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2002 Microchip Technology Inc.
DS30325B-page 11
PIC16F7X
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
33
36
8
I/O
I
TTL/ST(1)
Digital I/O.
External interrupt.
RB1
34
37
9
I/O
TTL
Digital I/O.
RB2
353810
I/O
TTL
Digital I/O.
RB3/PGM
RB3
PGM
36
39
11
I/O
TTL
Digital I/O.
Low voltage ICSP programming enable pin.
RB4
374114
I/O
TTL
Digital I/O.
RB5
384215
I/O
TTL
Digital I/O.
RB6/PGC
RB6
PGC
39
43
16
I/O
TTL/ST(2)
Digital I/O.
In-Circuit Debugger and ICSP programming clock.
RB7/PGD
RB7
PGD
40
44
17
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
15
16
32
I/O
O
I
ST
Digital I/O.
Timer1 oscillator output.
Timer1 external clock input.
RC1/T1OSI/CCP2
RC1
T1OSI
CCP2
16
18
35
I/O
I
I/O
ST
Digital I/O.
Timer1 oscillator input.
Capture2 input, Compare2 output, PWM2 output.
RC2/CCP1
RC2
CCP1
17
19
36
I/O
ST
Digital I/O.
Capture1 input/Compare1 output/PWM1 output
RC3/SCK/SCL
RC3
SCK
SCL
18
20
37
I/O
ST
Digital I/O
Synchronous serial clock input/output for SPI mode.
Synchronous serial clock input/output for I2C mode.
RC4/SDI/SDA
RC4
SDI
SDA
23
25
42
I/O
I
I/O
ST
Digital I/O.
SPI data in.
I2C data I/O.
RC5/SDO
RC5
SDO
24
26
43
I/O
O
ST
Digital I/O.
SPI data out.
RC6/TX/CK
RC6
TX
CK
25
27
44
I/O
O
I/O
ST
Digital I/O.
USART asynchronous transmit.
USART 1 synchronous clock.
RC7/RX/DT
RC7
RX
DT
26
29
1
I/O
I
I/O
ST
Digital I/O.
USART asynchronous receive.
USART synchronous data.
TABLE 1-3:
PIC16F74 AND PIC16F77 PINOUT DESCRIPTION (CONTINUED)
Pin Name
DIP
Pin#
PLCC
Pin#
QFP
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 an external interrupt.
2:
This buffer is a Schmitt Trigger input when used in Serial Programming mode.
3:
This buffer is a Schmitt Trigger input when configured as general purpose I/O and a TTL input when used in the Parallel
Slave Port mode (for interfacing to a microprocessor bus).
4:
This buffer is a Schmitt Trigger input when configured in RC Oscillator mode and a CMOS input otherwise.
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