PIC16C641-04SLASHTQ datasheet(115/136 Pages) MICROCHIP

115 / 136 page

Preliminary

DS30559A-page 115

PIC16C64X & PIC16C66X

APPENDIX A: ENHANCEMENTS

The following are the list of enhancements over the

PIC16C5X microcontroller family:

Instruction word length is increased to 14 bits.

This allows larger page sizes both in program

memory (4K now as opposed to 512 before) and

before).

A PC high latch register (PCLATH) is added to

handle program memory paging. PA2, PA1, PA0

bits are removed from STATUS register.

Data memory paging is slightly redeﬁned.

STATUS register is modiﬁed.

Four new instructions have been added:

RETURN

, RETFIE, ADDLW, and SUBLW.

Two instructions TRIS and OPTION are being

phased

out

although

they

are

kept

for

compatibility with PIC16C5X.

OPTION

and

TRIS

registers

are

made

addressable.

Interrupt capability is added. Interrupt vector is

at 0004h.

Stack size is increased to 8 deep.

Reset vector is changed to 0000h.

Reset of all registers is revisited. Six different

reset (and wake-up) types are recognized.

Registers are reset differently.

10. Wake up from SLEEP through interrupt is

added.

11. Two separate timers, Oscillator Start-up Timer

(OST)

and

Power-up

Timer

(PWRT)

are

included for more reliable power-up. These

timers can be invoked selectively to avoid

unnecessary delays on power-up and wake-up.

12. PORTB has weak pull-ups and interrupt on

change feature.

13. Timer0 clock input, T0CKI pin is also a port pin

(RA4/T0CKI) and has a TRIS bit.

14. FSR is made a full 8-bit register.

15. “In-circuit programming” is made possible. The

user can program PIC16CXX devices using only

ﬁve pins: VDD, VSS, VPP, RB6 (clock) and RB7

(data in/out).

16. PCON status register is added with a Power-on

Reset status bit (POR), a Brown-out Reset sta-

tus bit (BOR), a Parity Error Reset (PER), and a

Memory Parity Enable (MPEEN) bit.

17. Code protection scheme is enhanced such that

portions of the program memory can be

protected, while the remainder is unprotected.

18. PORTA inputs are now Schmitt Trigger inputs.

19. Brown-out Reset circuitry has been added.

APPENDIX B: COMPATIBILITY

To convert code written for PIC16C5X to PIC16CXX,

the user should take the following steps:

Remove any program memory page select

operations (PA2, PA1, PA0 bits) for CALL, GOTO.

Revisit any computed jump operations (write to

PC or add to PC, etc.) to make sure page bits

are set properly under the new scheme.

Eliminate any data memory page switching.

Redeﬁne data variables to reallocate them.

Verify all writes to STATUS, OPTION, and FSR

registers since these have changed.

Change reset vector to 0000h.

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