PIC16F74 datasheet(12/174 Pages) MICROCHIP

12 / 174 page

PIC16F7X

DS30325B-page 10

 2002 Microchip Technology Inc.

TABLE 1-3:

PIC16F74 AND PIC16F77 PINOUT DESCRIPTION

Pin Name

DIP

Pin#

PLCC

Pin#

QFP

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 bi-directional 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

RA2

AN2

I/O

TTL

Digital I/O.

Analog input 2.

RA3/AN3/VREF

RA3

AN3

VREF

I/O

TTL

Digital I/O.

Analog input 3.

A/D reference voltage input.

RA4/T0CKI

RA4

T0CKI

I/O

Digital I/O – Open drain when configured as output.

Timer0 external clock input.

RA5/SS/AN4

RA5

AN4

I/O

TTL

Digital I/O.

SPI slave select input.

Analog input 4.

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 an external interrupt.

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.

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