PIC18FXX8 Datasheet, PDF (101/402 Pages) Microchip Technology – 28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module

PIC18FXX8
TABLE 9-3: PORTB FUNCTIONS
Name
Bit# Buffer
Function
RB0/INT0
RB1/INT1
RB2/CANTX/
INT2
bit 0 TTL/ST⁽¹⁾ Input/output pin or external interrupt 0 input.
Internal software programmable weak pull-up.
bit 1 TTL/ST⁽¹⁾ Input/output pin or external interrupt 1 input.
Internal software programmable weak pull-up.
bit 2 TTL/ST⁽¹⁾ Input/output pin, CAN bus transmit pin or external interrupt 2 input.
Internal software programmable weak pull-up.
RB3/CANRX bit 3
TTL Input/output pin or CAN bus receive pin.
Internal software programmable weak pull-up.
RB4
bit 4
TTL Input/output pin (with interrupt-on-change).
Internal software programmable weak pull-up.
RB5/PGM
RB6/PGC
RB7/PGD
bit 5
TTL Input/output pin (with interrupt-on-change). Internal software programmable
weak pull-up. Low-voltage serial programming enable.
bit 6 TTL/ST⁽²⁾ Input/output pin (with interrupt-on-change). Internal software programmable
weak pull-up. Serial programming clock.
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.
TABLE 9-4: SUMMARY OF REGISTERS ASSOCIATED WITH PORTB
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
LATB
LATB Data Output Register
TRISB
PORTB Data Direction Register
INTCON GIE/GIEH PEIE/GIEL TMR0IE INT0IE
RBIE TMR0IF
INTCON2 RBPU INTEDG0 INTEDG1
—
—
TMR0IP
INTCON3 INT2IP INT1IP
—
INT2IE INT1IE
—
Legend: x = unknown, u = unchanged. Shaded cells are not used by PORTB.
RB1
INT0IF
—
INT2IF
RB0
RBIF
RBIP
INT1IF
xxxx xxxx
xxxx xxxx
1111 1111
0000 000x
111- -1-1
11-0 0-00
uuuu uuuu
uuuu uuuu
1111 1111
0000 000u
111- -1-1
11-1 0-00
 2004 Microchip Technology Inc.
DS41159D-page 99