PIC16F877ATISLASHML datasheet(12/234 Pages) MICROCHIP

12 / 234 page

PIC16F87XA

DS39582B-page 10

 2003 Microchip Technology Inc.

TABLE 1-3:

PIC16F874A/877A PINOUT DESCRIPTION

Pin Name

PDIP

Pin#

PLCC

Pin#

TQFP

Pin#

QFN

Pin#

I/O/P

Type

Buffer

Type

Description

OSC1/CLKI

OSC1

CLKI

ST/CMOS(4) Oscillator crystal or external clock input.

Oscillator crystal input or external clock source

input. ST buffer when configured in RC mode;

otherwise CMOS.

External clock source input. Always associated

with pin function OSC1 (see OSC1/CLKI,

OSC2/CLKO pins).

OSC2/CLKO

OSC2

CLKO

—

Oscillator crystal or clock output.

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

MCLR

VPP

Master Clear (input) or programming voltage (output).

Master Clear (Reset) input. This pin is an active

low Reset to the device.

Programming voltage input.

PORTA is a bidirectional I/O port.

RA0/AN0

RA0

AN0

I/O

TTL

Digital I/O.

Analog input 0.

RA1/AN1

RA1

AN1

I/O

TTL

Digital I/O.

Analog input 1.

RA2/AN2/VREF-/CVREF

RA2

AN2

VREF-

CVREF

I/O

TTL

Digital I/O.

Analog input 2.

A/D reference voltage (Low) input.

Comparator VREF output.

RA3/AN3/VREF+

RA3

AN3

VREF+

I/O

TTL

Digital I/O.

Analog input 3.

A/D reference voltage (High) input.

RA4/T0CKI/C1OUT

RA4

T0CKI

C1OUT

I/O

Digital I/O – Open-drain when configured as

output.

Timer0 external clock input.

Comparator 1 output.

RA5/AN4/SS/C2OUT

RA5

AN4

C2OUT

I/O

TTL

Digital I/O.

Analog input 4.

SPI slave select input.

Comparator 2 output.

Legend:

I = input

O = output

I/O = input/output

P = power

— = Not used

TTL = TTL input

ST = Schmitt Trigger input

Note

This buffer is a Schmitt Trigger input when configured as the external interrupt.

This buffer is a Schmitt Trigger input when used in Serial Programming mode.

This buffer is a Schmitt Trigger input when configured in RC Oscillator mode and a CMOS input otherwise.

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