0": Reset release (automatic) "1": Reset * LPC interface enable bit (LPCBEN) "0": P80-P86 works as port "1": P80-P86 works as LPC interface * Data bus buffer 0 enable bit (DBBEN0) "0": Data bus buffer 0 disable "1": Data bus buffer 0 enable * Data bus buffer 1 enable bit (DBBEN1) "0": Data bus buffer 1 disable "1": Data bus buffer 1 enable [Output Data Bus Buffer i (i = 0, 1) (DBBOUT0, DBBOUT1)] 002816, 002B16 Writing data to data bus buffer registers (DBB0 , DBB1) address from the internal CPU means writing to DBBOUTi (i = 0, 1). The data of DBBOUTi (i = 1, 0) is read out from the host controller when bit 2 of slave address (A2) is "0". [LPCi address register H/L (LPC0ADL, LPC1ADL / LPC0ADH, LPC1ADH)] 0FF016 to 0FF316 The slave addresses of data bus buffer channel i(i=0,1) are definable by setting LPCi address registers H/L (LPC0ADL, LPC0ADH, LPC1ADL, LPC1ADH ). These registers can be set and cleared any time. When the internal CPU reads LPCi address register L, the bit 2 (A2) is fixed to "0". The bit 2 of slave address (A2) is latched to XA2i flag when the host controller writes the data. The slave addresses, set in these registers, is used for comparing with the addresses from the host controller. Bits 0 and 1 of the LPC control register (LPCCON) specify the SYNC code output. Bit 2 of the LPC control register (LPCCON) enables the LPC interface to enter the reset state by software. When LPCSR is set to "1", LPC interface is initialized in the same manner as the external "L" input to LRESET pin (See Figure 50). Writing "0" to LPCSR the reset state will be released after 1.5 cycle of and this bit is cleared to "0". [Data Bus Buffer Status Register i (i = 0, 1) (DBBSTS0, DBBSTS1)] 002916, 002C16 Bits 0, 1 and 3 are read-only bits and indicate the status of the data bus buffer. Bits 2, 4, 5, 6 and 7 are user definable flags which can be read and written by software. The data bus buffer status register can be read out by the host controller when bit 2 of the slave address (A2) is "1". *Bit 0: Output buffer full flag i (OBFi) This bit is set to "1" when a data is written into the output data bus buffer i and cleared to "0" when the host controller reads out the data from the output data bus buffer i. *Bit 1: Input buffer full flag i (IBFi) This bit is set to "1" when a data is written into the input data bus buffer i by the host controller, and cleared to "0" when the data is read out from the input data bus buffer i by the internal CPU. *Bit 3: XA2 flag (XA2i) The bit 2 of slave address is latched while a data is written into the input data bus buffer i. [Input Data Bus Buffer i(i=0,1) (DBBIN0, DBBIN1)] 002816, 002B16 In I/O write cycle from the host controller, the data byte of the data phase is latched to DBBINi (i=0,1). The data of DBBINi can be read out form the data bus buffer registers (DBB0, DBB1) address in SFR area. 49 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER LPC control register b7 b6 b5 b4 b3 b2 b1 b0 Symbol LPCCON Address 002A16 Bit symbol When reset 000000002 Bit name Function SYNC output select bit 00 : OK 01 : Long & OK 10 : Err 11 : Long & Err LPCSR LPC interface software reset bit 0 : Reset release(automatic) 1 : Reset LPCEN LPC interface enable bit 0 : P80 to P86 as port 1 : LPC interface enable DBBEN0 Data bus buffer 0 enable bit 0 : Data bus buffer 0 disable 1 : Data bus buffer 0 enable DBBEN1 Data bus buffer 1 enable bit 0 : Data bus buffer 1 disable 1 : Data bus buffer 1 enable SYNCSEL R W Cannot write to this bit. Returns "0" when read. Fig. 45 LPC control register Data bus buffer status register i (i = 0, 1) b7 b6 b5 b4 b3 b2 b1 b0 Symbol DBBSTS0 DBBSTS1 Bit symbol Bit name When reset 000000002 000000002 Function OBFi Output buffer full flag 0 : Buffer empty 1 : Buffer full IBFi Input buffer full flag 0 : Buffer empty 1 : Buffer full U2i User definable flag This flag can be freely defined by user. XA2i XA2i flag This flag indicates the A2 status when IBFi flag is set. U4i User definable flag This flag can be freely defined by user. U5i U6i U7i Fig. 46 Data bus buffer control register 50 Address 002916 002C16 R W MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER LPCi address register L (i=0,1) b7 b6 b5 b4 b3 b2 b1 b0 (Note2) Symbol LPC0ADL LPC1ADL Bit symbol Address 0FF02 0FF22 When reset 000000002 000000002 R W Bit name LPCSAD0 Slave address bit 0 LPCSAD1 Slave address bit 1 LPCSAD2 Slave address bit 2 (Note 1) LPCSAD3 Slave address bit 3 LPCSAD4 Slave address bit 4 LPCSAD5 Slave address bit 5 LPCSAD6 Slave address bit 6 LPCSAD7 Slave address bit 7 Notes 1: Always returnes "0" when read , even if writing "1" to this bit. 2: Do not set the same 16-bit slave address to both channel 0 and channel 1. LPCi address register H (i=0,1) b7 b6 b5 b4 b3 b2 b1 b0 Symbol LPC0ADH LPC1ADH Bit symbol Address 0FF12 0FF32 Bit name LPCSAD8 Slave address bit 8 LPCSAD9 Slave address bit 9 LPCSAD10 Slave address bit 10 LPCSAD11 Slave address bit 11 LPCSAD12 Slave address bit 12 LPCSAD13 Slave address bit 13 LPCSAD14 Slave address bit 14 LPCSAD15 Slave address bit 15 When reset 000000002 000000002 R W Fig. 47 LPC related registers 51 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Basic Operation of LPC Interface (2) Example for I/O read cycle Set up steps for LPC interface is as below. *Set the LPC interface enable bit (bit3 of LPCCON) to "1". *Choose which data bus buffer channel use. *Set the data bus buffer i enable bit (i = 0, 1) (bit 4 or 5 of LPCCON) to "1". *Set the slave address to LPCi address register L and H (i = 0, 1) (LPC0ADL, LPC0ADH, LPC1ADL, LPC1ADH). The I/O read cycle timing is shown in Figure 49. The standard transfer cycle number of I/O read cycle is 13. The data on LAD [3:0] is monitored at every rising edge of LCLK. The communication starts from the falling edge of LFRAME. *1st clock: The last clock when LFRAME is "Low". The host sends "00002" on LAD [3:0] for communication start. *2nd clock: LFRAME is "High". The host sends "000X 2" on LAD [3:0] to inform the cycle type as I/O read. * From 3rd clock to 6th clock: In these four cycles , the host sends 16-bit slave address. The 3885 compares it with the LPCi address register H or L (i = 0, 1). 3rd clock: The slave address bit [15:12]. 4th clock: The slave address bit [11:8]. 5th clock: The slave address bit [7:4]. 6th clock: The slave address bit [3:0]. * 7thclock and 8thclock are used for turning the communication direction from the hostthe peripheral to the peripheralthe host. 7th clock: The host outputs "11112" on LAD [3:0]. 8th clock: The LAD [3:0] is set to tri-state by the host to turn the communication direction. * 9th clock: The 3885 outputs "00002" (SYNC OK) to LAD [3:0] for acknowledgment. * 10th clock and 11th clock are used for one data byte transfer from the output data bus buffer i (DBBOUTi) or data bus buffer status register i (DBBSTSi). 10th clock: The 3885 sends the data bit [3:0]. 11th clock: The 3885 sends the data bit [7:4]. th * 12 clock: The 3885 outputs "11112" to LAD [3:0]. In this timing OBFi (bit 2 of DBBSTSi) is cleared to "0" and OBE interrupt signal is generated. * 13th clock: The LAD [3:0] is set to tri-state by the host to turn the communication direction. (1) Example of I/O write cycle The I/O write cycle timing is shown in Figure 48. The standard transfer cycle number of I/O write cycle is 13. The communication starts from the falling edge of LFRAME. The data on LAD [3:0] is monitored at every rising edge of LCLK. * 1st clock: The last clock when LFRAME is "Low". The host send "00002" on LAD [3:0] for communication start. * 2 nd clock: LFRAME is "High". The host send "001X 2" on LAD [3:0] to inform the cycle type as I/O write. * From 3rd clock to 6th clock : In these four cycles , the host sends 16-bit slave address. The 3885 compares it with the LPCi address register H and L (i = 0, 1). 3rd clock: The slave address bit [15:12]. 4th clock: The slave address bit [11:8]. 5th clock: The slave address bit [7:4]. 6th clock: The slave address bit [3:0]. * 7th clock and 8th clock are used for one data byte transfer. The data is written to the input data bus buffer (DBBINi, i = 0, 1) 7th clock: The host sends the data bit [3:0]. 8th clock: The host sends the data bit [7:4]. th * 9 clock and 10th clock are for turning the communication direction from the hostthe peripheral to the slavethe host. 9th clock: The host outputs "11112" on LAD [3:0]. 10th clock: The LAD [3:0] is set to tri-state by the host to turn the communication direction. * 11th clock: The 3885 outputs "00002" (SYNC OK) to LAD [3:0] for acknowledgment. * 12th clock: The 3885 outputs "11112" to LAD [3:0]. In this timing the address bit 2 is latched to XA2i (bit3 of DBBSTSi), IBFi (bit 1 of DBBSTSi) is set to "1" and IBF interrupt signal is generated. * 13th clock: The LAD [3:0] is set to tri-state by the host to turn the communication direction. 52 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Data write (I/O write cycle) START CYCTYPE + DIR ADDRESS DATA TAR SYNC TAR LCLK LFRAME (Note) LAD [3:0] Input data bus buffer i XA2i flag IBFi flag driven by the host Command driven by the 3885 write (I/O write cycle) START CYCTYPE + DIR ADDRESS DATA TAR SYNC TAR LCLK LFRAME (Note) LAD [3:0] Input data bus buffer i XA2i flag IBFi flag driven by the host driven by the 3885 Note: LAD0 to LAD3 pins remain tri-state after transfer completion. Fig. 48 Data and command write timing 53 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Data Read (I/O read cycle) START CYCTYPE + DIR ADDRESS TAR SYNC DATA TAR LCLK LFRAME (Note 1) LAD [3:0] Output data bus buffer i OBFi flag driven by the host driven by the 3885 Status Read (I/O read cycle) START CYCTYPE + DIR ADDRESS TAR SYNC DATA TAR LCLK LFRAME (Note 1) LAD [3:0] OBFi flag (Note 2) driven by the host driven by the the 3885 Notes 1: LAD0 to LAD3 pins remain tri-state after transfer completion. 2: OBFi flag does not change. Fig. 49 Data and status read timing 54 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER LPCSR write signal LPCSR bit (LPC interface software reset signal) 1.5 cycle of LRESET CPU Data bus bit 2 LPCSR write signal D Q D CK R Q CK R D LPC interface reset signal Q CK R CPU RESET CPU RESET Fig. 50 Reset timing and block Table 17 Reset conditions of LPC interface function Pin name / Internal register Pin P80/LAD0 LRESET = "L" Note Tri-state P81/LAD1 P82/LAD2 P83/LAD3 P84/LFRAME Input P85/LRESET P86/LCLK LPC bus interface function Input Input data bus buffer registeri Output data bus buffer registeri Keep same value before LRESET goes "L". Internal register Uxi flag 7, 6, 5, 4, 2 XA2i flag IBFi flag Initialization to "0". Initialization to "0". There is possibility to generate OBFi flag Initialization to "0". IBF interrupt request. There is possibility to generate LPCi address register Keep same value before OBE interrupt request. LRESET goes "L". LPCCON 55 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER SERIALIZED INTERRUPT The serialized IRQ circuit communicates the interrupt status to the host controller based on the Serialized IRQ Support for PCI System, Version 6.0. Table 18 shows the summary of serialized interrupt of 3885. Table 18 Smmary of serialized IRQ function Item The factors of serialized IRQ The number of frame Operation clock Clock restart Clock stop inhibition 56 Function The numbers of serialized IRQ factor that can output simultaneously are 3. * Channel 0 (IRQ1,IRQ2) Setting Software IRQi (i = 1, 12) request bit (bits 0, 1 of SERIRQ) to "1". The "1" of OBF0 and Hardware IRQi ( i=1, 12) request bit (bits 3, 4 of SERCON) to "1". * Channel 1 (IRQx ; user selectable) Setting the IRQx request bit (bit 7 of SERIRQ) to "1". The "1" of OBF1 and Hardware IRQx request bit to "1". * Channel 0 (IRQ1, IRQ12) Setting Software IRQ1 request bit (bit 0 of SERIRQ) to "1" or detecting "1" of OBF0 with "1" of Hardware IRQ1 request bit (bit 4 of SERCON) selects IRQ1 Frame . Setting IRQ12 Software request bit (bit 1 of SERIRQ) to "1" or detecting "1" of OBF0 with "1" of Hardware IRQ1 request bit (bit 4 of SERCON) selects IRQ12 Frame. * Channel 1 (IRQx ; user selectable) Setting IRQx frame select bit (bit 2-6 of SERIRQ) selects IRQ 1-15 frame or extend frame 0-10. Synchronized with LCLK (Max. 33 MHz). LPC clock restart enable bit (bit 1 of SERCON) enables restart owing to "L" output of CLKRUN with the interrupt when the LPC clock has stopped or slowed down. LPC clock stop inhibition bit (bit 2 of SERCON) enables the inhibition of clock stop control during the IRQSER cycle when the clock tends to stop or slow down. MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Internal data bus Serialized IRQ control register Serialized IRQ request register b7 b6 b5 b4 b3 b2 b1 b0 b7 b6 b5 b4 b3 b2 b1 b0 Clock stop inhibition enable and clock restart enable Software Serialized IRQ request OBF interrupt control Serialized IRQ enable Serialized interrupt request control circuit OBF0 - OBF1 Serialized IRQ request IRQx frame number Frame number SERIRQ Serialized interrupt control circuit Clock operation status and finish acknowledgement Clock restart request and start frame activate request Clock monitor control circuit * CLKRUN# LCLK LRESET# CPU clock * Open Drain Fig. 51 Block diagram of serialized interrupt 57 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Register Explanation Bit 3 : Hardware IRQ1 request bit (SEIR1) When this bit is "1", OBF0 status is directly connected to the IRQ1 frame. The serialized IRQ function is configured and controlled by the serialized IRQ request register (SERIRQ) and the serialized IRQ control register (SERCON). Bit 4 : Hardware IRQ12 request bit (SEIR12 ) When this bit is "1", OBF0 status is directly connected to IRQ12 frame. [Serialized IRQ control register (SERCON)] 001D16 Bit 0 : Serialized IRQ enable bit (SIRQEN ) This bit enables/disables the serialized IRQ interface. When this bit is "1", use of serialized IRQ is enabled. Then P87 functions as IRQ/Data line (SERIRQ) and P47 functions as CLKRUN. Output structure of CLKRUN pin becomes N-channel open drain. Bit 5 : Hardware IRQx request bit (SEIRx ) When this bit is "1", OBF1 status is directly connected to the IRQx frame. Bit 1 : LPC clock restart enable bit (RUNEN ) Setting this bit to "1" enables clock restart with "L" output of CLKRUN. Bit 6 : IRQ1/IRQ12 disable bit (SCH0EN ) This bit controls whether the serialized IRQ channel 0 transfers the IRQ1 and IRQ12 frame to the host or not. Bit 2 : LPC clock stop inhibition bit (SUPEN ) Setting this bit to "1" makes CLKRUN output change to "L" for inhibiting the clock stop. Bit 7 : IRQx output polarity bit (SCH1POL) This bit selects IRx frame output level. Serialized IRQ control register b7 b6 b5 b4 b3 b2 b1 b0 Symbol SERCON Bit symbol Bit name When reset 000000002 Function SIRQEN Serialized IRQ enable bit 0 : Serialized IRQ disable 1 : Serialized IRQ enable RUNEN LPC clock restart enable bit 0 : Clock restart disable 1 : Clock restart enable SUPEN LPC clock stop inhibition bit 0 : Stop inhibition control disable 1 : Stop inhibition control enable SEIR1 Hardware IRQ1 request bit 0 : No IRQ1 request 1 : OBF0 synchronized IRQ1 request SEIR12 Hardware IRQ12 request bit 0 : No IRQ12 request 1 : OBF0 synchronized IRQ12 request SEIRx Hardware IRQx request bit 0 : No IRQx request 1 : OBF1 synchronized IRQx request SCH0EN IRQ1/IRQ12 disable bit 0 : IRQ1/IRQ12 output enable 1 : IRQ1/IRQ12 output disable SCH1POL IRQx output polarity bit 0 : -Request Hiz-Hiz-Hiz -No request L-H-Hiz 1 : -Request L-H-Hiz -No request Hiz-Hiz-Hiz Fig. 52 Configuration of serialized IRQ control register 58 Address 001D16 R W MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER [Serialized IRQ request register (SERIRQ)] 001F16 The interrupt source is definable by this register. Bit 0 : Software IRQ1 request bit (IR1) SERIRQ line shows IR1 value at the sample phase of IRQ1 frame, when the SCH0EN is "1". Bit 1 : Software IRQ12 request bit (IR12) SERIRQ line shows IR12 value at the sample phase of IRQ12 frame, when the SCH0EN is "1". Bits 2-6 : IRQx frame select bits (ISi, i = 0-4) These bits select the active IRQ frame of serial IRQ channel 1. When these bit are "000002", the serial IRQ channel 1 is disabled. Bit 7 : Software IRQx request bit (IRx) SERIRQ line shows IRx value at the sample phase of IRQx frame which is selected by bits 2 to 6 of SERIRQ. Output level is selectable by the IRQx output polarity bit (SCH1POL). Serialized IRQ request register b7 b6 b5 b4 b3 b2 b1 b0 Symbol SERIRQ Address 001F16 Bit symbol When reset 000000002 Bit name Function IR1 Software IRQ1 request bit 0: No IRQ1 request 1: IRQ1 request IR12 Software IRQ12 request bit 0: No IRQ12 request 1: IRQ12 request IS0 IRQx frame select bit b6b5b4b3b2 0 0 0 0 0 : Disable serial IRQ channel 1 0 0 0 0 1 : IRQ1 Frame 0 0 0 1 0 : IRQ2 Frame 0 0 0 1 1 : IRQ3 Frame 0 0 1 0 0 : IRQ4 Frame 0 0 1 0 1 : IRQ5 Frame 0 0 1 1 0 : IRQ6 Frame 0 0 1 1 1 : IRQ7 Frame 0 1 0 0 0 : IRQ8 Frame 0 1 0 0 1 : IRQ9 Frame 0 1 0 1 0 : IRQ10 Frame 0 1 0 1 1 : IRQ11 Frame 0 1 1 0 0 : IRQ12 Frame 0 1 1 0 1 : IRQ13 Frame 0 1 1 1 0 : IRQ14 Frame 0 1 1 1 1 : IRQ15 Frame 1 0 0 0 0 : Do not select 1 0 0 0 1 : Do not select 1 0 0 1 0 : Do not select 1 0 0 1 1 : Do not select 1 0 1 0 0 : Do not select 1 0 1 0 1 : Extend Frame 0 1 0 1 1 0 : Extend Frame 1 1 0 1 1 1 : Extend Frame 2 1 1 0 0 0 : Extend Frame 3 1 1 0 0 1 : Extend Frame 4 1 1 0 1 0 : Extend Frame 5 1 1 0 1 1 : Extend Frame 6 1 1 1 0 0 : Extend Frame 7 1 1 1 0 1 : Extend Frame 8 1 1 1 1 0 : Extend Frame 9 1 1 1 1 1 : Extend Frame 10 IS1 IS2 IS3 IS4 IRx R W Software IRQx request bit 0: No IRQx request 1: IRQx request Fig. 53 Structure of serialized IRQ request register 59 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Operation of Serialized IRQ A cycle operation of serialized IRQ starts with Start Frame and finishes with Stop Frame. There are two modes of operation : Continuous (Idle) mode and Quiet (Active) mode. The next operation mode is determined by monitoring the stop frame pulse width. Timing of serialized IRQ cycle Figure 54 shows the timing diagram of serialized IRQ cycle. (1) Start Frame The Start Frame is detected when the SERIRQ line remains "L" in 4 to 8 clocks. Start frame IRQ0 frame IRQ1 frame (2) IRQ/Data Frame Each IRQ/Data Frame is three clocks. When the IRQi (i = 0, 1, x) request is "0", then the SERIRQ line is driven to "L" during the Sample phase (1st clock) of the corresponding IRQ/Data frame, to "H" during the Recovery phase (2nd clock), to tri-state during the Turn-around phase (3rd clock). When the IRQi request is "1", then the SERIRQ line is tri-state in all phases (3 clocks period). (3) Stop Frame The Stop Frame is detected when the SERIRQ line remains "L" in 2 or 3 clocks. The next operation mode is Quiet mode when the pulse width of "L" is 2 clocks. The next operation mode is the Continuous mode when the pulse width is 3 clocks. IRQ15 frame IOCHK frame Stop frame Clock SERIRQ Driver source Host control Fig. 54 Timing diagram of serialized IRQ cycle 60 IRQ1 device control IRQ15 device control Host control To the next cycle MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Operation Mode Figure 55 shows the timing of continuous mode; Figure 56 shows that of Quiet mode. (1) Continuous mode Serialized IRQ cycles starts in Continuous mode after CPU reset in the case of LRESET = "L" and the previous stop frame being 3 clocks. Start frame (Note) After receiving the start frame; the IRQ1 Frame, IRQ12 Frame or IRQx frame is asserted. Note : If the pulse width of "L" is less than 4 clocks, or 9 clocks or more; the start frame is not detected and the next start (the falling edge of SERIRQ) is waited. IRQ0 frame IRQ1 frame IRQ2 frame IRQ3 frame LCLK SERIRQ line Host SERIRQ output 3885 SERIRQ output Drive source Host 3885 Note: The start frame count is 4 clocks as exemple. Fig. 55 Timing diagram of Continuous mode (2) Quiet mode At clock stop, clock slow down or the pulse width of the last stop frame being 2 clocks, it is the Quiet mode. In this mode the 3885 drives the SERIRQ line to "L" in the 1 st clock. After that the host drives the rest start frame (Note). The IRQ1 frame, IRQ12 frame or IRQx frame is asserted. Start frame (Note) Note: When the sum of pulse width of "L" driven by the 3885 in the 1 st clock and driven by the host in the rest clocks is within 4 to 8-clock cycles, the start frame is detected. If the sum of pulse width of "L" is less than 4 clocks, or 9 clocks or more; the start frame is not detected and the next start (the falling edge of SERIRQ) is waited. IRQ0 frame IRQ1 frame IRQ2 frame IRQ3 fra LCLK SERIRQ line Host SERIRQ output 3885 SERIRQ output Drive source 3885 3885 Host Note: The start frame count is 4 clocks as exemple Fig. 56 Timing diagram of Quiet mode 61 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Clock Restart/Stop Inhibition Request Asserting the CLKRUN signal can request the host to restart for clocks stopped or slowed down, or maintain the clock tending to stop or slow down. Figure 57 shows the timing diagram of clock restart request; Figure 58 shows an example of timing of clock stop inhibition request. (1) Clock restart operation In case the LPC clock restart enable bit (bit 1 of SERCON) is "1" and the CLKRUN (BUS) is "H", when the serialized interrupt request occurs, the 3885 drives CLKRUN to "L" for requesting the PCI clock generator to restart the LCLK if the clock is slowed down or stopped. LCLK Bus CLKRUN Central Resource CLKRUN Restart frame 3885 CLKRUN Start frame Bus SERIRQ Host SERIRQ 3885 SERIRQ Interrupt request Internal restart request signal Fig. 57 Timing diagram of clock restart request (2) Clock stop inhibition request In case the LPC clock stop inhibition bit (bit 2 of SERCON) is "1" and the serialized interrupt request is held, if the LCLK tends to stop, the 3885 drives CLKRUN to "L" for requesting the PCI clock generator not to stop LCLK. LCLK Bus CLKRUN Central Resource CLKRUN Inhibition request 3885 CLKRUN Bus SERIRQ Interrupt request Internal inhibition request signal Fig. 58 Timing diagram of clock stop inhibition request 62 IRQSER cycle MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER A-D CONVERTER [A-D Conversion Register 1,2 (AD1, AD2)] 003516, 003816 The A-D conversion register is a read-only register that stores the result of an A-D conversion. When reading this register during an A-D conversion, the previous conversion result is read. Bit 7 of the A-D conversion register 2 is the conversion mode selection bit. When this bit is set to "0," the A-D converter becomes the 10-bit A-D mode. When this bit is set to "1," that becomes the 8-bit A-D mode. The conversion result of the 8-bit A-D mode is stored in the A-D conversion register 1. As for 10-bit A-D mode, 10-bit reading or 8-bit reading can be performed by selecting the reading procedure of the A-D conversion register 1, 2 after A-D conversion is completed (in Figure 60). The A-D conversion register 1 performs the 8-bit reading inclined to MSB after reset, the A-D conversion is started, or reading of the A-D converter register 1 is generated; and the register becomes the 8-bit reading inclined to LSB after the A-D converter register 2 is generated. Channel Selector The channel selector selects one of ports P60/AN0 to P6 7/AN7 , and inputs the voltage to the comparator. Comparator and Control Circuit The comparator and control circuit compares an analog input voltage with the comparison voltage, and then stores the result in the A-D conversion registers 1, 2. When an A-D conversion is completed, the control circuit sets the A-D conversion completion bit and the A-D interrupt request bit to "1". Note that because the comparator consists of a capacitor coupling, set f(XIN) to 500 kHz or more during an A-D conversion. b7 b0 AD/DA control register (ADCON : address 003416) Analog input pin selection bits b2 b1 b0 0 0 0 0 1 1 1 1 [AD/DA Control Register (ADCON)] 003416 The AD/DA control register controls the A-D conversion process. Bits 0 to 2 select a specific analog input pin. Bit 3 signals the completion of an A-D conversion. The value of this bit remains at "0" during an A-D conversion, and changes to "1" when an A-D conversion ends. Writing "0" to this bit starts the A-D conversion. 0: P60/AN0 1: P61/AN1 0: P62/AN2 1: P63/AN3 0: P64/AN4 1: P65/AN5 0: P66/AN6 1: P67/AN7 A-D conversion completion bit 0: Conversion in progress 1: Conversion completed PWM0 output pin selection bit 0: P56/PWM01 1: P30/PWM00 Comparison Voltage Generator The comparison voltage generator divides the voltage between AVSS and VREF into 1024, and outputs the divided voltages in the 10-bit A-D mode (256 division in 8-bit A-D mode). The A-D converter successively compares the comparison voltage Vref in each mode, dividing the VREF (see below), with the input voltage. * 10-bit A-D mode (10-bit reading) VREF Vref = 1024 n (n = 0-1023) * 10-bit A-D mode (8-bit reading) VREF Vref = 256 n (n = 0-255) * 8-bit A-D mode VREF Vref = 256 (n-0.5) (n = 1-255) =0 (n = 0) 0 0 1 1 0 0 1 1 PWM1 output pin selection bit 0: P57/PWM11 1: P31/PWM10 DA1 output enable bit 0: DA1 output disabled 1: DA1 output enabled DA2 output enable bit 0: DA2 output disabled 1: DA2 output enabled Fig. 59 Structure of AD/DA control register 10-bit reading (Read address 003816 before 003516) b7 (Address 003816) 0 b0 b9 b8 b7 (Address 003516) b0 b7 b6 b5 b4 b3 b2 b1 b0 Note: Bits 2 to 6 of address 003816 becomes "0"at reading. 8-bit reading (Read only address 003516) b7 (Address 003516) b0 b9 b8 b7 b6 b5 b4 b3 b2 Fig. 60 Structure of 10-bit A-D mode reading 63 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Data bus AD/DA control register (Address 003416) b7 b0 3 A-D interrupt request A-D control circuit Channel selector P60/AN0 P61/AN1 P62/AN2 P63/AN3 P64/AN4 P65/AN5 P66/AN6 P67/AN7 Comparator A-D conversion register 2 A-D conversion register 1 10 Resistor ladder VREF AVSS Fig. 61 Block diagram of A-D converter 64 (Address 003816) (Address 003516) MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER D-A CONVERTER The 3885 group has two internal D-A converters (DA1 and DA2) with 8-bit resolution. The D-A converter is performed by setting the value in each D-A conversion register. The result of D-A conversion is output from the DA1 or DA2 pin by setting the DA output enable bit to "1". When using the D-A converter, the corresponding port direction register bit (P56 for DA1 or P57 for DA2) must be set to "0" (input status). The output analog voltage V is determined by the value n (decimal notation) in the D-A conversion register as follows: Data bus D-A1 conversion register (8) V = VREF n/256 (n = 0 to 255) Where VREF is the reference voltage. R-2R resistor ladder DA1 output enable bit P56/DA1/PWM01 D-A2 conversion register (8) At reset, the D-A conversion registers are cleared to "0016", the DA output enable bits are cleared to "0", and the P56/DA1/PWM01 and P57/DA2/PWM11 pins become high impedance. The DA output does not have buffers. Accordingly, connect an external buffer when driving a low-impedance load. R-2R resistor ladder DA2 output enable bit P57/DA2/PWM11 Fig. 62 Block diagram of D-A converter "0" DA1 output enable bit R R R R R R R 2R P56/DA1/PWM01 "1" 2R 2R MSB D-A1 conversion register "0" 2R 2R 2R 2R 2R 2R LSB "1" AVSS VREF Fig. 63 Equivalent connection circuit of D-A converter (DA1) 65 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER COMPARATOR CIRCUIT Comparator Configuration The comparator circuit consists of the ladder resistors, the analog comparators, a comparator control circuit, the comparator reference input selection bit (bit 7 of PCTL2), a comparator data register (CMPD), the comparator reference power source input pin (P20/CMPREF) and analog input pins (P30-P37). The analog input pin (P30-P37) also functions as an ordinary digital port. Comparator Operation To activate the comparator circuit, first set port P3 to input mode by setting the corresponding direction register (P3D) to "0" to use port P3 as an analog voltage input pin. The internal fixed analog voltage (VCC 29/32) can be generated by setting "1" to the comparator reference input selection bit (bit 7 of PCTL2). The internal fixed analog voltage becomes about 2.99 V at VCC = 3.3 V. When setting "0" to the comparator reference input selection bit, the P20/ CMPREF pin becomes the comparator reference power source input pin and it is possible to input the comparator reference power source optionally from the external. The voltage comparison is immediately performed by the writing operation to the comparator data register (CMPD). After 14 cycles of the internal system clock (the time required for the comparison), the comparison result is stored in the comparator data register (CMPD). If the analog input voltage is greater than the internal reference voltage, each bit of this register is "1"; if it is less than the internal reference voltage, each bit of this register is "0". To perform another comparison, the voltage comparison must be performed again by writing to the comparator data register (CMPD). Read the result when 14 cycles of or more have passed after the comparator operation starts. The ladder resistor is turned on during 14 cycles of , which is required for the comparison, and the reference voltage is generated. An unnecessary current is not consumed because the ladder resistor is turned off while the comparator operation is not performed. Since the comparator consists of capacitor coupling, the electric charge may lost if the clock frequency is low. Keep the clock frequency more than 1 MHz during the comparator operation. Do not execute the STP, WIT, or port P3 I/O instruction. Data bus 8 8 P3 (8) Comparator data register b0 P37 Comparator P36 Comparator "0" P30 Comparator P20/CMPREF Fig. 64 Comparator circuit 66 Comparator reference input selection bit (bit 7 of PCTL2) VCC "1" Comparator Comparator connecting control circuit Ladder resistor signal connecting signal VSS VCC29/32 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER RESET CIRCUIT ____________ To reset the microcomputer, RESET pin should be held at an "L" level for 16 XIN cycle or more. (When the power source voltage should be between 3.3V 0.3V and the oscillation should be ____________ stable.) Then the RESET pin set to "H", the reset state is released. After the reset is completed, the program starts from the address contained in address FFFD 16 (high-order byte) and address FFFC16 (low-order byte). Make sure that the reset input voltage is less than 0.6 V for VCC of 3.0 V. Poweron RESET Power source voltage 0V VCC Reset input voltage 0V (Note) 0.2VCC Note : Reset release voltage ; Vcc=3.0 V RESET VCC Power source voltage detection circuit Fig. 65 Reset circuit example XIN RESET Internal reset Address ? ? ? ? FFFC FFFD ADH,L Reset address from the vector table. ? Data ? ? ? ADL ADH SYNC XIN: 10.5 to 18.5 clock cycles Notes 1: The frequency relation of f(XIN) and f() is f(XIN)=8 * f(). 2: The question marks (?) indicate an undefined data that depends on the previous state. Fig. 66 Reset sequence 67 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Address Register contents (1) Port P0 (P0) 000016 0016 (38) Timer X (TX) 002516 FF16 (2) Port P0 direction register (P0D) 000116 0016 (39) Prescaler Y (PREY) 002616 FF16 (3) Port P1 (P1) 000216 0016 (40) Timer Y (TY) 002716 FF16 (4) Port P1 direction register (P1D) 000316 0016 (41) Data bus buffer register 0 (DBB0) 002816 X X X X X X X X (5) Port P2 (P2) 000416 0016 (42) Data bus buffer status register 0 (DBBSTS0) 002916 0016 (6) Port P2 direction register (P2D) 000516 0016 (43) LPC control register (LPCCON) 002A16 0016 (7) Port P3 (P3) 000616 0016 (44) Data bus buffer register 1 (DBB1) 002B16 X X X X X X X X (8) Port P3 direction register (P3D) 000716 0016 (45) Data bus buffer status register 1 (DBBSTS1) 002C16 0016 (9) Port P4 (P4) 000816 0016 (46) Comparator data register (CMPD) 002D16 0016 (10) Port P4 direction register (P4D) 000916 0016 (47) Port control register 1 (PCTL1) 002E16 0016 (11) Port P5 (P5) 000A16 0016 (48) Port control register 2 (PCTL2) 002F16 0016 (12) Port P5 direction register (P5D) 000B16 0016 (49) PWM0H register (PWM0H) 003016 X X X X X X X X (13) Port P6 (P6) 000C16 0016 (50) PWM0L register (PWM0L) 003116 X 0 X X X X X X (14) Port P6 direction register (P6D) 000D16 0016 (51) PWM1H register (PWM1H) 003216 X X X X X X X X (15) Port P7 (P7) 000E16 0016 (52) PWM1L register (PWM1L) 003316 X 0 X X X X X X (16) Port P7 direction register (P7D) 000F16 0016 (53) AD/DA control register (ADCON) 003416 0 0 0 0 1 0 0 0 (17) Port P8 (P8) 001016 0016 (54) A-D conversion register 1 (AD1) 003516 X X X X X X X X (18) Port P8 direction register (P8D) 001116 0016 (55) D-A1 conversion register (DA1) 003616 0016 (19) I2C data shift register (S0) 001216 X X X X X X X X (56) D-A2 conversion register (DA2) 003716 0016 (57) A-D conversion register 2 (AD2) 003816 0 0 0 0 0 0 X X (58) Interrupt source selection register (INTSEL) 003916 0016 0016 (20) I2C address register (S0D) 001316 (21) I2C status register (S1) 001416 0 0 0 1 0 0 0 X (22) I2C control register (S1D) 001516 0016 (59) Interrupt edge selection register (INTEDGE) 003A16 (23) I2C clock control register (S2) 001616 0016 (60) CPU mode register (CPUM) 003B16 0 1 0 0 1 0 0 0 (24) I2C start/stop condition control register (S2D) 001716 0 0 0 1 1 0 1 0 0016 (61) Interrupt request register 1 (IREQ1) 003C16 0016 (25) Transmit/Receive buffer register (TB/RB) 001816 X X X X X X X X (62) Interrupt request register 2 (IREQ2) 003D16 0016 (26) Serial I/O status register (SIOSTS) 001916 1 0 0 0 0 0 0 0 (63) Interrupt control register 1 (ICON1) 003E16 0016 (27) Serial I/O control register (SIOCON) 001A16 (64) Interrupt control register 2 (ICON2) 003F16 0016 (28) UART control register (UARTCON) 001B16 1 1 1 0 0 0 0 0 (65) LPC0 address register L (LPC0ADL) 0FF016 0016 (29) Baud rate generator (BRG) 001C16 X X X X X X X X (66) LPC0 address register H (LPC0ADH) 0FF116 0016 0016 (30) Serialized IRQ control register (SERCON) 001D16 (67) LPC1 address register L (LPC1ADL) 0FF216 0016 (31) Watchdog timer control register (WDTCON) 001E16 0 0 1 1 1 1 1 1 (68) LPC1 address register H (LPC1ADH) 0FF316 0016 (32) Serialized IRQ request register (SERIRQ) 001F16 X X X X X X X X (69) Port P5 input register (P5I) 0FF816 0016 (33) Prescaler 12 (PRE12) 002016 FF16 (70) Port control register 3 (PCTL3) 0FF916 0016 (34) Timer 1 (T1) 0016 002116 0116 (71) Flash memory control register (FMCR) 0FFE16 X X X 0 0 0 0 1 (35) Timer 2 (T2) 002216 FF16 (72) Processor status register (PS) (36) Timer XY mode register (TM) 002316 0016 (73) Program counter (PCH) FFFD16 contents (37) Prescaler X (PREX) 002416 FF16 (PCL) FFFC16 contents Note : X : Not fixed Since the initial values for other than above mentioned registers and RAM contents are indefinite at reset, they must be set. Fig. 67 Internal status at reset 68 Address Register contents X X XX X 1 X X MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER CLOCK GENERATING CIRCUIT (2) Wait mode The 3885 group has two built-in oscillation circuits. An oscillation circuit can be formed by connecting a resonator between XIN and XOUT (XCIN and XCOUT). Use the circuit constants in accordance with the resonator manufacturer's recommended values. No external resistor is needed between XIN and XOUT since a feed-back resistor exists on-chip. However, an external feed-back resistor is needed between XCIN and XCOUT. Immediately after power on, only the XIN oscillation circuit starts oscillating, and XCIN and XCOUT pins function as I/O ports. If the WIT instruction is executed, the internal clock stops at an "H" level, but the oscillator does not stop. The internal clock restarts at reset or when an interrupt is received. Since the oscillator does not stop, normal operation can be started immediately after the clock is restarted. Frequency Control (1) Middle-speed mode XCIN The internal clock is the frequency of XIN divided by 8. After reset, this mode is selected. XCOUT Rf (2) High-speed mode CCIN XIN XOUT Rd CCOUT CIN COUT The internal clock is half the frequency of XIN. (3) Low-speed mode Fig. 68 Ceramic resonator circuit The internal clock is half the frequency of XCIN. Note If you switch the mode between middle/high-speed and lowspeed, stabilize both XIN and XCIN oscillations. The sufficient time is required for the sub clock to stabilize, especially immediately after power on and at returning from stop mode. When switching the mode between middle/high-speed and low-speed, set the frequency on condition that f(XIN) > 3f(XCIN). (4) Low power dissipation mode The low power consumption operation can be realized by stopping the main clock XIN in low-speed mode. To stop the main clock, set bit 5 of the CPU mode register to "1". When the main clock XIN is restarted (by setting the main clock stop bit to "0"), set sufficient time for oscillation to stabilize. XCIN XCOUT XIN XOUT Open Open External oscillation circuit External oscillation circuit VCC VSS VCC VSS Fig. 69 External clock input circuit Oscillation Control (1) Stop mode If the STP instruction is executed, the internal clock stops at an "H" level, and XIN and X CIN oscillators stop. When the oscillation stabilizing time set after STP instruction released bit is "0," the prescaler 12 is set to "FF16" and timer 1 is set to "0116". When the oscillation stabilizing time set after STP instruction released bit is "1", set the sufficient time for oscillation of used oscillator to stabilize since nothing is set to the prescaler 12 and timer 1. Either XIN or XCIN divided by 16 is input to the prescaler 12 as count source, and the output of the prescaler 12 is connected to timer 1. Set the timer 1 interrupt enable bit to disabled ("0") before executing the STP instruction. Oscillator restarts when an external interrupt is received, but the internal clock is not supplied to the CPU (remains at "H") until timer 1 underflows. The internal clock is supplied for the first time, when timer 1 underflows. Therefore make sure not to set the timer 1 interrupt request bit to "1" before the STP instruction stops the oscillator. When the oscillator is restarted by reset, apply "L" level to the RESET pin until the oscillation is stable since a wait time will not be generated. 69 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER XCOUT XCIN "0" "1" Port XC switch bit XOUT XIN Main clock division ratio selection bits (Note 1) Low-speed mode 1/2 1/4 Prescaler 12 1/2 High-speed or middle-speed mode Timer 1 Reset or 0116 STP instruction FF16 (Note 2) Main clock division ratio selection bits (Note1) Middle-speed mode Timing (internal clock) High-speed or low-speed mode Main clock stop bit Q S R S Q STP instruction WIT instruction R Q S R STP instruction Reset Interrupt disable flag l Interrupt request Notes 1: Either high-speed, middle-speed or low-speed mode is selected by bits 7 and 6 of the CPU mode register. When low-speed mode is selected, set port Xc switch bit (b4) to "1". 2: f(XIN)/16 is supplied as the count source to the Prescaler 12 at reset. When exciting STP instruction, the count source does not change either f(XIN))/16 or f(XCIN))/16 after releasing stop mode. Oscillation stabilizing time is not fixed "01FF16" when the bit 6 of PCTL2 is "1". Fig. 70 System clock generating circuit block diagram (Single-chip mode) 70 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Reset C "0 M4 CM " "1 6 " 1" " "0 " " "0 CM " 0" "1 M6 " C " "1 4 CM6 "1""0" C "0 M7 CM " "1 6 "1 " " "0 " CM4 "1""0" CM4 "1""0" CM7=0 CM6=1 CM5=0(8 MHz oscillating) CM4=0(32 kHz stopped) Middle-speed mode (f()=1 MHz) CM7=0 CM6=1 CM5=0(8 MHz oscillating) CM4=1(32 kHz oscillating) High-speed mode (f()=4 MHz) CM7=0 CM6=0 CM5=0(8 MHz oscillating) CM4=0(32 kHz stopped) CM6 "1""0" High-speed mode (f()=4 MHz) CM7=0 CM6=0 CM5=0(8 MHz oscillating) CM4=1(32 kHz oscillating) CM7 "1""0" Middle-speed mode (f()=1 MHz) Low-speed mode (f()=16 kHz) CM5 "1""0" CM7=1 CM6=0 CM5=0(8 MHz oscillating) CM4=1(32 kHz oscillating) Low-speed mode (f()=16 kHz) CM7=1 CM6=0 CM5=1(8 MHz stopped) CM4=1(32 kHz oscillating) b7 b4 CPU mode register (CPUM : address 003B16) CM4 : Port Xc switch bit 0 : I/O port function (stop oscillating) 1 : XCIN-XCOUT oscillating function CM5 : Main clock (XIN- XOUT) stop bit 0 : Operating 1 : Stopped CM7, CM6: Main clock division ratio selection bit b7 b6 0 0 : = f(XIN)/2 ( High-speed mode) 0 1 : = f(XIN)/8 (Middle-speed mode) 1 0 : = f(XCIN)/2 (Low-speed mode) 1 1 : Not available Notes 1 : Switch the mode by the allows shown between the mode blocks. (Do not switch between the modes directly without an allow.) 2 : The all modes can be switched to the stop mode or the wait mode and return to the source mode when the stop mode or the wait mode is ended. 3 : Timer operates in the wait mode. 4 : When the stop mode is ended, a delay of approximately 1 ms occurs by connecting prescaler 12 and Timer 1 in middle/high-speed mode. 5 : When the stop mode is ended, a delay of approximately 0.25 s occurs by Timer 1 and Timer 2 in low-speed mode. 6 : Wait until oscillation stabilizes after oscillating the main clock XIN before the switching from the low-speed mode to middle/high-speed mode. 7 : The example assumes that 8 MHz is being applied to the XIN pin and 32 kHz to the XCIN pin. indicates the internal clock. Fig. 71 State transitions of system clock 71 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER FLASH MEMORY MODE The 3885 (flash memory version) has an internal new DINOR flash memory that can be reprogrammed with 2 power sources when VCC is 3.3 V. For this flash memory , two flash memory modes are available in which to read, program, and erase: parallel I/O and a CPU reprogram mode in which the flash memory can be manipulated by the Central Processing Unit (CPU). Each mode is detailed in the pages to follow. The flash memory of the 3885 is divided into User ROM area and Boot ROM area as shown in Figure 72. In addition to the ordinary user ROM area to store a microcomputer operation control program, 3885 program has a Boot ROM area that is used to store a program to control reprogramming in CPU reprogram mode. The user can store a reprogram control software in this area that suits the user's application system. This Boot ROM area can be reprogrammed in only parallel I/O mode. Parallel I/O mode 100016 Block 1 : 28 Kbyte 800016 Block 0 : 32Kbyte FFFF16 F00016 4 Kbyte FFFF16 User ROM area Boot ROM area BSEL = 0 BSEL = 1 CPU reprogram mode 100016 Block 1 : 28 Kbyte 800016 Block 0 : 32 Kbyte Product name Flash memory start address M38859FF 100016 FFFF16 F00016 4 Kbyte FFFF16 User ROM area User area / Boot area selection bit = 0 Boot ROM area User area / Boot area selection bit = 1 Notes 1: The Boot ROM area can be rewritten in only parallel input/ output mode. 2: To specify a block, use the maximum address in the block. Fig. 72 Block diagram of flash memory version 72 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Parallel I/O Mode Bus Operation Modes The parallel I/O mode is entered by making connections shown in Figures 73 and then turning the Vcc power supply on. Read Address The user ROM is divided into two blocks as shown in Figure 72. The block address referred to in this data sheet is the maximum address value of each block. User ROM and Boot ROM Areas In parallel I/O mode, the user ROM and boot ROM areas shown in Figure 72 can be rewritten. The BSEL pin is used to choose between these two areas. The user ROM area is selected by pulling the BSEL input low; the boot ROM area is selected by driving the BSEL input high. Both areas of flash memory can be operated on in the same way. Program and block erase operations can be performed in the user ROM area. The user ROM area and its blocks are shown in Figure 72. The user ROM area is 60 Kbytes in size. In parallel I/O mode, it is located at addresses 100016 through FFFF16. The boot ROM area is 4 Kbytes in size. In parallel I/O mode, it is located at addresses F00016 through FFFF16. Make sure program and block erase operations are always performed within this address range. (Access to any location outside this address range is prohibited.) In the Boot ROM area, an erase block operation is applied to only one 4 Kbyte block. Functional Outline (Parallel I/O Mode) In parallel I/O mode, bus operation modes--Read, Output Disable, Standby, Write, and Deep Power Down--are selected by the status _____ _____ _____ _____ of the CE, OE, WE, and RP input pins. The contents of erase, program, and other operations are selected by writing a software command. The data, status register, etc. in memory can only be read out by a read after software command input. Program and erase operations are controlled using software commands. The following explains about bus operation modes, software commands, and status register. _____ _____ The Read mode is entered by pulling the OE pin low when the CE _____ _____ pin is low and the WE and RP pins are high. There are two read modes: array, and status register, which are selected by software command input. In read mode, the data corresponding to each software command entered is output from the data I/O pins D0-D7. The read array mode is automatically selected when the device is powered on or after it exits deep power down mode. Output Disable _____ The output disable mode is entered by pulling the CE pin low and the _____ _____ _____ WE, OE, and RP pins high. Also, the data I/O pins are placed in the high-impedance state. Standby _____ _____ The standby mode is entered by driving the CE pin high when the RP pin is high. Also, the data I/O pins are placed in the high-impedance _____ state. However, if the CE pin is set high during erase or program operation, the internal control circuit does not halt immediately and normal power consumption is required until the operation under way is completed. Write _____ _____ The write mode is entered by pulling the WE pin low when the CE pin _____ _____ is low and the OE and RP pins are high. In this mode, the device accepts the software commands or write data entered from the data I/O pins. A program, erase, or some other operation is initiated depending on the content of the software command entered here. The input data such as address and software command is latched at the _____ _____ rising edge of WE or CE whichever occurs earlier. Deep Power Down _____ The deep power down is entered by pulling the RP pin low. Also, the data I/O pins are placed in the high-impedance state. When the device is freed from deep power down mode, the read array mode is selected and the content of the status register is set to "8016." If the _____ RP pin is pulled low during erase or program operation, the operation under way is canceled and the data in the relevant block becomes invalid. Table 19 Relationship between control signals and bus operation modes Pin name _____ _____ ______ _____ CE OE WE RP Array VIL VIL VIH VIH Data output Status register VIL VIL VIL VIH VIH VIH VIH VIH Status register data output Hi-z Program VIH VIL X VIH X VIL VIH VIH Hi-z Command/data input Erase Other VIL VIL VIH VIH VIL VIL VIH VIH Command input Command input X X X VIL Hi-z Mode Read Output disabled Stand by Write Deep power down D0 to D7 Note : X can be VIL or VIH. 73 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Table 20 Description of Pin Function (Flash Memory Parallel I/O Mode) Pin name Signal name Function I/O VCC,VSS Power supply input I Apply 3.0 0.3 V to the Vcc pin and 0 V to the Vss pin. CNVSS Power suppy input I Connect to Vpp = 5V 0.5V. RESET Reset input I Input "L" level. XIN Clock input I XOUT Clock output O Connect a ceramic or crystal resonator between the XIN and XOUT pins. When entering an externally derived clock, enter it from XIN and leave XOUT open. AVSS Analog power supply input I Connect to Vss. VREF Reference voltage input I Connect to Vss. P00 to P07 Address input A0 to A7 I This is address A0-A7 input pins. P10 to P17 Address input A8 to A15 I These are address A8-A15 input pins. P20 to P27 Data I/O D0 to D7 P30 Input P30 I Input "H" or "L" or keep open. P31 BSEL input I This is a BSEL input pin. P32 Input P32 I Input "H" or "L" or keep open. P33 WE input I This is a WE input pin. P34 RP input I This is a RP input pin. P35 RY/BY output O This is a RY/BY output pin. P36 CE input I This is a CE input pin. P37 OE input I This is a OE input pin. P40 to P45 Input P40 to P45 I Input "H" or "L" or keep open. P46 Flash mode Input I Connect "L" for Pallarel I/O mode. P47 Input P47 I Input "H" or "L" or keep open. P50 to P57 Input P5 I Input "H" or "L" or keep open. P60 to P67 Input P6 I Input "H" or "L" or keep open. P70 to P77 Input P7 I Input "H" or "L" or keep open. P80 to P87 Input P8 I Input "H" or "L" or keep open. 74 I/O These are data D0-D7 input/output pins. MITSUBISHI MICROCOMPUTERS 3885 Group A13 A11 A12 A10 A7 A8 A9 A5 A6 A3 A4 A2 A0 A1 CE OE RP 41 44 43 42 46 45 50 49 48 47 40 61 62 63 64 65 66 67 68 69 70 39 38 37 36 35 34 33 32 31 30 29 28 M38859FFHP 71 72 73 74 75 76 77 78 79 80 A14 A15 D0 D1 D2 D3 D4 D5 D6 D7 Vss * Vpp 20 19 18 17 16 15 14 13 12 11 9 10 6 7 8 4 5 P16 P17/CMPREF P20 P21 P22 P23 P24(LED0) P25(LED1) P26(LED2) P27(LED3) VSS XOUT XIN P40/XCOUT P41/XCIN RESET CNVSS P42/INT0 P43/INT1 P44/RXD P60/AN0 P77/SCL P76/SDA P75/INT41 P74/INT31 P73/INT21 P72 P71 RY/BY P70 P57/DA2/PWM11 P56/DA1/PWM01 P55/CNTR1 P54/CNTR0 P53/INT40 P52/INT30 P51/INT20 P50/INT5 P47/SRDY/CLKRUN# P46/SCLK P45/TXD 3 27 26 25 24 23 22 21 1 Vcc P31/PWM10 P30/PWM00 P87/SERIRQ P86/LCLK P85/LRESET# P84/LFRAME# P83/LAD3 P82/LAD2 P81/LAD1 P80/LAD0 VCC VREF AVSS P67/AN7 P66/AN6 P65/AN5 P64/AN4 P63/AN3 P62/AN2 P61/AN1 2 BSEL 57 56 55 54 53 52 51 60 59 58 P32 P33 P34 P35 P36 P37 P00 P01 P02 P03 P04 P05 P06 P07 P10 P11 P12 P13 P14 P15 WE SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Mode setup method Signal CNVSS P46/SCLK RESET :Connect to the ceramic oscillation circuit. indicates the flash memory pin. Value Vpp VSS VSS Fig. 73 Pin connection diagram in parallel I/O mode 75 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Software Commands Read Status Register Command (7016) Table 21 lists the software commands. By entering a software command from the data I/O pins (D0-D7) in Write mode, specify the content of the operation, such as erase or program operation, to be performed. The following explains the content of each software command. When the command code "7016" is written in the first bus cycle, the content of the status register is output from the data I/O pins (D0-D7) by a read in the second bus cycle. Since the content of the status _____ _____ _____ _____ register is updated at the falling edge of OE or CE, the OE or CE signal must be asserted each time the status is read. The status register is explained in the next section. Read Array Command (FF16) The read array mode is entered by writing the command code "FF16" in the first bus cycle. When an address to be read is input in one of the bus cycles that follow, the content of the specified address is output from the data I/O pins (D0-D7). The read array mode is retained intact until another command is written. The read array mode is also selected automatically when the device is powered on and after it exits deep power down mode. Clear Status Register Command (5016) This command is used to clear the bits SR4,SR5 of the status register after they have been set. These bits indicate that operation has ended in an error. To use this command, write the command code "5016" in the first bus cycle. Table 21 Software command list (parallel I/O mode) Second bus cycle First bus cycle Command Cycle number Mode (D0 to D7) Mode Data Address (D0 to D7) X SRD(Note 1) Read array Read status register 1 2 Write Write X(Note 4) X FF16 7016 Read Clear status register Program 1 2 Write Write X X 5016 4016 Write WA(Note 2) WD(Note 2) Block erase 2 Write X 2016 Write BA(Note 3) Notes 1: SRD = Status Register Data 2: WA = Write Address, WD = Write Data 3: BA = Block Address (Enter the maximum address of each block) 4: X denotes a given address in the user ROM area or boot ROM area. 76 Data Address D016 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Program Command (4016) Block Erase Command (2016/D016) The program operation starts when the command code "4016" is written in the first bus cycle. Then, if the address and data to program are written in the 2nd bus cycle, program operation (data programming and verification) will start. Whether the write operation is completed can be confirmed by read_____ ing the status register or the RY/BY signal status. When the program starts, the read status register mode is accessed automatically and the content of the status register can be read out from the data bus (D0-D7). The status register bit 7 (SR7) is set to "0" at the same time the write operation starts and is returned to "1" upon completion of the write operation. In this case, the read status register mode remains active until the read array command (FF16) is written. ____ The RY/BY pin is "L" during write operation and "H" when the write operation is completed as is the status register bit 7. At program end, program results can be checked by reading the status register. By writing the command code "2016" in the first bus cycle and the confirmation command code "D016" in the second bus cycle that follows to the block address of a flash memory block, the system initiates a block erase (erase and erase verify) operation. Whether the block erase operation is completed can be confirmed ____ by reading the status register or the RY/BY signal. At the same time the block erase operation starts, the read status register mode is automatically entered, so the content of the status register can be read out. The status register bit 7 (SR7) is set to "0" at the same time the block erase operation starts and is returned to "1" upon completion of the block erase operation. In this case, the read status register mode remains active until the read array command (FF16) is written. ____ The RY/BY pin is "L" during block erase operation and "H" when the block erase operation is completed as is the status register bit 7. After the block erase operation is completed, the status register can be read out to know the result of the block erase operation. For details, refer to the section where the status register is detailed. Start Start Write 4016 Write 2016 Write Write address Write data Write Status register read SR7=1? or RY/BY=1? D016 Block address Status register read NO SR7=1? or RY/BY=1? NO YES YES NO SR4=0? Program error NO SR5=0? Erase error YES Program completed In this case, the read status register mode remains active until the read array command (FF16) is written. Fig. 74 Page program flowchart YES Erase completed In this case, the read status register mode remains active until the read array command (FF16) is written. Fig. 75 Block erase flowchart 77 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Status Register Program Status (SR4) The status register indicates status such as whether an erase operation or a program ended successfully or in error. It can be read under the following conditions. (1) In the read array mode when the read status register command (7016) is written and the block address is subsequently read. (2) In the period from when the program write or auto erase starts to when the read array command (FF16) The program status reports the operating status of the write operation. If a write error occurs, it is set to "1". When the program status is cleared, it is set to "0". If "1" is written for any of the SR5, SR4 bits, the program erase all blocks, block erase, commands are not accepted. Before executing these commands, execute the clear status register command (5016) and clear the status register. Also, any commands are not correct, both SR5 and SR4 are set to "1". The status register is cleared in the following situations. (1) By writing the clear status register command (5016) (2) In the deep power down mode (3) In the power supply off state Table 22 gives the definition of each status register bit. When power is turned on or returning from the deep power down mode, the status register outputs "8016". Full Status Check Results from executed erase and program operations can be known by running a full status check. Figure 76 shows a flowchart of the full status check and explains how to remedy errors which occur. ____ Ready/Busy (RY/BY) pin ____ Sequencer status (SR7) The sequencer status indicates the operating status of the flash memory. When power is turned on or returning from the deep power down mode, "1" is set for it. This bit is "0" (busy) during the write or erase operations and becomes "1" when these operations ends. The RY/BY pin is an output pin (N-chanel open drain output) which, like the sequencer status (SR7), indicates the operating status of the flash memory. It is "L" level during auto program or auto erase operations and becomes to the high impedance state (ready state) when ____ these operations end. The RY/BY pin requires an external pull-up. Erase Status (SR5) The erase status reports the operating status of the erase operation. If an erase error occurs, it is set to "1". When the erase status is cleared, it is set to "0". Table 22 Status register 78 Each bit of SRD0 bits SR7 (D7) Sequencer status SR6 (D6) SR5 (D5) Status name Definition "1" "0" Ready Busy Reserved Erase status Ended in error Ended successfully SR4 (D4) SR3 (D3) Program status Reserved Ended in error - Ended successfully - SR2 (D2) SR1 (D1) Reserved Reserved - - SR0 (D0) Reserved - - MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Read status register SR4=1 and SR5 =1 ? YES Command sequence error NO SR5=0? NO Block erase error Execute the clear status register command (5016) to clear the status register. Try performing the operation one more time after confirming that the command is entered correctly. Should a block erase error occur, the block in error cannot be used. YES SR4=0? NO Program error Should a program error occur, the block in error cannot be used. YES End (block erase, program) Note: When one of SR5 to SR4 is set to "1" , none of the program, all blocks erase, or block erase is accepted. Execute the clear status register command (5016) before executing these commands. Fig. 76 Full status check flowchart and remedial procedure for errors 79 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER CPU Reprogram Mode In CPU reprogram mode, the on-chip flash memory can be operated on (read, program, or erase) under control of the Central Processing Unit (CPU). In CPU reprogram mode, only the user ROM area shown in Figure 72 can be reprogrammed; the Boot ROM area cannot be reprogrammed. Make sure the program and block erase commands are issued for only the user ROM area. The control program for CPU reprogram mode can be stored in either user ROM or Boot ROM area. In the CPU reprogram mode, because the flash memory cannot be read from the CPU, the reprogram control software must be transferred to internal RAM area before it can be executed. Microcomputer Mode and Boot Mode The control software for CPU reprogram mode must be programed into the user ROM or Boot ROM area in parallel I/O mode beforehand. (If the control software is programed into the Boot ROM area, the standard serial I/O mode becomes unusable.) See Figure 72 for details about the Boot ROM area. Normal microcomputer mode is entered when the microcomputer is released from reset with pulling CNVSS pin low. In this case, the CPU starts operating using the control software in the user ROM area. When the microcomputer is released from reset by pulling the P46/ SCLK pin high, the CNVSS pin high, the CPU starts operating using the control software in the Boot ROM area (program start address should be stored FFFC16, FFFD16). This mode is called the "boot mode". Block Address Block addresses refer to the maximum address of each block. These addresses are used in the block erase command. In case of the M38859FF, these are two block. Outline Performance (CPU Reprogram Mode) In the CPU reprogram mode, the CPU erases, programs and reads the internal flash memory as instructed by software commands. This reprogram control software must be transferred to internal RAM before it can be executed. The CPU reprogram mode is accessed by applying 5V 10% to the CNVSS pin and writing "1" for the CPU reprogram mode select bit (bit 1 in address 0FFE16). Software commands are accepted once the mode is accessed. Use software commands to control software and erase operations. Whether a program or erase operation has terminated normally or in error can be verified by reading the status register. Figure 77 shows the flash memory control register. _____ Bit 0 is the RY/BY status flag used exclusively to read the operating status of the flash memory. During programming and erase operations, it is "0". Otherwise, it is "1". Bit 1 is the CPU reprogram mode select bit. When this bit is set to "1" and 5V 10% are applied to the CNVSS pin, the M38859FF enters the CPU reprogram mode. Software commands are accepted once the mode is accessed. In CPU reprogram mode, the CPU becomes unable to access the internal flash memory. Therefore, use the con- 80 trol software in RAM for write to bit 1. To set this bit to "1", it is necessary to write "0" and then write "1" in succession. The bit can be set to "0" by only writing a "0". Bit 2 is the CPU reprogram mode entry flag. This bit can be read to check whether the CPU reprogram mode has been entered or not. Bit 3 is the flash memory reset bit used to reset the control circuit of the internal flash memory. This bit is used when exiting CPU reprogram mode and when flash memory access has failed. When the CPU reprogram mode select bit is "1", writing "1" for this bit resets the control circuit. To release the reset, it is necessary to set this bit to "0". Bit 4 is the User area/Boot area selection bit. When this bit is set to "1", Boot ROM area is accessed, and CPU reprogram mode in Boot ROM area is available. In boot mode, this bit is set "1" automatically. To set and clear this bit must be operated in RAM area. Figure 78 shows a flowchart for setting/releasing the CPU reprogram mode. Notes on CPU Reprogram Mode Described below are the precautions to be observed when reprogram the flash memory in CPU reprogram mode. (1) Operation speed During CPU reprogram mode, set the internal clock frequency 4MHz or less using the main clock division ratio selection bits (bit 6,7 at 003B16). (2) Instructions inhibited against use The instructions which refer to the internal data of the flash memory cannot be used during CPU reprogram mode . (3) Interrupts inhibited against use The interrupts cannot be used during CPU reprogram mode because they refer to the internal data of the flash memory. (4) Watchdog timer In case of the watchdog timer has been running already, the internal reset generated by watchdog timer underflow does not happen, because of watchdog timer is always clearing during program or erase operation. (5) Reset Reset is always valid. In case of CNVSS = "H" when reset is released, boot mode is active. So the program starts from the address contained in address FFFC16 and FFFD16 in boot ROM area. MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER b7 b0 Flash memory control register (address 0FFE16) FMCR RY/BY status flag (FMCR0) 0: Busy (being programmed or erased) 1: Ready CPU reprogram mode select bit (FMCR1) (Note 2) 0: Normal mode (Software commands invalid) 1: CPU rewrite mode (Software commands acceptable) CPU reprogram mode entry flag (FMCR2) 0: Normal mode 1: CPU rewrite mode Flash memory reset bit (FMCR3) (Note 3) 0: Normal operation 1: Reset User ROM area / Boot ROM area select bit (FMCR4) (Note 4) 0: User ROM area accessed 1: Boot ROM area accessed Reserved bits (Indefinite at read/ "0" at write) Notes 1: The contents of flash memory control register are "XXX00001" just after reset release. 2: For this bit to be set to "1", the user needs to write "0" and then "1" to it in succession. If it is not this procedure, this bit will not be set to "1". Additionally, it is required to ensure that no interrupt will be generated during that interval. Use the control program in the area except the built-in flash memory for write to this bit. 3: This bit is valid when the CPU rewrite mode select bit is "1". Set this bit 3 to "0" subsequently after setting bit 3 to "1". 4: Use the control program in the area except the built-in flash memory for write to this bit. Fig. 77 Flash memory control registers Program in ROM Program in RAM Start *1 Single-chip mode, or boot mode Set CPU reprogram mode select bit to "1" (by writing "0" and then "1" in succession)(Note 3) Set CPU mode register (Note 1) Transfer CPU reprogram mode control program to internal RAM Jump to transferred control program in RAM (Subsequent operations are executed by control program in this RAM) Check the CPU reprogram mode entry flag Using software command execute erase, program, or other operation Execute read array command or reset flash memory by setting flash memory reset bit (by writing "1" and then "0" in succession) (Note 2) *1 Write "0" to CPU reprogram mode select bit End Notes 1: Set bit 6,7 (Main clock division ratio selection bits ) at CPU mode register (003B16). 2: Before exiting the CPU reprogram mode after completing erase or program operation, always be sure to execute a read array command or reset the flash memory. Fig. 78 CPU rewrite mode set/reset flowchart 81 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Software Commands Read Status Register Command (7016) Table 23 lists the software commands. After setting the CPU reprogram mode select bit to "1", write a software command to specify an erase or program operation. The content of each software command is explained below. When the command code "7016" is written in the first bus cycle, the content of the status register is read out at the data bus (D0-D7) by a read in the second bus cycle. The status register is explained in the next section. Read Array Command (FF16) Clear Status Register Command (5016) The read array mode is entered by writing the command code "FF16" in the first bus cycle. When an address to be read is input in next bus cycles, the content of the specified address is read out at the data bus (D0-D7). The read array mode is retained intact until another command is written. And after power on and after recover from deep power down mode, this mode is selected also. This command is used to clear the bits SR1,SR4 and SR5 of the status register after they have been set. These bits indicate that operation has ended in an error. To use this command, write the command code "5016" in the first bus cycle. Table 23 List of software commands (CPU rewrite mode) First bus cycle Command Cycle number Mode Address Second bus cycle Data (D0 to D7) Mode Address Data (D0 to D7) Read X SRD (Note 1) Read array 1 Write Read status register 2 Write X 7016 Clear status register 1 Write X 5016 Program 2 Write X 4016 Write WA Block erase 2 Write X 2016 Write BA (Note 3) X (Note 4) Note 1: SRD = Status Register Data 2: WA = Write Address, WD = Write Data 3: BA = Block Address (Enter the maximum address of each block.) 4: X denotes a given address in the user ROM area . 82 F F1 6 (Note 2) WD (Note 2) D016 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Program Command (4016) Block Erase Command (2016/D016) Program operation starts when the command code "4016" is written in the first bus cycle. Then, if the address and data to program are written in the 2nd bus cycle, program operation (data programming and verification) will start. Whether the program operation is completed can be confirmed by _____ reading the status register or the RY/BY status flag. When the program starts, the read status register mode is accessed automatically and the content of the status register is read into the data bus (D0- D7). The status register bit 7 (SR7) is set to "0" at the same time the program operation starts and is returned to "1" upon completion of the program operation. In this case, the read status register mode remains active until the read array command (FF16) is written. ____ The RY/BY status flag is "0" during program operation and "1" when the program operation is completed as is the status register bit 7. At program end, program results can be checked by reading the status register. By writing the command code "2016" in the first bus cycle and the confirmation command code "D016" in the second bus cycle that follows to the block address of a flash memory block, the system initiates a block erase (erase and erase verify) operation. Whether the block erase operation is completed can be confirmed ____ by reading the status register or the RY/BY status flag. At the same time the block erase operation starts, the read status register mode is automatically entered, so the content of the status register can be read out. The status register bit 7 (SR7) is set to "0" at the same time the block erase operation starts and is returned to "1" upon completion of the block erase operation. In this case, the read status register mode remains active until the read array command (FF16) is written. ____ The RY/BY status flag is "0" during block erase operation and "1" when the block erase operation is completed as is the status register bit 7. After the block erase operation is completed, the status register can be read out to know the result of the block erase operation. For details, refer to the section where the status register is detailed. Start Start Write 4016 Write 2016 Write Program address Program data Write Status register read SR7=1? or RY/BY=1? Status register read NO SR7=1? or RY/BY=1? YES SR4=0? YES Program completed Fig. 79 Program flowchart D016 Block address NO YES NO Program error SR5=0? NO Erase error YES Erase completed Fig. 80 Erase flowchart 83 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Status Register Sequencer status (SR7) The status register shows the operating state of the flash memory and whether erase operations and programs ended successfully or in error. It can be read in the following ways. (1) By reading an arbitrary address from the user ROM area after writing the read status register command (7016) (2) By reading an arbitrary address from the user ROM area in the period from when the program starts or erase operation starts to when the read array command (FF16) is input After power-on, and after recover from deep power down mode, the sequencer status is set to "1"(ready). The sequencer status indicates the operating status of the device. This status bit is set to "0" (busy) during program or erase operation and is set to "1" upon completion of these operations. Table 24 shows the status register. Also, the status register can be cleared in the following way. (1) By writing the clear status register command (5016) (2) In the deep power down mode (3) In the power supply off state After a reset, the status register is set to "8016". Each bit in this register is explained below. Erase status (SR5) The erase status informs the operating status of erase operation to the CPU. When an erase error occurs, it is set to "1". The erase status is reset to "0" when cleared. Program status (SR4) The program status informs the operating status of write operation to the CPU. When a write error occurs, it is set to "1". The program status is reset to "0" when cleared. If "1" is set for any of the SR5 or SR4 bits, the program, erase all blocks, and block erase commands are not accepted. Before executing these commands, execute the clear status register command (5016) and clear the status register. Also, any commands are not correct, both SR5 and SR4 are set to "1". Table 24 Definition of each bit in status register 84 Each bit of SRD0 bits SR7 (bit7) Sequencer status SR6 (bit6) SR5 (bit5) Status name Definition "1" "0" Ready Busy Reserved Erase status Terminated in error Terminated normally SR4 (bit4) SR3 (bit3) Program status Reserved Terminated in error - Terminated normally - SR2 (bit2) SR1 (bit1) Reserved Reserved - - SR0 (bit0) Reserved - - MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Full Status Check By performing full status check, it is possible to know the execution results of erase and program operations. Figure 81 shows a full status check flowchart and the action to be taken when each error occurs. Read status register SR4=1 and SR5 =1 ? YES Command sequence error NO SR5=0? NO Block erase error Execute the clear status register command (5016) to clear the status register. Try performing the operation one more time after confirming that the command is entered correctly. Should a block erase error occur, the block in error cannot be used. YES SR4=0? NO Program error Should a program error occur, the block in error cannot be used. YES End (block erase, program) Note: When one of SR5 to SR4 is set to "1" , none of the program, erase all blocks, and block erase commands is accepted. Execute the clear status register command (5016) before executing these commands. Fig. 81 Full status check flowchart and remedial procedure for errors 85 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Functions To Inhibit Rewriting Flash Memory To prevent the contents of the flash memory data from being read out or rewritten easily, the device incorporates a ROM code protect function for use in parallel I/O mode. ROM code protect function The ROM code protect function is the function inhibit reading out or modifying the contents of the flash memory version by using the ROM code protect control address (FFDB16) during parallel I/O mode. Figure 82 shows the ROM code protect control address (FFDB16). (This address exists in the user ROM area.) If one of the pair of ROM code protect bits is set to "0", ROM code b7 protect is turned on, so that the contents of the flash memory data are protected against readout and reprogram. ROM code protect is implemented in two levels. If level 2 is selected, the flash memory is protected even against readout by a manufactures inspection test also. When an attempt is made to select both level 1 and level 2, level 2 is selected by default. If both of the two ROM code protect reset bits are set to "00", ROM code protect is turned off, so that the contents of the flash memory data can be read out or reprogram. Once ROM code protect is turned on, the contents of the ROM code protect reset bits cannot be modified in parallel I/O mode. Use CPU reprogram mode to reprogram the contents of the ROM code protect reset bits. b0 1 1 ROM code protect control (address FFDB16) (Note 1) ROMCP Reserved bits ("1" at read/write) ROM code protect level 2 set bits (ROMCP2) (Notes 2, 3) b3b2 0 0: Protect enabled 0 1: Protect enabled 1 0: Protect enabled 1 1: Protect disabled ROM code protect reset bits (ROMCR) (Note 4) b5b4 0 0: Protect removed 0 1: Protect set bits effective 1 0: Protect set bits effective 1 1: Protect set bits effective ROM code protect level 1 set bits (ROMCP1) (Note 2) b7b6 0 0: Protect enabled 0 1: Protect enabled 1 0: Protect enabled 1 1: Protect disabled Notes 1: The contents of ROM code protect control register are "FF16" just after reset release. This area is on the ROM in the mask ROM version. 2: When ROM code protect is turned on, the internal flash memory is protected against readout or modification in parallel I/O mode. 3: When ROM code protect level 2 is turned on, ROM code readout by a shipment inspection LSI tester, etc. also is inhibited. 4: The ROM code protect reset bits can be used to turn off ROM code protect level 1 and ROM code protect level 2. However, since these bits cannot be modified in parallel I/O mode, they need to be rewritten in standard serial I/O mode or CPU rewrite mode. Fig. 82 ROM code protect control address 86 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Flash Memory Electrical Characteristics Table 25 Flash memory mode Electrical characteristics (Ta = 25oC, Vcc = 3.3 0.3V unless otherwise noted) Limits Symbol IPP1 IPP2 IPP3 VIL VIH VPP Parameter VPP power source current (read) VPP power source current (program) VPP power source current (erase) "L" input voltage (Note) "H" input voltage (Note) VPP power source voltage Test conditions Min. 0 2.0 4.5 Typ. Max. 100 60 30 0.8 VCC 5.5 Unit A mA mA V V V Note: Input pins for parallel I/O mode. 87 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER NOTES ON PROGRAMMING Processor Status Register The contents of the processor status register (PS) after a reset are undefined, except for the interrupt disable flag (I) which is "1". After a reset, initialize flags which affect program execution. In particular, it is essential to initialize the index X mode (T) and the decimal mode (D) flags because of their effect on calculations. Interrupts The contents of the interrupt request bits do not change immediately after they have been written. After writing to an interrupt request register, execute at least one instruction before performing a BBC or BBS instruction. Decimal Calculations * To calculate in decimal notation, set the decimal mode flag (D) to "1", then execute an ADC or SBC instruction. After executing an ADC or SBC instruction, execute at least one instruction before executing a SEC, CLC, or CLD instruction. * In decimal mode, the values of the negative (N), overflow (V), and zero (Z) flags are invalid. Serial I/O In clock synchronous serial I/O, if the receive side is using an external clock and it is to output the S RDY signal, set the transmit enable bit, the receive enable bit, and the SRDY output enable bit to "1". Serial I/O continues to output the final bit from the TX D pin after transmission is completed. In clock-synchronous mode, an external clock is used as synchronous clock, write transmission data to the transmit buffer register during transfer clock is "H". A-D Converter The comparator uses capacitive coupling amplifier whose charge will be lost if the clock frequency is too low. Therefore, make sure that f(XIN) is at least on 500 kHz during an A-D conversion. Do not execute the STP or WIT instruction during an A-D conversion. D-A Converter When a D-A converter is not used, set all values of D-Ai conversion registers (i=1, 2) to "0016". Timers Instruction Execution Time If a value n (between 0 and 255) is written to a timer latch, the frequency division ratio is 1/(n+1). The instruction execution time is obtained by multiplying the period of the internal clock by the number of cycles needed to execute an instruction. The number of cycles required to execute an instruction is shown in the list of machine instructions. The period of the internal clock is twice of the XIN period in highspeed mode. Multiplication and Division Instructions * The index X mode (T) and the decimal mode (D) flags do not affect the MUL and DIV instruction. * The execution of these instructions does not change the contents of the processor status register. Ports The contents of the port direction registers cannot be read. The following cannot be used: * The data transfer instruction (LDA, etc.) * The operation instruction when the index X mode flag (T) is "1" * The instruction with the addressing mode which uses the value of a direction register as an index * The bit-test instruction (BBC or BBS, etc.) to a direction register * The read-modify-write instructions (ROR, CLB, or SEB, etc.) to a direction register. Use instructions such as LDM and STA, etc., to set the port direction registers. 88 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER NOTES ON USAGE Handling of Power Source Pins In order to avoid a latch-up occurrence, connect a capacitor suitable for high frequencies as bypass capacitor between power source pin (V CC pin) and GND pin (V SS pin), between power source pin (VCC pin) and analog power source input pin (AVSS pin), and between program power source pin (CNVss/V PP) and GND pin for flash memory version when on-board reprogramming is executed. Besides, connect the capacitor to as close as possible. For bypass capacitor which should not be located too far from the pins to be connected, a ceramic capacitor of 0.01 F-0.1 F is recommended. Flash Memory Version The CNVSS pin is connected to the internal memory circuit block by a low-ohmic resistance, since it has the multiplexed function to be a programmable power source pin (VPP pin) as well. To improve the noise reduction, connect a track between CNVSS pin and VSS pin with 1 to 10 k resistance. For the mask ROM version, there is no operational interference even if CNVSS pin is connected to Vss pin via a resistor. Electric Characteristic Differences Between Mask ROM and Flash Memory Version MCUs There are differences in electric characteristics, operation margin, noise immunity, and noise radiation between Mask ROM and Flash Memory version MCUs due to the difference in the manufacturing processes. When manufacturing an application system with the Flash Memory version and then switching to use of the Mask ROM version, please perform sufficient evaluations for the commercial samples of the Mask ROM version. DATA REQUIRED FOR MASK ORDERS The following are necessary when ordering a mask ROM production: 1. Mask ROM Order Confirmation Form 2. Mark Specification Form 3. Data to be written to ROM, in EPROM form (three identical copies) or one floppy disk. For the mask ROM confirmation and the mark specifications, refer to the "Mitsubishi MCU Technical Information" Homepage: http://www.infomicom.maec.co.jp/indexe.htm 89 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER ELECTRICAL CHARACTERISTICS Table 26 Absolute maximum ratings Symbol VCC VI VI VI VI VO VO Pd Topr Tstg Parameter Power source voltages Input voltage P00-P07, P10-P17, P20-P27, P30-P37, P40-P47, P50-P57, P60-P67, P80-P87, VREF RESET, XIN Input voltage P70-P77 Input voltage CNVSS (Note 1) Input voltage CNVSS (Note 2) Output voltage P00-P07, P10-P17, P20-P27, P30-P37, P40-P47, P50-P57, P60-P67, P80-P87, XOUT Output voltage P70-P77 Power dissipation Operating temperature Storage temperature Conditions All voltages are based on VSS. Output transistors are cut off. Ratings -0.3 to 4.6 Unit V -0.3 to VCC +0.3 V -0.3 to 5.8 -0.3 to 6.5 -0.3 to VCC +0.3 V V V -0.3 to VCC +0.3 V -0.3 to 5.8 500 -20 to 85 -40 to 125 V mW C C Ta = 25 C Notes 1: Flash memory version 2: Mask ROM version Table 27 Recommended operating conditions (VCC = 3.3 V 0.3V, Ta = -20 to 85 C, unless otherwise noted) Symbol Parameter VCC Power source voltage VSS Power source voltage VREF Analog reference voltage Min. 3.0 Limits Typ. 3.3 Max. 3.6 0 AVSS Analog power source voltage VIA A-D converter input voltage AN0-AN7 VIH "H" input voltage VIH "H" input voltage VIH "H" input voltage (when TTL input level is selected) P70-P75 VIH Unit V V when A-D converter is used 2.0 VCC when D-A converter is used 2.7 VCC 0 V V AVSS VCC V P00-P07, P10-P17, P20-P27, P30-P37, P40-P47, P50-P57, P60-P67, P80-P87, RESET, CNVSS 0.8VCC VCC V P70-P77 0.8VCC 5.5 V 2.0 5.5 V "H" input voltage (when I2C-BUS input level is selected) SDA, SCL 0.7VCC 5.5 V VIH "H" input voltage (when SMBUS input level is selected) SDA, SCL 1.4 5.5 V VIH "H" input voltage XIN, XCIN 0.8VCC VCC V VIL "L" input voltage P00-P07, P10-P17, P20-P27, P30-P37, P40-P47, P50-P57, P60-P67, P70-P77, P80-P87, RESET, CNVSS 0 0.2VCC V VIL "L" input voltage (when TTL input level is selected) P70-P75 0 0.8 V VIL "L" input voltage (when I2C-BUS input level is selected) SDA, SCL 0 0.3VCC V VIL "L" input voltage (when SMBUS input level is selected) SDA, SCL 0 0.6 V VIL "L" input voltage 0 0.16VCC V 90 XIN, XCIN MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Table 28 Recommended operating conditions (VCC = 3.3 V 0.3V, Ta = -20 to 85 C, unless otherwise noted) Symbol IOH(peak) IOH(peak) IOL(peak) IOL(peak) IOL(peak) IOH(avg) IOH(avg) IOL(avg) IOL(avg) IOL(avg) Parameter "H" total peak output current "H" total peak output current "L" total peak output current "L" total peak output current "L" total peak output current "H" total average output current "H" total average output current "L" total average output current "L" total average output current "L" total average output current Min. Limits Typ. P00-P07, P10-P17, P20-P23, P30-P37, P80-P87 P40-P47, P50-P57, P60-P67 P00-P07, P10-P17, P20-P23, P30-P37, P80-P87 P24-P27 P40-P47,P50-P57, P60-P67, P70-P77 P00-P07, P10-P17, P20-P27, P30-P37, P80-P87 P40-P47,P50-P57, P60-P67 P00-P07, P10-P17, P20-P23, P30-P37, P80-P87 P24-P27 P40-P47,P50-P57, P60-P67, P70-P77 Max. -80 -80 80 80 80 -40 -40 40 40 40 Unit mA mA mA mA mA mA mA mA mA mA Note : The total output current is the sum of all the currents flowing through all the applicable ports. The total average current is an average value measured over 100 ms. The total peak current is the peak value of all the currents. Table 29 Recommended operating conditions (VCC = 3.3 V 0.3V, Ta = -20 to 85 C, unless otherwise noted) Symbol Parameter Min. Limits Typ. Max. -10 Unit IOH(peak) "H" peak output current P00-P07, P10-P17, P20-P27, P30-P37, P40-P47, P50-P57, P60-P67, P80-P87 (Note 1) IOL(peak) "L" peak output current P00-P07, P10-P17, P20-P23, P30-P37, P40-P47, P50-P57, P60-P67, P70-P77, P80-P87 (Note 1) 10 mA IOL(peak) "L" peak output current P24-P27 (Note 1) 20 mA IOH(avg) "H" average output current P00-P07, P10-P17, P20-P27, P30-P37, P40-P47, P50-P57, P60-P67, P80-P87 (Note 2) -5 mA IOL(avg) "L" average output current P00-P07, P10-P17, P20-P23, P30-P37, P40-P47, P50-P57, P60-P67, P70-P77, P80-P87 (Note 2) 5 mA IOL(avg) "L" peak output current P24-P27 (Note 2) 15 mA f(XIN) Main clock input oscillation frequency (Note 3) 8 MHz f(XCIN) Sub-clock input oscillation frequency (Notes 3, 4) 50 kHz 32.768 mA Notes 1: The peak output current is the peak current flowing in each port. 2: The average output current IOL(avg), IOH(avg) are average value measured over 100 ms. 3: When the oscillation frequency has a duty cycle of 50%. 4: When using the microcomputer in low-speed mode, set the sub-clock input oscillation frequency on condition that f(XCIN) < f(XIN)/3. 91 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Table 30 Electrical characteristics (VCC = 3.3 V 0.3V, VSS = 0 V, Ta = -20 to 85 C, unless otherwise noted) Limits Symbol VOH VOL VT+-VT- IIH IIH IIL IIL IIL VRAM Parameter "H" output voltage P00-P07, P10-P17, P20-P27 P30-P37, P40-P47, P50-P57 P60-P67, P80-P87 (Note) "L" output voltage P00-P07, P10-P17, P20-P27 P30-P37, P40-P47, P50-P57 P60-P67, P70-P77, P80-P87 Hysteresis CNTR0, CNTR1, INT0, INT1 INT20-INT40, INT21-INT41, INT5 P30-P37, RxD, SCLK, LRESET LFRAME, LCLK, SERIRQ "H" input current P00-P07, P10-P17, P20-P27 P30-P37, P40-P47, P50-P57 P60-P67, P70-P77, P80-P87 RESET, CNVSS "H" input current XIN "L" input current P00-P07, P10-P17, P20-P27 P30-P37, P40-P47, P50-P57 P60-P67, P70-P77, P80-P87 RESET,CNVSS "L" input current XIN "L" input current P30-P37 (at Pull-up) RAM hold voltage Test conditions IOH = -5 mA Min. Max. VCC-1.0 Unit V IOL = 5 mA 1.0 V IOL = 1.6 mA 0.4 V V 0.4 VI = VCC (Pin floating. Pull-up transistors "off") 5.0 VI = VCC VI = VSS (Pin floating. Pull-up transistors "off") -5.0 VI = VSS VI = VSS -13 When clock stopped 2.0 -3 -50 A A 3 Note: P00-P03 are measured when the P00-P03 output structure selection bit (bit 0 of PCTL1) is "0". P04-P07 are measured when the P04-P07 output structure selection bit (bit 1 of PCTL1) is "0". P10-P13 are measured when the P10-P13 output structure selection bit (bit 2 of PCTL1) is "0". P14-P17 are measured when the P14-P17 output structure selection bit (bit 3 of PCTL1) is "0". P42, P43, P44, and P46 are measured when the P4 output structure selection bit (bit 2 of PCTL2) is "0". P45 is measured when the P45/TXD P-channel output disable bit (bit 4 of UARTCON) is "0". 92 Typ. -100 3.6 A A A V MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Table 31 Electrical characteristics (VCC = 3.3 V 0.3V, VSS = 0 V, Ta = -20 to 85 C, Mask ROM version unless otherwise noted) Limits Symbol ICC Parameter Power source current Test conditions High-speed mode f(XIN) = 8 MHz f(XCIN) = 32.768 kHz Output transistors "off" High-speed mode f(XIN) = 8 MHz (in WIT state) f(XCIN) = 32.768 kHz Output transistors "off" Middle-speed mode f(XIN) = 8 MHz f(XCIN) = stopped Output transistors "off" Middle-speed mode f(XIN) = 8 MHz (in WIT state) f(XCIN) = stopped Output transistors "off" Low-speed mode f(XIN) = stopped f(XCIN) = 32.768 kHz Output transistors "off" Low-speed mode f(XIN) = stopped f(XCIN) = 32.768 kHz (in WIT state) Output transistors "off" Additional current when A-D converter works f(XIN) = 8 MHz Additional current when LPC I/F functions LCLK = 33 MHz Ta = 25 C All oscillation stopped (in STP state) Ta = 85 C Output transistors "off" Min. Unit Typ. Max. 2.5 7 mA 0.8 2 mA 1.5 4 mA 0.6 1.5 mA 15 40 A 10 20 A 500 A 1.5 mA 0.1 1.0 A 10 A 93 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Table 32 Electrical characteristics (VCC = 3.3 V 0.3V, VSS = 0 V, Ta = -20 to 85 C, Flash memory version, unless otherwise noted) Limits Symbol ICC 94 Parameter Power source current Test conditions High-speed mode f(XIN) = 8 MHz f(XCIN) = 32.768 kHz Output transistors "off" High-speed mode f(XIN) = 8 MHz (in WIT state) f(XCIN) = 32.768 kHz Output transistors "off" Middle-speed mode f(XIN) = 8 MHz f(XCIN) = stopped Output transistors "off" Middle-speed mode f(XIN) = 8 MHz (in WIT state) f(XCIN) = stopped Output transistors "off" Low-speed mode f(XIN) = stopped f(XCIN) = 32.768 kHz Output transistors "off" Low-speed mode f(XIN) = stopped f(XCIN) = 32.768 kHz (in WIT state) Output transistors "off" Additional current when A-D converter works f(XIN) = 8 MHz Additional current when LPC I/F functions LCLK = 33 MHz Ta = 25 C All oscillation stopped (in STP state) Ta = 85 C Output transistors "off" Min. Unit Typ. Max. 6.0 13 mA 0.8 2 mA 2.0 7 mA 0.6 1.5 mA 100 200 A 10 20 A 500 A 1.5 mA 0.1 1.0 A 10 A MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Table 33 A-D converter characteristics (1) (VCC = 3.3 V 0.3V, VREF = 2.0 V to VCC, VSS = AVSS = 0 V, Ta = -20 to 85 C, unless otherwise noted) 10-bit A-D mode (when conversion mode selection bit (bit 7 of AD2) is "0") Symbol Parameter - - Resolution Absolute accuracy (excluding quantization error) Conversion time Ladder resistor at A-D converter operated Reference power source input current at A-D converter stopped tCONV RLADDER IVREF II(AD) Test conditions Limits Min. Typ. VCC = VREF = 3.3 V VREF = 3.3 V VREF = 3.3 V 12 50 35 150 A-D port input current Max. 10 4 61 100 200 5 5.0 Unit bit LSB 2tc(XIN) k A A A Table 34 A-D converter characteristics (2) (VCC = 3.3 V 0.3V, VREF = 2.0 V to VCC, VSS = AVSS = 0 V, Ta = -20 to 85 C, unless otherwise noted) 8-bit A-D mode (when conversion mode selection bit (bit 7 of AD2) is "1") Symbol Parameter - - Resolution Absolute accuracy (excluding quantization error) Conversion time Ladder resistor at A-D converter operated Reference power source input current at A-D converter stopped tCONV RLADDER IVREF II(AD) Test conditions Limits Min. Typ. VCC = VREF = 3.3 V VREF = 3.3 V VREF = 3.3 V 12 50 35 150 A-D port input current Max. 8 2 50 100 200 5 5.0 Unit bit LSB 2tc(XIN) k A A A Table 35 D-A converter characteristics (VCC = 3.3 V 0.3V, VREF = 2.7 V to VCC, VSS = AVSS = 0 V, Ta = -20 to 85 C, unless otherwise noted) Symbol - - tsu RO IVREF Parameter Test conditions Resolution Absolute accuracy Setting time Output resistor Reference power source input current Limits Min. 2 Typ. 3.5 Max. 8 1.0 3 5 2.1 Unit Bits % s k mA Table 36 Comparator characteristics (VCC = 3.3 V 0.3V, VSS = 0 V, Ta = -20 to 85 C, unless otherwise noted) Symbol Parameter - TCONV Absolute accuracy Conversion time VIA IIA RLADDER CMPREF Analog input voltage Analog input current Ladder resistor Internal reference voltage External reference input voltage Test conditions Limits Min. Typ. 1LSB = VCC/16 at 8 MHz operating at 4 MHz operating 0 20 40 Max. 1/2 3.5 7 VCC 5.0 50 29VCC/32 VCC/32 VCC Unit LSB s s V A k V V 95 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Table 37 Timing requirements (VCC = 3.3 V 0.3V, VSS = 0 V, Ta = -20 to 85 C, unless otherwise noted) Symbol Limits Parameter Min. 16 125 50 50 20 5 5 200 80 80 Reset input "L" pulse width Main clock input cycle time Main clock input "H" pulse width Typ. Max. Unit tc(XIN) ns ns ns s s s ns ns ns tW(RESET) tC(XIN) tWH(XIN) tWL(XIN) tC(XCIN) tWH(XCIN) tWL(XCIN) tC(CNTR) tWH(CNTR) tWL(CNTR) Main clock input "L" pulse width Sub-clock input cycle time Sub-clock input "H" pulse width Sub-clock input "L" pulse width CNTR0, CNTR1 input cycle time CNTR0, CNTR1 input "H" pulse width CNTR0, CNTR1 input "L" pulse width tWH(INT) INT0, INT1, INT20, INT30, INT40, INT21, INT31, INT41 input "H" pulse width 80 ns tWL(INT) INT0, INT1, INT20, INT30, INT40, INT21, INT31, INT41 input "L" pulse width 80 ns tC(SCLK1) tWH(SCLK1) tWL(SCLK1) tsu(RxD-SCLK1) th(SCLK1-RxD) Serial I/O clock input cycle time (Note) Serial I/O clock input "H" pulse width (Note) Serial I/O clock input "L" pulse width (Note) Serial I/O input setup time Serial I/O input hold time 800 370 370 220 100 ns ns ns ns ns Note : When bit 6 of SIOCON is "1" (clock synchronous). Divide this value by four when bit 6 of SIOCON is "0" (UART). Table 38 Switching characteristics (VCC = 3.3 V 0.3V, VSS = 0 V, Ta = -20 to 85 C, unless otherwise noted) Symbol tWH (SCLK) tWL (SCLK) td (SCLK-TXD) tV (SCLK-TXD) tr (SCLK) tf (SCLK) tr (CMOS) tf (CMOS) Parameter Serial I/O clock output "H" pulse width Serial I/O clock output "L" pulse width Serial I/O output delay time (Note 1) Serial I/O output valid time (Note 1) Serial I/O clock output rising time Serial I/O clock output falling time CMOS output rising time (Note 2) CMOS output falling time (Note 2) Notes 1: When the P45/TXD P-channel output disable bit (bit 4 of UARTCON) is "0". 2: The XOUT pin is excluded. 96 Test conditions Limits Min. Typ. tC(SCLK)/2-30 tC(SCLK)/2-30 Max. 140 Fig. 90 -30 10 10 30 30 30 30 Unit ns ns ns ns ns ns ns ns MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Measurement output pin 50pF CMOS output Fig. 83 Circuit for measuring output switching characteristics 97 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Timing diagram tC(CNTR) tWH(CNTR) tWL(CNTR) 0.8VCC CNTR0, CNTR1 0.2VCC tWH(INT) INT0, INT1, INT5 INT20, INT30, INT40 INT21, INT31, INT41 tWL(INT) 0.8VCC 0.2VCC tW(RESET) RESET 0.8VCC 0.2VCC tC(XIN) tWH(XIN) tWL(XIN) 0.8VCC XIN 0.2VCC tC(XCIN) tWH(XCIN) tWL(XCIN) 0.8VCC XCIN 0.2VCC tC(SCLK) tf tr tWL(SCLK) SCLK 0.8VCC 0.2VCC tsu(RxD-SCLK) td(SCLK-TXD) Fig. 84 Timing diagram 98 th(SCLK-RxD) 0.8VCC 0.2VCC RXD TXD tWH(SCLK) tv(SCLK-TXD) MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Table 39 Multi-master I2C-BUS bus line characteristics Standard clock mode High-speed clock mode Symbol Parameter Min. Max. Max. Unit tBUF Bus free time 4.7 Min. 1.3 tHD;STA Hold time for START condition 4.0 0.6 tLOW Hold time for SCL clock = "0" 4.7 tR Rising time of both SCL and SDA signals tHD;DAT Data hold time tHIGH Hold time for SCL clock = "1" tF Falling time of both SCL and SDA signals tSU;DAT Data setup time 250 100 ns tSU;STA Setup time for repeated START condition 4.7 0.6 s tSU;STO Setup time for STOP condition 4.0 0.6 s s s s 1.3 20+0.1Cb 300 ns 0 0 0.9 s 4.0 0.6 1000 300 s 20+0.1Cb 300 ns Note: Cb = total capacitance of 1 bus line SDA tHD:STA tBUF tLOW SCL P tR tF S tHD:STA Sr tHD:DAT tsu:STO tHIGH tsu:DAT P tsu:STA S : START condition Sr: RESTART condition P : STOP condition Fig. 85 Timing diagram of multi-master I2C-BUS 99 MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER Table 40 Timing requirements and switching characteristics (VCC = 3.3 V 0.3V, VSS = 0 V, Ta = -20 to 85 C, unless otherwise noted) Symbol tC(CLK) tWH(CLK) tWL(CLK) tsu(D-C) th(C-D) Standard Parameter Min. 30 11 11 13 7 0 2 2 LCLK clock input cycle time LCLK clock input "H" pulse width LCLK clock input "L" pulse width input set up time LAD3 to LAD0, SERIRQ, CLKRUN, LFRAME input hold time LAD3 to LAD0, CLKRUN, LFRAME SERIRQ, tV(C-D) LAD3 to LAD0, SERIRQ, CLKRUN valid delay time toff(A-F) LAD3 to LAD0,SERIRQ,CLKRUN floating output delay time Typ. Max. ns ns ns ns ns 15 ns 28 ns Timing diagrams of LPC Bus Interface and Serial Interrupt Output tC(CLK) tWH(CLK) LCLK tWL(CLK) VIH VIL tsu(D-C) LAD[3:0] SERIRQ, CLKRUN, LFRAME (Input) tv(C-D) LAD[3:0] SERIRQ, CLKRUN (Active output) toff(A-F) LAD[3:0] SERIRQ, CLKRUN (Floating output ) Fig. 86 Timing diagram of LPC Interface and Serialized IRQ 100 Unit th(C-D) MITSUBISHI MICROCOMPUTERS 3885 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER PACKAGE OUTLINE MMP Plastic 80pin 1212mm body LQFP Weight(g) 0.47 JEDEC Code - Lead Material Cu Alloy MD HD b2 D 80 ME EIAJ Package Code LQFP80-P-1212-0.5 e 80P6Q-A 61 1 l2 Recommended Mount Pad 60 A A1 A2 b c D E e HD HE L L1 Lp HE E Symbol 41 20 21 40 A L1 F M y L Detail F Lp c x A1 b A3 A2 e A3 x y b2 I2 MD ME Dimension in Millimeters Min Nom Max - - 1.7 0.1 0.2 0 - - 1.4 0.13 0.18 0.28 0.105 0.125 0.175 11.9 12.0 12.1 11.9 12.0 12.1 0.5 - - 13.8 14.0 14.2 13.8 14.0 14.2 0.3 0.5 0.7 1.0 - - 0.45 0.6 0.75 - 0.25 - - - 0.08 0.1 - - 0 10 - 0.225 - - 0.9 - - 12.4 - - - - 12.4 Keep safety first in your circuit designs! * Mitsubishi Electric Corporation puts the maximum effort into making semiconductor products better and more reliable, but there is always the possibility that trouble may occur with them. Trouble with semiconductors may lead to personal injury, fire or property damage. Remember to give due consideration to safety when making your circuit designs, with appropriate measures such as (i) placement of substitutive, auxiliary circuits, (ii) use of non-flammable material or (iii) prevention against any malfunction or mishap. * These materials are intended as a reference to assist our customers in the selection of the Mitsubishi semiconductor product best suited to the customer's application; they do not convey any license under any intellectual property rights, or any other rights, belonging to Mitsubishi Electric Corporation or a third party. Mitsubishi Electric Corporation assumes no responsibility for any damage, or infringement of any third-party's rights, originating in the use of any product data, diagrams, charts, programs, algorithms, or circuit application examples contained in these materials. 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The prior written approval of Mitsubishi Electric Corporation is necessary to reprint or reproduce in whole or in part these materials. If these products or technologies are subject to the Japanese export control restrictions, they must be exported under a license from the Japanese government and cannot be imported into a country other than the approved destination. Any diversion or reexport contrary to the export control laws and regulations of Japan and/or the country of destination is prohibited. Please contact Mitsubishi Electric Corporation or an authorized Mitsubishi Semiconductor product distributor for further details on these materials or the products contained therein. Notes regarding these materials * * * * * * * (c) 2002 MITSUBISHI ELECTRIC CORP. New publication, effective June 2002. Specifications subject to change without notice. REVISION HISTORY Rev. 3885 GROUP DATA SHEET Date Description Summary Page 1.0 06/04/02 First edition issued. (1/X)