PIC16F877ATISLASHP datasheet(47/234 Pages) MICROCHIP

47 / 234 page

 2003 Microchip Technology Inc.

DS39582B-page 45

PIC16F87XA

TABLE 4-3:

PORTB FUNCTIONS

TABLE 4-4:

SUMMARY OF REGISTERS ASSOCIATED WITH PORTB

Name

Bit#

Buffer

Function

RB0/INT

bit 0

TTL/ST(1)

Input/output pin or external interrupt input. Internal software programmable

weak pull-up.

RB1

bit 1

TTL

Input/output pin. Internal software programmable weak pull-up.

RB2

bit 2

TTL

Input/output pin. Internal software programmable weak pull-up.

RB3/PGM(3)

bit 3

TTL

Input/output pin or programming pin in LVP mode. Internal software

programmable weak pull-up.

RB4

bit 4

TTL

Input/output pin (with interrupt-on-change). Internal software programmable

weak pull-up.

RB5

bit 5

TTL

Input/output pin (with interrupt-on-change). Internal software programmable

weak pull-up.

RB6/PGC

bit 6

TTL/ST(2)

Input/output pin (with interrupt-on-change) or in-circuit debugger pin.

Internal software programmable weak pull-up. Serial programming clock.

RB7/PGD

bit 7

TTL/ST(2)

Input/output pin (with interrupt-on-change) or in-circuit debugger pin.

Internal software programmable weak pull-up. Serial programming data.

Legend:

TTL = TTL input, ST = Schmitt Trigger input

Note 1:

This buffer is a Schmitt Trigger input when configured as the external interrupt.

This buffer is a Schmitt Trigger input when used in Serial Programming mode or in-circuit debugger.

Low-Voltage ICSP Programming (LVP) is enabled by default which disables the RB3 I/O function. LVP

must be disabled to enable RB3 as an I/O pin and allow maximum compatibility to the other 28-pin and

40-pin mid-range devices.

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on:

POR, BOR

Value on

all other

Resets

06h, 106h PORTB

RB7

RB6

RB5

RB4

RB3

RB2

RB1

RB0 xxxx xxxx uuuu uuuu

86h, 186h TRISB

PORTB Data Direction Register

1111 1111 1111 1111

81h, 181h OPTION_REG RBPU

INTEDG

T0CS

T0SE

PSA

PS2

PS1

PS0 1111 1111 1111 1111

Legend: x = unknown, u = unchanged. Shaded cells are not used by PORTB.

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