PIC18F8621T-I/PT【PDF 14/396 页】IC PIC MCU FLASH 32KX16 80TQFP

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PIC18F6525/6621/8525/8621

DS39612B-page 108

2005 Microchip Technology Inc.

TABLE 10-3:

PORTB FUNCTIONS

TABLE 10-4:

SUMMARY OF REGISTERS ASSOCIATED WITH PORTB

Name

Bit#

Buffer

Function

RB0/INT0/FLT0

bit 0

TTL/ST(1)

Input/output pin or external interrupt input 0, ECCP1 PWM Fault input.

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/

ECCP2(3)/P2A(3)

bit 3

TTL/ST(4)

Input/output pin, external interrupt input 3, Enhanced Capture 2 input/

Compare 2 output/PWM 2 output or Enhanced PWM output P2A.

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.

Valid for PIC18F8525/8621 devices in all operating modes except Microcontroller mode when CCP2MX is

not set. RC1 is the default assignment for ECCP2/PA2 when CCP2MX is set in all devices; RE7 is the

alternate assignment for PIC18F8525/8621 devices in Microcontroller mode when CCP2MX is clear.

This buffer is a Schmitt Trigger input when configured as the ECCP2 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 000x

0000 000u

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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