PIC16F84A_13 Datasheet, PDF (18/90 Pages) Microchip Technology – 18-pin Enhanced FLASH/EEPROM 8-Bit Microcontroller

PIC16F84A
TABLE 4-3: PORTB FUNCTIONS
Name
Bit Buffer Type
I/O Consistency Function
RB0/INT
RB1
RB2
bit0
TTL/ST⁽¹⁾ Input/output pin or external interrupt input.
Internal software programmable weak pull-up.
bit1
TTL
Input/output pin. Internal software programmable weak pull-up.
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.
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
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.
DS35007C-page 18
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