PIC16F716 datasheet(116/126 Pages) MICROCHIP

116 / 126 page

PIC16F716

DS41206A-page 114

Preliminary

 2003 Microchip Technology Inc.

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.,

PIC16F716).

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

compatibility 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

avoid

unnecessary 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 PIC16F716 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. Brown-out protection circuitry has been added.

Controlled by configuration word bits BOREN

and BORV. 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 PIC16F716,

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

Note 1: This

device has

been designed to

perform to the parameters of its data

sheet. It has been tested to an electrical

specification designed to determine its

conformance with these parameters. Due

to process differences in the manufacture

of this device, this device may have differ-

ent performance characteristics than its

earlier version. These differences may

cause this device to perform differently in

your application than the earlier version of

this device.

2: The user should verify that the device

oscillator

starts

and

performs

expected. Adjusting the loading capacitor

values and/or the Oscillator mode may be

required.

PIC16F716 Datasheet(PDF) 116 Page - Microchip Technology

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