PIC876 datasheet(34/218 Pages) MICROCHIP

34 / 218 page

PIC16F87X

DS30292C-page 32

 2001 Microchip Technology Inc.

TABLE 3-3:

PORTB FUNCTIONS

TABLE 3-4:

SUMMARY OF REGISTERS ASSOCIATED WITH PORTB

Name

Bit#

Buffer

Function

RB0/INT

bit0

TTL/ST(1)

Input/output pin or external interrupt input. Internal software

programmable weak pull-up.

RB1

bit1

TTL

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

RB2

bit2

TTL

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

RB3/PGM(3)

bit3

TTL

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

programmable weak pull-up.

RB4

bit4

TTL

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

weak pull-up.

RB5

bit5

TTL

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

weak pull-up.

RB6/PGC

bit6

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

bit7

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.

2: This buffer is a Schmitt Trigger input when used in Serial Programming mode.

3: 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

81h, 181h

OPTION_REG

RBPU

INTEDG

T0CS

T0SE

PSA

PS2

PS1

PS0

1111 1111

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

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