PIC17C752 MICROCHIP [Microchip Technology], PIC17C752 Datasheet - Page 265

• Manufacturer Part Number: PIC17C752
• Description: High-Performance 8-Bit CMOS EPROM Microcontrollers
• Manufacturer: MICROCHIP [Microchip Technology]

APPENDIX A: MODIFICATIONS
The following is the list of modifications over the
PIC16CXX microcontroller family:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. Multiple Interrupt vectors added. This can
11. Stack size is increased to 16 deep.
12. BSR register for data memory paging.
13. Wake up from SLEEP operates slightly differ-
14. The Oscillator Start-Up Timer (OST) and
15. PORTB interrupt on change feature works on all
16. TMR0 is 16-bit plus 8-bit prescaler.
17. Second indirect addressing register added
18. Hardware multiplier added (8 x 8
19. Peripheral modules operate slightly differently.
20. A/D has both a V
21. USARTs do not implement BRGH feature.
22. Oscillator modes slightly redefined.
23. Control/Status bits and registers have been
24. In-circuit serial programming is implemented dif-
1997 Microchip Technology Inc.
Instruction word length is increased to 16-bit.
This allows larger page sizes both in program
memory (8 Kwords verses 2 Kwords) and regis-
ter file (256 bytes versus 128 bytes).
Four modes of operation: microcontroller, pro-
tected microcontroller, extended microcontroller,
and microprocessor.
22 new instructions.
The MOVF, TRIS and OPTION instructions have
been removed.
Four new instructions (TLRD, TLWT, TABLRD,
TABLWT) for transferring data between data
memory and program memory. They can be
used to “self program” the EPROM program
memory.
Single cycle data memory to data memory trans-
fers possible (MOVPF and MOVFP instructions).
These instructions do not affect the Working
register (WREG).
W register (WREG) is now directly addressable.
A PC high latch register (PCLATH) is extended
to 8-bits. The PCLATCH register is now both
readable and writable.
Data memory paging is redefined slightly.
DDR registers replaces function of TRIS regis-
ters.
decrease the latency for servicing interrupts.
ently.
Power-Up Timer (PWRT) operate in parallel and
not in series.
eight port pins.
(FSR1 and FSR2). Configuration bits can select
the FSR registers to auto-increment, auto-dec-
rement, remain unchanged after an indirect
address.
placed in different registers and the control bit
for globally enabling interrupts has inverse
polarity.
ferently.
REF
+ and V
REF
-.
16-bit)
Preliminary
APPENDIX B: COMPATIBILITY
To
PIC17CXXX, the user should take the following steps:
1.
2.
3.
4.
5.
6.
7.
8.
9.
To convert code from the PIC17C42 to all the other
PIC17CXXX devices, the user should take the following
steps.
1.
2.
3.
Note:
Remove any TRIS and OPTION instructions, and
implement the equivalent code.
Separate the interrupt service routine into its
four vectors.
Replace:
MOVF
with:
MOVFP
Replace:
MOVF
MOVWF
with:
MOVPF
or
MOVFP
Ensure that all bit names and register names
are updated to new data memory map locations.
Verify data memory banking.
Verify mode of operation for indirect addressing.
Verify peripheral routines for compatibility.
Weak pull-ups are enabled on reset.
If the hardware multiply is to be used, ensure
that any variables at address 18h and 19h are
moved to another address.
Ensure that the upper nibble of the BSR was not
written with a non-zero value. This may cause
unexpected operation since the RAM bank is no
longer 0.
The disabling of global interrupts has been
enhanced so there is no additional testing of the
GLINTD bit after a BSF
instruction.
convert
If REG1 and REG2 are both at addresses
greater then 20h, two instructions are
required.
MOVFP
MOVPF
REG1, REG2 ; Addr(REG2)<20h
code
REG1, W
REG1, WREG
REG1, W
REG2
REG1, REG2 ; Addr(REG1)<20h
REG1, WREG ;
WREG, REG2 ;
written
for
CPUSTA,
DS30264A-page 265
PIC16CXXX
GLINTD
to