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1996 Microchip Technology Inc.
DS30412C-page 211
PIC17C4X
APPENDIX A: MODIFICATIONS
The following is the list of modications over the
PIC16CXX microcontroller family:
1.
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 le (256 bytes versus 128 bytes).
2.
Four modes of operation: microcontroller, pro-
tected microcontroller, extended microcontroller,
and microprocessor.
3.
22 new instructions.
The MOVF, TRIS and OPTION instructions have
been removed.
4.
4 new instructions for transferring data between
data memory and program memory. This can be
used to “self program” the EPROM program
memory.
5.
Single cycle data memory to data memory trans-
fers possible (MOVPF and MOVFP instructions).
These instructions do not affect the Working reg-
ister (WREG).
6.
W register (WREG) is now directly addressable.
7.
A PC high latch register (PCLATH) is extended
to 8-bits. The PCLATCH register is now both
readable and writable.
8.
Data memory paging is redened slightly.
9.
DDR registers replaces function of TRIS regis-
ters.
10. Multiple Interrupt vectors added. This can
decrease the latency for servicing the interrupt.
11. Stack size is increased to 16 deep.
12. BSR register for data memory paging.
13. Wake up from SLEEP operates slightly differ-
ently.
14. The Oscillator Start-Up Timer (OST) and
Power-Up Timer (PWRT) operate in parallel and
not in series.
15. PORTB interrupt on change feature works on all
eight port pins.
16. TMR0 is 16-bit plus 8-bit prescaler.
17. Second indirect addressing register added
(FSR1 and FSR2). Conguration bits can select
the FSR registers to auto-increment, auto-dec-
rement, remain unchanged after an indirect
address.
18. Hardware multiplier added (8 x 8
→ 16-bit)
(PIC17C43 and PIC17C44 only).
19. Peripheral modules operate slightly differently.
20. Oscillator modes slightly redened.
21. Control/Status bits and registers have been
placed in different registers and the control bit
for globally enabling interrupts has inverse
polarity.
22. Addition of a test mode pin.
23. In-circuit serial programming is not imple-
mented.
APPENDIX B: COMPATIBILITY
To convert code written for PIC16CXX to PIC17CXX,
the user should take the following steps:
1.
Remove any TRIS and OPTION instructions,
and implement the equivalent code.
2.
Separate the interrupt service routine into its
four vectors.
3.
Replace:
MOVF
REG1, W
with:
MOVFP
REG1, WREG
4.
Replace:
MOVF
REG1, W
MOVWF
REG2
with:
MOVPF
REG1, REG2 ; Addr(REG1)<20h
or
MOVFP
REG1, REG2 ; Addr(REG2)<20h
5.
Ensure that all bit names and register names are
updated to new data memory map location.
6.
Verify data memory banking.
7.
Verify mode of operation for indirect addressing.
8.
Verify peripheral routines for compatibility.
9.
Weak pull-ups are enabled on reset.
To convert code from the PIC17C42 to all the other
PIC17C4X devices, the user should take the following
steps.
1.
If the hardware multiply is to be used, ensure
that any variables at address 18h and 19h are
moved to another address.
2.
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.
3.
The disabling of global interrupts has been
enhanced so there is no additional testing of the
GLINTD bit after a BSF
CPUSTA,
GLINTD
instruction.
Note:
If REG1 and REG2 are both at addresses
greater then 20h, two instructions are
required.
MOVFP
REG1, WREG ;
MOVPF
WREG, REG2 ;
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