PIC18FXX20 Datasheet, PDF (110/366 Pages) Microchip Technology – 64/80-Pin High Performance 1 Mbit Enhanced FLASH Microcontrollers with A/D

PIC18FXX20
TABLE 10-3: PORTB FUNCTIONS
Name
Bit#
Buffer
Function
RB0/INT0
bit0
RB1/INT1
bit1
RB2/INT2
bit2
RB3/CCP2⁽³⁾/INT3 bit3
TTL/ST⁽¹⁾
TTL/ST⁽¹⁾
TTL/ST⁽¹⁾
TTL/ST⁽⁴⁾
Input/output pin or external interrupt input0.
Internal software programmable weak pull-up.
Input/output pin or external interrupt input1.
Internal software programmable weak pull-up.
Input/output pin or external interrupt input2.
Internal software programmable weak pull-up.
Input/output pin, or external interrupt input3. 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
RB5/KBI1/PGM
RB6/KBI2/PGC
RB7/KBI3/PGD
bit4
TTL
Input/output pin (with interrupt-on-change).
Internal software programmable weak pull-up.
bit5 TTL/ST⁽²⁾ Input/output pin (with interrupt-on-change).
Internal software programmable weak pull-up.
Low voltage ICSP enable pin.
bit6 TTL/ST⁽²⁾ Input/output pin (with interrupt-on-change).
Internal software programmable weak pull-up.
Serial programming clock.
bit7 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.
TABLE 10-4: SUMMARY OF REGISTERS ASSOCIATED WITH PORTB
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
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 INTEDG2 INTEDG3 TMR0IP
INTCON3 INT2IP INT1IP INT3IE INT2IE INT1IE INT3IF
Legend: x = unknown, u = unchanged. Shaded cells are not used by PORTB.
RB1
INT0IF
INT3IP
INT2IF
Bit 0
RB0
RBIF
RBIP
INT1IF
Value on
POR,
BOR
Value on
all other
RESETS
xxxx xxxx
xxxx xxxx
1111 1111
0000 0000
uuuu uuuu
uuuu uuuu
1111 1111
0000 0000
1111 1111 1111 1111
1100 0000 1100 0000
DS39609A-page 108
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 2003 Microchip Technology Inc.