Datasheet

PIC16F872
DS30221C-page 6 © 2006 Microchip Technology Inc.
PORTB is a bi-directional I/O port. PORTB can be software
programmed for internal weak pull-up on all inputs.
RB0/INT
RB0
INT
21 I/O TTL/ST
(1)
Digital I/O.
External interrupt pin.
RB1 22 I/O TTL Digital I/O.
RB2 23 I/O TTL Digital I/O.
RB3/PGM
RB3
PGM
24 I/O TTL
Digital I/O.
Low voltage ICSP programming enable pin.
RB4 25 I/O TTL Digital I/O.
RB5 26 I/O TTL Digital I/O.
RB6/PGC
RB6
PGC
27 I/O TTL/ST
(2)
Digital I/O.
In-Circuit Debugger and ICSP programming clock.
RB7/PGD
RB7
PGD
28 I/O TTL/ST
(2)
Digital I/O.
In-Circuit Debugger and ICSP programming data.
PORTC is a bi-directional I/O port.
RC0/T1OSO/T1CKI
RC0
T1OSO
T1CKI
11 I/O ST
Digital I/O.
Timer1 oscillator output.
Timer1 clock input.
RC1/T1OSI
RC1
T1OSI
12 I/O ST
Digital I/O.
Timer1 oscillator input.
RC2/CCP1
RC2
CCP1
13 I/O ST
Digital I/O.
Capture1 input/Compare1 output/PWM1 output.
RC3/SCK/SCL
RC3
SCK
SCL
14 I/O ST
Digital I/O.
Synchronous serial clock input/output for SPI mode.
Synchronous serial clock input/output for I
2
C mode.
RC4/SDI/SDA
RC4
SDI
SDA
15 I/O ST
Digital I/O.
SPI Data In pin (SPI mode).
SPI Data I/O pin (I
2
C mode).
RC5/SDO
RC5
SDO
16 I/O ST
Digital I/O.
SPI Data Out pin (SPI mode).
RC6 17 I/O ST Digital I/O.
RC7 18 I/O ST Digital I/O.
V
SS 8, 19 P — Ground reference for logic and I/O pins.
VDD 20 P — Positive supply for logic and I/O pins.
TABLE 1-2: PIC16F872 PINOUT DESCRIPTION (CONTINUED)
Pin Name Pin#
I/O/P
Type
Buffer
Type
Description
Legend: I = input O = output I/O = input/output P = power
— = Not used TTL = TTL input ST = Schmitt Trigger input
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.