PIC16F870SLASHP datasheet(8/156 Pages) MICROCHIP

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PIC16F870/871

DS30569A-page 8

Preliminary

TABLE 1-2:

PIC16F871 PINOUT DESCRIPTION

Pin Name

DIP

Pin#

PLCC

Pin#

QFP

Pin#

I/O/P

Type

Buffer

Type

Description

OSC1/CLKIN

ST/CMOS(4)

Oscillator crystal input/external clock source input.

OSC2/CLKOUT

—

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

I/P

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

I/O

TTL

RA0 can also be analog input0

RA1/AN1

I/O

TTL

RA1 can also be analog input1

RA2/AN2/VREF-

I/O

TTL

RA2 can also be analog input2 or negative analog

reference voltage

RA3/AN3/VREF+

I/O

TTL

RA3 can also be analog input3 or positive analog

reference voltage

RA4/T0CKI

I/O

RA4 can also be the clock input to the Timer0 timer/

counter. Output is open drain type.

RA5/AN4

I/O

TTL

RA5 can also be analog input4

PORTB is a bi-directional I/O port. PORTB can be software

programmed for internal weak pull-up on all inputs.

RB0/INT

I/O

TTL/ST(1)

RB0 can also be the external interrupt pin.

RB1

I/O

TTL

RB2

I/O

TTL

RB3/PGM

I/O

TTL/ST(1)

RB3 can also be the low voltage programming input

RB4

I/O

TTL

Interrupt on change pin.

RB5

I/O

TTL

Interrupt on change pin.

RB6/PGC

I/O

TTL/ST(2)

Interrupt on change pin or In-Circuit Debugger pin. Serial

programming clock.

RB7/PGD

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

I/O

RC0 can also be the Timer1 oscillator output or a Timer1

clock input.

RC1/T1OSI

I/O

RC1 can also be the Timer1 oscillator input

RC2/CCP1

I/O

RC2 can also be the Capture1 input/Compare1 output/

PWM1 output.

RC3

I/O

RC4

I/O

RC5

I/O

RC6/TX/CK

I/O

RC6 can also be the USART Asynchronous Transmit or

Synchronous Clock.

RC7/RX/DT

I/O

RC7 can also be the USART Asynchronous Receive or

Synchronous Data.

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 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.

PIC16F870/P Datasheet(PDF) 8 Page - Microchip Technology

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