Datasheet
PIC18F6520/8520/6620/8620/6720/8720
DS39609C-page 108 2003-2013 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. Capture2 input/Compare2
output/PWM output (when CCP2MX configuration bit is enabled, all
PIC18F8X20 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 1111 1111
INTCON
GIE/
GIEH
PEIE/
GIEL
TMR0IE INT0IE RBIE TMR0IF INT0IF RBIF 0000 0000 0000 0000
INTCON2 RBPU INTEDG0 INTEDG1 INTEDG2
INTEDG3 TMR0IP INT3IP RBIP 1111 1111 1111 1111
INTCON3 INT2IP INT1IP
INT3IE INT2IE INT1IE INT3IF INT2IF INT1IF 1100 0000 1100 0000
Legend: x = unknown, u = unchanged. Shaded cells are not used by PORTB.