PIC16LC71 datasheet(161/176 Pages) MICROCHIP

161 / 176 page

DS30272A-page 161

PIC16C71X

APPENDIX A:

The following are the list of modiﬁcations over the

PIC16C5X microcontroller family:

Instruction word length is increased to 14-bits.

This allows larger page sizes both in program

memory (1K now as opposed to 512 before) and

before).

A PC high latch register (PCLATH) is added to

handle program memory paging. Bits PA2, PA1,

PA0 are removed from STATUS register.

Data memory paging is redeﬁned slightly.

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 compati-

bility with PIC16C5X.

OPTION and TRIS registers are made address-

able.

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. Five different

reset (and wake-up) types are recognized. Reg-

isters 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 tim-

ers are invoked selectively to avoid unneces-

sary delays on power-up and wake-up.

12. PORTB has weak pull-ups and interrupt on

change feature.

13. T0CKI pin is also a port pin (RA4) now.

14. FSR is made a full eight bit register.

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

The user can program PIC16CXX devices using

only ﬁve pins: VDD, VSS, MCLR/VPP, RB6 (clock)

and RB7 (data in/out).

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

Reset status bit (POR).

17. Code protection scheme is enhanced such that

portions of the program memory can be pro-

tected, while the remainder is unprotected.

18. Brown-out protection circuitry has been added.

Controlled by conﬁguration word bit BODEN.

Brown-out reset ensures the device is placed in

a reset condition if VDD dips below a ﬁxed set-

point.

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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