PIC16CR74ESLASHSP datasheet(12/172 Pages) MICROCHIP

12 / 172 page

PIC16CR7X

DS21993C-page 10

TABLE 1-3:

PIC16CR74 AND PIC16CR77 PINOUT DESCRIPTION

Pin Name

PDIP

Pin#

PLCC

Pin#

QFP

Pin#

I/O/P

Type

Buffer

Type

Description

OSC1/CLKIN

OSC1

CLKIN

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/CLKIN, OSC2/CLKOUT

pins).

OSC2/CLKOUT

OSC2

CLKOUT

—

Oscillator crystal or clock output.

Oscillator crystal output.

Connects to crystal or resonator in Crystal Oscillator

mode.

In RC mode, OSC2 pin outputs CLKOUT, which has 1/4

the frequency of OSC1 and denotes the instruction

cycle rate.

MCLR

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

Reset to the device.

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

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/AN4/SS

RA5

AN4

I/O

TTL

Digital I/O.

Analog input 4.

SPI slave select input.

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 Verify 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.

PIC16CR74E/SP Datasheet(PDF) 12 Page - Microchip Technology

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