October, 1997 Microchip Technology Inc. DS30412C/44/E1A2-page 1
The PIC17C44 (Rev. A) par ts you have received con-
form functionally to the PIC17C4X preliminary data
sheet (DS30412
C
), except for the following clarifica-
tions and corrections.
NONE
Clarifications/Corrections to the Data Sheet:
The PIC17C44 Preliminary Data Sheet (document
DS30412
C
) that you ha ve received, requires the follow-
ing clarifications and corrections.
1. The clearing of any interrupt enable bit(s) in the
INTSTA register should be preceded by the dis-
abling of the global interrupt control bit (setting
GLINTD). Global interrupts may then be re-
enabled. The individual interrupts may be re-
enabled without further control of the GLINTD
bit.
When global interrupts are enabled, if the interrupt
flag is being set when the corresponding enable bit
is being cleared the de vice will br anch to the reset
vector address (0h). The interrupt flag will not be
(automatically) cleared.
2. The
RETURN
instruction causes an update of the
PCLATH register. The PCLATH register is
loaded with the high address of the
RETURN
instruction.
3. The Table write to internal program memory (self
programming) can occur even when the MCLR
pin is either at the V
IH
or V
IHH
voltage level.
When the MCLR pin is at V
IH
, the table write
sequence occurs, but the programming voltage
is marginal since the MCLR pin is not at the cor-
rect level. This table write may cause the speci-
fied program memory location to be corrupted
(depending on the data in the TABLAT register).
PIC17C44
PIC17C44 Rev. A Silicon Errata Sheet
Note:
As with any windowed EPROM device, please cover the window at all times, except when erasing.
PIC17C44
DS30412C/44/E1A2-page 2
October, 1997 Microchip Technology Inc.
4. Unexpected results may occur if a table write
(
TABLWT
instruction) to external memor y occurs
after a table read (
TABLRD
instruction).
To ensure that the proper 16-bit value is written, a
table write (
TLWT
) intruction(s) needs to be fol-
lowed by the
TABLWT
instruction. If not the value
that is written will not be as expected. The value
will contain the values that were last written to the
TABLATH and TABLATL registers and will not con-
tain the values that had been read from the exter-
nal memor y into the TABLATH:TABLATL registers
by the
TABLRD
instruction.
Example:
TABLAT Ext Bus
TLWT LO, fn1 x:fn1 -:-
TABLWT HI, 1, fn2 fn2:fn1 fn2:fn1
:
TABLRD HI, 0, fn3 X1:X0 X1:X0
TLRD LO, fn4 X1:X0 -:-
:
TABLWT HI, 1, fn5 fn5:X0 fn5:fn1
5. The Power-down current of the PIC17
C
44 has
been increased as shown in Table 1. The speci-
fication of 5
µ
A remains for the PIC17
LC
44
devices.
TABLE 1: DC SPECIFICATION LIMITS THAT VARY FROM DATA SHEET
Param
No. Sym. Characteristic Tested Data Sheet Units Condition
Min Typ Max Min Typ Max
D021 I
PD
Power-down Current — < 1 10 — < 1 5
µ
A PIC17
C
44
—< 15—< 15
µ
A PIC17
LC
44
2002 Microchip Technology Inc.
Information contained in this publication regarding device
applications and the like is intended through sug gestion only
and may be superseded by updates. I t is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microc hip Technology Inc orporated with respect
to the accuracy or use of such inf orm ation, or inf ringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchip’s products as critical com-
ponents in life support systems is not authorized except with
express written approval by Microchip. No licenses are con-
veyed, implicitly or otherwise, under any intellectual property
rights.
Trademarks
The Microchip name and logo, the Microchip logo, FilterLab,
KEELOQ, microID, MPLAB, PIC, PICmicro, PICMASTER,
PICSTART, PRO MATE, SEEVAL and The Embedded Control
Solutions Company are registered trademarks of Microchip Tech-
nology Incorporated in the U.S.A. and ot her countries.
dsPIC, ECONOMONITOR, FanSense, FlexRO M, fuzzyLAB,
In-Circuit Serial Programming, ICSP, ICEPIC, microPort,
Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM,
MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode
and Total Endurance are trademarks of Microchip Technology
Incorporated in the U.S.A.
Serialized Quick Turn Programming (SQTP) is a service mark
of Microchip Technology Incorpora ted in the U.S.A.
All other trademarks mentioned herein are property of their
respective comp anies.
© 2002, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received QS-9000 quality system
certification for its worldwide headquarters,
design and wafer fabrication facilities in
Chandler and T empe, Arizona in July 1999. The
Company’s quality system processes and
procedures are QS-9000 compliant for its
PICmicro® 8-bit MCUs, KEELOQ® code ho pp in g
devices, Serial EEPROMs and microperipheral
products. In addition, Microchip’s quality
system for the design and manufacture of
development systems is ISO 9001 certified.
Note the following details of the code protection feature on PICmicro® MCUs.
•The PICmicro family meets the specifications contained in t he Microchip Data Sheet.
•Microchip believes that its family of PICmicro microcontrollers is one of the most secure products of its kind on the market today,
when used in the intended manner and under normal conditions.
•There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowl-
edge, require using the PICmicro microcontroller in a manner outside the operating specifications contained in the data sheet.
The person doing so may be engaged in theft of intellectual property.
•Microchip is willing to work with the customer who is concerned about the integrity of their code.
•Neither Microchip nor any other semiconduct or manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable”.
•Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of
our product.
If you have any furt her questions about this matt er, please contact the local sales office nearest to you.
2002 Microchip Technology Inc.
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