DOC-0410-010, REV B
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DEMO9S08EL32
Demonstration Board for Freescale MC9S08SE8
Microcontroller
USER GUIDE
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CONTENTS
CAUTIONARY NOTES ..............................................................................................................4
TERMINOLOGY.........................................................................................................................4
FEATURES................................................................................................................................5
REFERENCES...........................................................................................................................6
GETTING STARTED..................................................................................................................6
MEMORY MAP ..........................................................................................................................6
SOFTWARE DEVELOPMENT...................................................................................................6
DEVELOPMENT SUPPORT......................................................................................................7
INTEGRATED BDM .............................................................................................................. 7
BDM_PORT HEADER........................................................................................................... 7
POWER......................................................................................................................................7
POWER SELECT.................................................................................................................. 8
PWR_SEL.........................................................................................................................8
VX_EN............................................................................................................................... 9
RESET SWITCH ........................................................................................................................9
LOW VOLTAGE RESET............................................................................................................9
TIMING.....................................................................................................................................10
COMMUNICATIONS................................................................................................................10
RS-232 ................................................................................................................................ 10
COM CONNECTOR........................................................................................................ 10
LIN COMMUNICATIONS..................................................................................................... 11
LIN_EN............................................................................................................................ 11
COM_SEL....................................................................................................................... 11
USER I/O..................................................................................................................................12
SWITCHES ..................................................................................................................... 12
LED’S.............................................................................................................................. 12
POTENTIOMETER.......................................................................................................... 12
TEMPERATURE SENSOR ................................................................................................. 13
USER SIGNALS.................................................................................................................. 13
USER ENABLE ................................................................................................................... 13
MCU I/O PORT.........................................................................................................................14
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FIGURES
Figure 1: BDM_PORT Header....................................................................................................7
Figure 2: PWR_SEL Option Header...........................................................................................8
Figure 3: VX_EN Option Header ................................................................................................9
Figure 4: COM Connector.........................................................................................................10
Figure 5: LIN Connector ...........................................................................................................11
Figure 6: LIN_EN Option Header..............................................................................................11
Figure 7: COM_SEL Option......................................................................................................12
Figure 8: USER Option Header................................................................................................13
Figure 9: MCU I/O PORT – J1..................................................................................................14
TABLES
Table 1: Memory Map.................................................................................................................6
Table 2: COM Connections ......................................................................................................10
Table 3: User I/O......................................................................................................................13
REVISION
Date Rev Comments
January 15, 2007 A Initial Release
August 7, 2008 B Update format, minor corrections. Removed Op erating Modes section
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CAUTIONARY NOTES
1) Electrostatic Discharge (ESD) prevention measures should be used when handling this
product. ESD damage is not a warranty repair item.
2) Axiom Manufacturing does not assume any liability arising out of the application or use of
any product or circuit described herein; neither does it convey any license under patent
rights or the rights of others.
3) 3) EMC Information on the DEMO9S08EL32 board:
a) This product as shipped from the factory with associated power supplies and cables,
has been verified to meet with requirements of CE and the FCC as a CLASS A product.
b) This product is designed and intended for use as a development platform for hardware
or software in an educational or professional laboratory.
c) In a domestic environment, this product may cause radio interference in which case the
user may be required to take adequate prevention measures.
d) Attaching additional wiring to this product or modifying the products operation from the
factory default as shipped may effect its performance and cause interference with
nearby electronic equipment. If such interference is detected, suitable mitigating
measures should be taken.
TERMINOLOGY
This development module utilizes option select jumpers to configure default board operation.
Terminology for application of the option jumpers is as follows:
Jumper – a plastic shunt that connects 2 terminals electrically
Jumper on, in, or installed = jumper is a plastic shunt that fits across 2 pins and the shunt is
installed so that the 2 pins are connected with the shunt.
Jumper off, out, or idle = jumper or shunt is installed so that only 1 pin holds the shunt, no 2
pins are connected, or jumper is removed. It is recommended that the jumpers be placed
idle by installing on 1 pin so they will not be lost.
Cut-Trace – a circuit trace connection between component pads. The circuit trace may be
cut using a knife to break the default connection. To reconnect the circuit, simply install a
suitably sized 0-ohm resistor or attach a wire across the pads.
Signal names followed by an asterisk (*) denote active-low signals.
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FEATURES
The DEMO9S08EL32 is a demonstration board for the MC9S08EL32 microcontroller.
Application development is quick and easy with the integrated USB-BDM, sample software
tools, and examples. An optional BDM_PORT port is also provided to allow use of a
BDM_PORT cable. A 40-pin connector provide access to all IO signals on the target MCU.
• MC9S08EL32, 28 TSSOP
• 32K Bytes Flash
• 1K Bytes RAM
• 512K Bytes EEPROM
• Internal Oscillator
• Integrated USB-BDM
• BDM_PORT header for BDM cable support (not
installed)
• LIN PHY w/ 2, 4-pos Molex connectors
• MCU_PORT socket headers for access to MCU IO
signals
• On-board +5V regulator
• Optional Power from USB-BDM or MCU_PORT
connector
• Power Input Selection Jumpers
• Power input from USB-BDM
• Power input from on-board re gulator
• Power input from Connector J1
• Optional Power output through Con nector J1
• User Components Provided
• 3 Push Switches; 2 User, 1 Reset
• 7 LED Indicators; 2 User, VDD, USB Power, USB Power Out
• 5K ohm POTs w /LP Filter
• Light Sensor w/ LP Filter and Op Amp
• Jumpers
• PWR_SEL
• VX_EN
• USER_EN
• COM_SEL
• Connectors
• 40-pin MCU I/O Connector
• 2.0mm Barrel Connector
• BDM_PORT (not installed)
• USB Connector
• DB9 Connector
Specifications:
Board Size 2.9 x 3.2”
Power Input: +6VDC to +18VDC
NOTE: LIN functionality only supported wh en powered from PWR connector with input voltage
greater than +12V or when powered from the LIN bus.
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REFERENCES
Reference documents are provided on the support CD in Acrobat Reader format.
DEMO9S08EL32_UG.pdf DEMO9S08EL32 User Guide (this document)
DEMO9S08EL32_QSG.pdf DEMO9S08EL32 Quick Start Guide
DEMO9S08EL32 _SCH_A.pdf DEMO9S08EL32 Schematic Rev. A
DEMO9S08EL32_Silk_A.pdf DEMO9S08EL32 Top Silk, Rev A
EL32DEMO.zip Demo Program Source Code
GETTING STARTED
To get started quickly, please refer to the DEMO9S08EL32 Quick Start Guide. This quick start
will illustrate connecting the board to a PC, installing the correct version of CodeWarrior
Development Studio, and running a simple LED test program.
MEMORY MAP
Table 1 below shows the default memory map for the MC9S08EL32 immediately out of reset.
Access to unimplemented sections of memory forces a device reset. Refer to the
MC9S08EL32 Data Sheet (DS) for further information.
Table 1: Memory Map
$0000 -
$007F REGISTERS 128 bytes
$0080 -
$047F RAM 1024 bytes
$0480 -
$16FF Unimplemented 4736 bytes
$1700 -
$17FF EEPROM 2 x 256 bytes
$1800 -
$18FF High Page Registers 256 bytes
$1900 -
$7FFF Unimplemented 26368 bytes
$8000 -
$FFFF FLASH 32768 bytes
SOFTWARE DEVELOPMENT
Software development requires the use of a compiler or assembler supporting the HCS08
instruction set and a host PC operating a debug interface. CodeWarrior Development Studio
and Axiom IDE for Windows are supplied with this board.
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DEVELOPMENT SUPPORT
Application development and debug for the target MC9S08EL32 is supported through a
background debug mode (BDM) interface. The BDM interface consists of an integrated USB
BDM and a 6-pin interface header (BDM_PORT). The BDM_PORT header allows connecting
a HCS12/HCS08 BDM cable.
Integrated BDM
The DEMO9S08EL32 board features an integrated USB BDM. The integrated USB BDM
supports application development and debugging via background debug mode. All necessary
signals are provided by the integrated USB BDM. A USB, type B, connector provides
connection from the target board to the host PC.
The integrated USB BDM provides +5V power and ground to target board eliminating the need
to power the board externally. Power from the USB BDM is derived from the USB bus;
therefore, total current consumption for the target board, and connected circuitry, must not
exceed 500mA. This current limit describes the current supplied by the USB cable to the
BDM circuit, the target board, and any connected circuitry. Excessive current drain will violate
the USB specification causing the bus to disconnect. Damage to the host PC USB hub or the
target board may result.
BDM_PORT Header
A compatible HCS12 BDM cable can also attach to the 6-pin BDM interface header
(BDM_PORT). This header is not installed in default configuration. Figure 1 below shows the
pin-out for the BDM_PORT header. This information is included for completeness.
Figure 1: BDM_PORT Header
BKGD 1 2 GND
3 4 RESET*
5 6 VDD
See the MC9S08EL32 Data Sheet for complete
DEBUG documentation
NOTE: This header is not installed in d efault configuration.
POWER
The DEMO9S08EL32 is designed to allow the user to power the board through the USB BDM
during application development. A 2.0-mm barrel connector has been applied to support
stand-alone operation and to support LIN functionality. The board may also be powered
through connector J1. This connection may also be used to supply power from the board to
external circuitry. Optionally, the board may be powered from the LIN connectors.
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During application development, the board may be powered from either the USB-BDM or the
PWR connector. To utilize LIN functionality, however, the board must be powered from the
LIN bus or from PWR connector with an input voltage greater than +12VDC.
POWER SELECT
Power may be applied to the board through the integrated USB BDM circuitry, a 2.0mm barrel
connector, or through connector J1. Power selection is achieved using 2 selection headers:
PWR_SEL option header and the VX_EN option header.
PWR_SEL
The PWR_SEL option header selects power input either from the integrated USB BDM
circuitry or from the on-board voltage regulator. Figure 2 below details the PWR_SEL header
connections.
Figure 2: PWR_SEL Option Header
VB
VDD
123 Selects power input from USB-BDM
PWR_SEL
VB
VDD
123 Selects power input from on-board regulator or J1
PWR_SEL
NOTE: Set PWR_SEL jumper to VB during application development. Use barrel connector
input (PWR) to support LIN functionality if needed.
Power from the integrated BDM is drawn from the USB bus and is limited to 500 mA. This
current limit accounts for the total current supplied over the USB cable to the BDM circuit, the
target board, and any connected circuitry. Current drain in excess of 500 mA will violate the
USB specification and will cause the USB bus to disconnect. This will cause the board to
exhibit power cycling where the board appears to turn-on then off continually. Damage to the
host PC or the target board may also result.
The on-board voltage regulator (VR1) accepts power input through a 2.0mm barrel connector
(PWR). Input voltage may range from +6V to +18V. The voltage regulator (VR1) provides a
+5V fixed output limited to 250mA. Over-temperature and over-current limit built into the
voltage regulator provides protection from excessive stress. The user should consider the
maximum output current limit of VR1 when attempting to power off-board circuitry through
connector J1.
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If powered from the PWR connector, the integrated BDM may still be used to develop and
debug application code. Alternately, the board may be powered from the integrated BDM
while the LIN bus is powered from the PWR connector.
VX_EN
The VX_EN option header is a 2-pin jumper that connects or disconnects input J1-1 directly to
the target board, +5V voltage rail. J1-3 is directly connected to the ground plane. Use of this
feature requires a regulated +5V input power source. This power input is decoupled to
minimize noise but is not regulated. Care should be exercised when using this feature; no
protection is applied on this input and damage to the target board may result if over-driven.
Also, do not attempt to power the target board through this connector while also applying
power through the USB BDM or the PWR connector; damage to the board may result.
Power may also be sourced to off-board circuitry through the J1 connector. The current
supplied from the USB bus or the on-board regulator limits current available to external
circuitry. Excessive current drain may damage the target board, the host PC USB hub, or the
on-board regulator. Figure 3 below details the VX_EN header connections.
Figure 3: VX_EN Option Header
ON OFF
1 2 Enabled Disabled
VX_EN
CAUTION: Do not exceed available current supply from USB BDM or on-board regulator, when
sourcing power through connector J1 to external circuitry.
RESET SWITCH
The RESET switch applies an asynchronous RESET to the MCU. The RESET switch is
connected directly to the RESET* input on the MCU. Pressing the RESET switch applies a
low voltage level to the RESET* input. A pull-up bias resistor allows normal MCU operation.
Shunt capacitance ensures an adequate input pulse width.
LOW VOLTAGE RESET
The MC9S08EL32 utilizes an internal Low Voltage Detect (LVD) circuit. The LVD holds the
MCU in reset until applied voltage reaches an appropriate level. The LVD also protect against
under-voltage conditions. Consult the MC9S08EL32 reference manual for details LVD
operation.
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TIMING
The DEMO9S08EL32 is configured to use the target MCU’s internal clock source by default.
Space is provided for an external, 32 kHz XTAL oscillator; however, the external timing source
is not populated. The internal timing source is active out of RESET. Default configuration sets
the internal bus to run at 8.4MHz. The internal clock source is trimmable to ± 0.2%. Refer to
the MC9S08EL32 Data Sheet for further details.
COMMUNICATIONS
The DEMO9S08EL32 board applies a single Serial Communications Interface (SCI) port
configurable between either SCI or LIN functionality. RS-232 communications are supported
through a DB9 connector. LIN communications are supported through a pair of 4-pin Molex
connectors. A 2x3 option header selects the desired communications protocol.
RS-232
An RS-232 translator provides RS-232 to TTL/CMOS logic level translation on the COM
connector. The COM connector is a 9-pin Dsub, right-angle connector. A ferrite bead on
shield ground provides conducted immunity protection. Communication signals TXD and RXD
are routed from the transceiver to the MCU. Hardware flow control signals RTS and CTS are
available on the logic side of the transceiver. These signals are routed to vias located near the
transceiver. RTS has been biased properly to support 2-wire RS-232 communications.
Table 2 below details the SCI connections to the target MCU.
Table 2: COM Connections
MCU Port COM Signal I/O PORT
CONNECTOR
PTB1/PIB1/SLTXD/TXD/ADP5 TXD J1-5
PTB0/PIB0/SLRXD/RXD/ADP4 RXD J1-7
COM Connector
A standard 9-pin Dsub connector provides external connections for the SCI0 port. The Dsub
shell is connected to board ground through a ferrite bead. The ferrite bead provides noise
isolation on the RS-232 connection. Figure 4 below details the DB9 connector pin-out.
Figure 4: COM Connector
4, 6 161, 4
TXD 27RTS
RXD 38CTS
1, 6 49NC
GND 5
Female DB9 connector that interfaces to the MCU internal SCI0 serial
port via the RS232 transceiver. Flow control is provided at test points on
the board.
Pins 1, 4, and 6 are connected together.
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LIN Communications
The DEMO9S08EL32 applies a fault tolerant, Local Interconnect Interface (LIN) physical layer
(PHY) for use in developing automotive control applications. The PHY supports LIN bus
functionality for input voltages between +12V and +18V. Only power applied to the PWR
connector or through the LIN bus enable LIN functionality. Two, 4-pin, Molex connectors
provide off-board connectivity. Figure 5 below shows the pin-out of the LIN connector looking
into the connector.
Figure 5: LIN Connector
LIN I/O 4 3 VSUP
GND 2 1 GND REF: Mating Connector, Molex P/N,
39-01-2040, Housing
39-00-0039, Socket
NOTE: +12V must be applied to the PWR connector when using the LIN functionality.
LIN_EN
The LIN_EN option header can be used to disable the LIN PHY under MCU control. The LIN
PHY is enabled by default if this header is removed. Figure 6 shows the LIN_EN shunt
positions.
Figure 6: LIN_EN Option Header
ON OFF
1 2 Enabled Disabled
VX_EN
COM_SEL
The COM_SEL option header connects the MCU SCI port to either the SCI PHY or the LIN
PHY. Figure 7 below shows jumper setting selecting between SCI or LIN signalling.
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Figure 7: COM_SEL Option
COM LIN
246
135Select LIN communications
COM_SEL
COM LIN
531
642Select COM communications
COM_SEL
USER I/O
User I/O includes 1 potentiometers, 1 Light Sensor, 2 push button switches, and 2 green LEDs
for user I/O. The User option header block enables or disables each User I/O function
individually. Table 3 and Figure 8 below show the USER enable position and associated
signals for each USER option.
Switches
The DEMO9S08EL32 provides 2 push button switches for user input. Each push button switch
provides an active low input with a pull-up resistor bias to prevent indeterminate input
conditions. Pressing a push-button switch causes a low logic input on the associated input.
Refer to Table 3 below.
LED’s
The DEMO9S08EL32 target board provides 2 green LEDs for output indication. Each LED is
an active low output. Writing a low logic level to an LED output causes the associated LED to
turn on. A series, current-limit resistor prevents excessive diode current. Refer to Table 3
below.
Potentiometer
The DEMO9S08EL32 target board provides a 5K ohm potentiometer (POT) to simulate analog
input. The POT is decoupled to minimize noise during adjustment. Potentiometer RV1
connects to analog input PTA0. Refer to Table 3 below.
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Temperature Sensor
A surface-mount, NTC Thermistor is installed at location RZ1. This component provides a
voltage input to the MCU inversely proportional to temperature. The component used provides
a B = 3900. Refer to Table 3 below.
User Signals
Table 3 shows the connections for each user I/O device.
Table 3: User I/O
USER Ref Des Signal Device
1SW1 PTA2/PIA/ADP2 Push Button Switch
2SW2 PTA3/PIA3/ADP3 Push Button Switch
3LED1 PTC0/PIC0/TPM1CH0 Green LED
4LED2 PTC1/PIC1/TPM1CH1 Green LED
5RV1 PTA0/PIA0/ACMP1+ Potentiometer
6RZ1 PTA1/PIA1/ACMP1- Sensor
User Enable
The User option header block enables or disables each User I/O device individually. User I/O
includes 4 green LEDs, 2 push button switches, one 4-position DIP switch, a Light Sensor, and
a potentiometer. Installing a shunt enables the associated option. Removing a shunt disables
the associated option. Figure 8 below shows the configuration option for each USER I/O.
Figure 8: USER Option Header
Shunt
USER Installed Removed Description
11 2 Enable Disable Push Button Switch 1
23 4 Enable Disable Push Button Switch 2
35 6 Enable Disable LED 1
47 8 Enable Disable LED 2
5910 Enable Disable Potentiometer
611 12 Enable Disable Sensor
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MCU I/O PORT
The MCU I/O PORT connectors (J1 and J2) provide access to the MC9S08EL32 I/O signals.
Figure 9 below show the pin-out for each MCU I/O connector.
Figure 9: MCU I/O PORT – J1
VDD 12
RESET*
VSS 34
RESET*
PTB1/PIB1/SLTXD/TXD/ADP5 56
BKGD/MS
PTB0/PIB0/SLRXD/RXD/ADP4 78
PTB7/SCL/EXTAL
PTA2/PIA2/SDA/RXD/ACMP1O/ADP2 910
PTA3/PIA3/SCL/TXD/ADP3 11 12
PTA0/PIA0/TMP1CH0/TCLK/ACMP1+ 13 14
PTB6/SDA/XTAL 15 16
PTB3/PIB3/SCL/MOSI/ADP7 17 18 PTA1/PIA1/TMP2CH0/ACMP1-/ADP1
PTB4/TMP2CH1/MISO 19 20 PTA0/PIA0/TMP1CH0/TCLK/ACMP1+
PTB2/PIB2/SDA/SPSCK/ADP6 21 22
PTB5/TPM1CH1/SS* 23 24
PTC0/PIC0/TPM1CH0/ADP8 25 26 PTB1/PIB1/SLTXD/TXD/ADP5
PTC1/PIC1/TPM1CH1/ADP9 27 28 PTB0/PIB0/SLRXD/RXD/ADP4
PTC2/PIC2/TPM1CH2/ADP10 29 30 PTA6/TPM2CH0
PTC3/PIC3/TMP1CH3/ADP11 31 32 PTA7/TPM2CH1
PTC4/PIC4/ADP12 33 34 PTC6/PIC6/ACMP2+/ADP14
PTC5/PIC5/ACMP2O/ADP13 35 36 PTC7/PIC7/ACMP2-/ADP15
NC 37 38 NC
NC 39 40 NC
