Datasheet

PIC16F8X
DS30430D-page 24  1996-2013 Microchip Technology Inc.
EXAMPLE 5-1: INITIALIZING PORTB
CLRF PORTB ; Initialize PORTB by
; setting output
; data latches
BSF STATUS, RP0 ; Select Bank 1
MOVLW 0xCF ; Value used to
; initialize data
; direction
MOVWF TRISB ; Set RB<3:0> as inputs
; RB<5:4> as outputs
; RB<7:6> as inputs
TABLE 5-3 PORTB FUNCTIONS
TABLE 5-4 SUMMARY OF REGISTERS ASSOCIATED WITH PORTB
Name Bit Buffer Type I/O Consistency Function
RB0/INT bit0 TTL/ST
(1)
Input/output pin or external interrupt input. Internal software
programmable weak pull-up.
RB1 bit1 TTL Input/output pin. Internal software programmable weak pull-up.
RB2 bit2 TTL Input/output pin. Internal software programmable weak pull-up.
RB3 bit3 TTL Input/output pin. Internal software programmable weak pull-up.
RB4 bit4 TTL Input/output pin (with interrupt on change). Internal software programmable
weak pull-up.
RB5 bit5 TTL Input/output pin (with interrupt on change). Internal software programmable
weak pull-up.
RB6 bit6 TTL/ST
(2)
Input/output pin (with interrupt on change). Internal software programmable
weak pull-up. Serial programming clock.
RB7 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.
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.
Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Value on
Power-on
Reset
Value on all
other resets
06h PORTB RB7 RB6 RB5 RB4 RB3 RB2 RB1 RB0/INT xxxx xxxx uuuu uuuu
86h TRISB TRISB7 TRISB6 TRISB5 TRISB4 TRISB3 TRISB2 TRISB1 TRISB0 1111 1111 1111 1111
81h
OPTION_
REG
RBPU
INTEDG T0CS T0SE PSA PS2 PS1 PS0
1111 1111 1111 1111
Legend: x = unknown, u = unchanged. Shaded cells are not used by PORTB.