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.
2:
This buffer is a Schmitt Trigger input when used in Serial Programming mode.
3:
RC1 is the alternate assignment for CCP2 when CCP2MX is not set (all operating modes except
Microcontroller mode).
4:
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:
x
= unknown, u = unchanged. Shaded cells are not used by PORTB.