PIC18F2220/2320/4220/4320
TABLE 10-3: PORTB FUNCTIONS
Name
Bit#
Buffer
Function
RB0/AN12/INT0
bit 0
TTL(1)/ST(2) Input/output pin, analog input or external interrupt input 0.
Internal software programmable weak pull-up.
RB1/AN10/INT1
RB2/AN8/INT2
RB3/AN9/CCP2
bit 1
bit 2
bit 3
TTL(1)/ST(2) Input/output pin, analog input or external interrupt input 1.
Internal software programmable weak pull-up.
TTL(1)/ST(2) Input/output pin, analog input or external interrupt input 2.
Internal software programmable weak pull-up.
TTL(1)/ST(3) Input/output pin or analog input. Capture2 input/Compare2 output/
PWM output when CCP2MX configuration bit is set(4)
Internal software programmable weak pull-up.
.
RB4/AN11/KBI0
RB5/KBI1/PGM
RB6/KBI2/PGC
RB7/KBI3/PGD
bit 4
bit 5
bit 6
bit 7
TTL
Input/output pin (with interrupt-on-change) or analog input.
Internal software programmable weak pull-up.
TTL/ST(5) Input/output pin (with interrupt-on-change). Internal software
programmable weak pull-up. Low-voltage ICSP enable pin.
TTL/ST(5) Input/output pin (with interrupt-on-change). Internal software
programmable weak pull-up. Serial programming clock.
TTL/ST(5) 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 TTL input when configured as digital I/O.
2: This buffer is a Schmitt Trigger input when configured as the external interrupt.
3: This buffer is a Schmitt Trigger input when configured as the CCP2 input.
4: A device configuration bit selects which I/O pin the CCP2 pin is multiplexed on.
5: This buffer is a Schmitt Trigger input when used in Serial Programming mode.
TABLE 10-4: SUMMARY OF REGISTERS ASSOCIATED WITH PORTB
Value on
all other
Resets
Value on
POR, BOR
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PORTB
LATB
RB7
RB6
RB5
RB4
RB3
RB2
RB1
RB0
xxxq qqqq
xxxx xxxx
1111 1111
0000 000x
1111 -1-1
uuuu uuuu
uuuu uuuu
1111 1111
0000 000u
1111 -1-1
11-0 0-00
--00 0000
LATB Data Latch Register
TRISB
PORTB Data Direction Register
GIE/GIEH PEIE/GIEL TMR0IE
INTCON
INTCON2
INTCON3
ADCON1
Legend:
INT0IE
RBIE
—
TMR0IF INT0IF
RBIF
RBIP
RBPU
INT2IP
—
INTEDG0 INTEDG1 INTEDG2
TMR0IP
—
—
INT1IP
—
—
INT2IE
VCFG0
INT1IE
INT2IF
INT1IF 11-0 0-00
VCFG1
PCFG3 PCFG2 PCFG1 PCFG0 --00 0000
x= unknown, u= unchanged, q= value depends on condition. Shaded cells are not used by PORTB.
DS39599C-page 106
2003 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
