PIC16LC712 datasheet(95/106 Pages) MICROCHIP

95 / 106 page

 1999-2013 Microchip Technology Inc.

DS41106C-page 95

PIC16C712/716

APPENDIX A: REVISION HISTORY

APPENDIX B: CONVERSION

CONSIDERATIONS

There are no previous versions of this device.

APPENDIX C: MIGRATION FROM

BASE-LINE TO

MID-RANGE DEVICES

This section discusses how to migrate from a baseline

device (i.e., PIC16C5X) to a mid-range device (i.e.,

PIC16CXXX).

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 (2K 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_REG 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. Five 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 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

protected, 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

setpoint.

To convert code written for PIC16C5X to PIC16CXXX,

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.

Version

Date

Revision Description

2/99

This is a new data sheet. How-

ever, the devices described in this

data sheet are the upgrades to

the devices found in the

PIC16C6X Data Sheet,

DS30234, and the PIC16C7X

Data Sheet, DS30390.

9/05

Removed Preliminary Status.

1/13

Added a note to each package

outline drawing.

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