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

PIC16F870/871
TABLE 1-2: PIC16F871 PINOUT DESCRIPTION
Pin Name
DIP PLCC QFP I/O/P
Pin# Pin# Pin# Type
Buffer
Type
Description
OSC1/CLKI
13
14
30
I
ST/CMOS^{(4) Oscillator crystal input/external clock source input.}
OSC2/CLKO
14
15
31
O
—
Oscillator crystal output. Connects to crystal or resonator in
Crystal Oscillator mode. In RC mode, OSC2 pin outputs CLKO,
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/AN0
2
3
19
I/O
TTL
RA0 can also be analog input 0.
RA1/AN1
3
4
20
I/O
TTL
RA1 can also be analog input 1.
RA2/AN2/VREF-
4
5
21
I/O
TTL
RA2 can also be analog input 2 or negative analog
reference voltage.
RA3/AN3/VREF+
5
6
22
I/O
TTL
RA3 can also be analog input 3 or positive analog
reference voltage.
RA4/T0CKI
6
7
23
I/O
ST
RA4 can also be the clock input to the Timer0
timer/counter. Output is open drain type.
RA5/AN4
7
8
24
I/O
TTL
RA5 can also be analog input 4.
PORTB is a bi-directional I/O port. PORTB can be software
programmed for internal weak pull-up on all inputs.
RB0/INT
33
36
8
I/O
TTL/ST⁽¹⁾
RB0 can also be the external interrupt pin.
RB1
34
37
9
I/O
TTL
RB2
35
38
10
I/O
TTL
RB3/PGM
36
39
11
I/O
TTL/ST⁽¹⁾
RB3 can also be the low voltage programming input.
RB4
37
41
14
I/O
TTL
Interrupt-on-change pin.
RB5
38
42
15
I/O
TTL
Interrupt-on-change pin.
RB6/PGC
39
43
16
I/O
TTL/ST⁽²⁾
Interrupt-on-change pin or In-Circuit Debugger pin.
Serial programming clock.
RB7/PGD
40
44
17
I/O
TTL/ST⁽²⁾
Interrupt-on-change pin or In-Circuit Debugger pin.
Serial programming data.
PORTC is a bi-directional I/O port.
RC0/T1OSO/T1CKI 15
16
32
I/O
ST
RC0 can also be the Timer1 oscillator output or a Timer1
clock input.
RC1/T1OSI
16
18
35
I/O
ST
RC1 can also be the Timer1 oscillator input.
RC2/CCP1
17
19
36
I/O
ST
RC2 can also be the Capture1 input/Compare1 output/
PWM1 output.
RC3
18
20
37
I/O
ST
RC4
23
25
42
I/O
ST
RC5
24
26
43
I/O
ST
RC6/TX/CK
25
27
44
I/O
ST
RC6 can also be the USART Asynchronous Transmit or
Synchronous Clock.
RC7/RX/DT
26
29
1
I/O
ST
RC7 can also be the USART Asynchronous Receive or
Synchronous Data.
Legend:
Note 1:
2:
3:
4:
I = input
O = output
I/O = input/output
P = power
— = Not used
TTL = TTL input
ST = Schmitt Trigger input
This buffer is a Schmitt Trigger input when configured as an external interrupt or LVP mode.
This buffer is a Schmitt Trigger input when used in Serial Programming mode.
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).
This buffer is a Schmitt Trigger input when configured in RC Oscillator mode and a CMOS input otherwise.
DS30569C-page 8
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