PIC16F87X
TABLE 1-2:
PIC16F874 AND PIC16F877 PINOUT DESCRIPTION
DIP
Pin#
PLCC
Pin#
QFP
Pin#
I/O/P
Type
Buffer
Type
Pin Name
Description
(4)
OSC1/CLKIN
13
14
14
15
30
31
I
Oscillator crystal input/external clock source input.
ST/CMOS
OSC2/CLKOUT
O
—
Oscillator crystal output. Connects to crystal or resonator in
crystal oscillator mode. In RC mode, OSC2 pin outputs CLK-
OUT which has 1/4 the frequency of OSC1, and denotes the
instruction cycle rate.
MCLR/VPP/THV
1
2
18
I/P
ST
Master clear (reset) input or programming voltage input or high
voltage test mode control. This pin is an active low reset to the
device.
PORTA is a bi-directional I/O port.
RA0 can also be analog input0
RA1 can also be analog input1
RA0/AN0
2
3
4
3
4
5
19
20
21
I/O
I/O
I/O
TTL
TTL
TTL
RA1/AN1
RA2/AN2/VREF-
RA2 can also be analog input2 or negative analog
reference voltage
RA3/AN3/VREF+
RA4/T0CKI
5
6
7
6
7
8
22
23
24
I/O
I/O
I/O
TTL
ST
RA3 can also be analog input3 or positive analog
reference voltage
RA4 can also be the clock input to the Timer0 timer/
counter. Output is open drain type.
RA5/SS/AN4
TTL
RA5 can also be analog input4 or the slave select for the
synchronous serial port.
PORTB is a bi-directional I/O port. PORTB can be software
programmed for internal weak pull-up on all inputs.
(1)
RB0/INT
33
36
8
I/O
RB0 can also be the external interrupt pin.
TTL/ST
TTL
RB1
34
35
36
37
38
39
37
38
39
41
42
43
9
I/O
I/O
I/O
I/O
I/O
I/O
RB2
10
11
14
15
16
TTL
RB3/PGM
RB4
TTL
RB3 can also be the low voltage programming input
Interrupt on change pin.
TTL
RB5
TTL
Interrupt on change pin.
(2)
RB6/PGC
Interrupt on change pin or In-Circuit Debugger pin. Serial
programming clock.
TTL/ST
(2)
RB7/PGD
40
44
17
I/O
Interrupt on change pin or In-Circuit Debugger pin. Serial
programming data.
TTL/ST
PORTC is a bi-directional I/O port.
RC0/T1OSO/T1CKI
RC1/T1OSI/CCP2
RC2/CCP1
15
16
17
18
23
24
25
26
16
18
19
20
25
26
27
29
32
35
36
37
42
43
44
1
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
ST
ST
ST
ST
ST
ST
ST
ST
RC0 can also be the Timer1 oscillator output or a Timer1
clock input.
RC1 can also be the Timer1 oscillator input or Capture2
input/Compare2 output/PWM2 output.
RC2 can also be the Capture1 input/Compare1 output/
PWM1 output.
RC3/SCK/SCL
RC4/SDI/SDA
RC5/SDO
RC3 can also be the synchronous serial clock input/output
2
for both SPI and I C modes.
RC4 can also be the SPI Data In (SPI mode) or
2
data I/O (I C mode).
RC5 can also be the SPI Data Out
(SPI mode).
RC6/TX/CK
RC6 can also be the USART Asynchronous Transmit or
Synchronous Clock.
RC7/RX/DT
RC7 can also be the USART Asynchronous Receive or
Synchronous Data.
Legend: I = input
O = output
— = Not used
I/O = input/output
TTL = TTL input
P = power
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.
DS30292B-page 8
1999 Microchip Technology Inc.
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