
PIC16F84A
DS35007B-page 18
2001 Microchip Technology Inc.
TABLE 4-3:
PORTB FUNCTIONS
TABLE 4-4:
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
0Bh,8Bh
INTCON
GIE
EEIE
T0IE
INTE
RBIE
T0IF
INTF
RBIF
0000 000x 0000 000u
Legend: x = unknown, u = unchanged. Shaded cells are not used by PORTB.