PIC16F870_13 Datasheet, PDF (36/172 Pages) Microchip Technology – 28/40-Pin, 8-Bit CMOS FLASH Microcontrollers

PIC16F870/871
TABLE 4-3: PORTB FUNCTIONS
Name
Bit#
Buffer
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/PGM
bit3
TTL/ST⁽¹⁾ Input/output pin or programming pin in LVP mode. 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/PGC
bit6
TTL/ST⁽²⁾ Input/output pin (with interrupt-on-change) or In-Circuit Debugger pin.
Internal software programmable weak pull-up. Serial programming clock.
RB7/PGD
bit7
TTL/ST⁽²⁾ Input/output pin (with interrupt-on-change) or In-Circuit Debugger pin.
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 or LVP mode.
2: This buffer is a Schmitt Trigger input when used in Serial Programming mode.
TABLE 4-4: SUMMARY OF REGISTERS ASSOCIATED WITH PORTB
Address
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
06h, 106h PORTB
RB7
RB6
RB5 RB4 RB3 RB2 RB1 RB0 xxxx xxxx uuuu uuuu
86h, 186h TRISB
PORTB Data Direction Register
1111 1111 1111 1111
81h, 181h 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.
DS30569C-page 36
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