18F8680 datasheet(132/496 Pages) MICROCHIP

132 / 496 page

PIC18F6585/8585/6680/8680

DS30491C-page 130

 2004 Microchip Technology Inc.

TABLE 10-3:

PORTB FUNCTIONS

TABLE 10-4:

SUMMARY OF REGISTERS ASSOCIATED WITH PORTB

Name

Bit#

Buffer

Function

RB0/INT0

bit 0

TTL/ST(1)

Input/output pin or external interrupt input 0. Internal software

programmable weak pull-up.

RB1/INT1

bit 1

TTL/ST(1)

Input/output pin or external interrupt input 1. Internal software

programmable weak pull-up.

RB2/INT2

bit 2

TTL/ST(1)

Input/output pin or external interrupt input 2. Internal software

programmable weak pull-up.

RB3/INT3/CCP2(3)

bit 3

TTL/ST(4)

Input/output pin or external interrupt input 3. Capture 2 input/

Compare 2 output/PWM output (when CCP2MX configuration bit is

enabled, all PIC18FXX85 operating modes except Microcontroller

mode). Internal software programmable weak pull-up.

RB4/KBI0

bit 4

TTL

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

programmable weak pull-up.

RB5/KBI1/PGM

bit 5

TTL/ST(2)

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

programmable weak pull-up. Low-voltage ICSP enable pin.

RB6/KBI2/PGC

bit 6

TTL/ST(2)

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

programmable weak pull-up. Serial programming clock.

RB7/KBI3/PGD

bit 7

TTL/ST(2)

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

RC1 is the alternate assignment for CCP2 when CCP2MX is not set (all operating modes except

Microcontroller mode).

This buffer is a Schmitt Trigger input when configured as the CCP2 input.

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

PORTB

RB7

RB6

RB5

RB4

RB3

RB2

RB1

RB0

xxxx xxxx

uuuu uuuu

LATB

LATB Data Output Register

xxxx xxxx

uuuu uuuu

TRISB

PORTB Data Direction Register

1111 1111

INTCON

GIE/

GIEH

PEIE/

GIEL

TMR0IE

INT0IE

RBIE

TMR0IF

INT0IF

RBIF

0000 0000

INTCON2

RBPU

INTEDG0 INTEDG1

INTEDG2

INTEDG3

TMR0IP

INT3IP

RBIP

1111 1111

INTCON3

INT2IP

INT1IP

INT3IE

INT2IE

INT1IE

INT3IF

INT2IF

INT1IF

1100 0000

Legend:

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

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