PIC16F631 datasheet(16/294 Pages) MICROCHIP

16 / 294 page

PIC16F631/677/685/687/689/690

DS41262D-page 14

TABLE 1-1:

PINOUT DESCRIPTION – PIC16F631

Name

Function

Input

Type

Output

Type

Description

RA0/C1IN+/ICSPDAT/ULPWU

RA0

TTL

CMOS General purpose I/O. Individually controlled interrupt-on-change.

Individually enabled pull-up.

C1IN+

—

Comparator C1 non-inverting input.

ICSPDAT

CMOS ICSP™ Data I/O.

ULPWU

—

Ultra Low-Power Wake-up input.

RA1/C12IN0-/ICSPCLK

RA1

TTL

CMOS General purpose I/O. Individually controlled interrupt-on-change.

Individually enabled pull-up.

C12IN0-

—

Comparator C1 or C2 inverting input.

ICSPCLK

—

ICSP™ clock.

RA2/T0CKI/INT/C1OUT

RA2

CMOS General purpose I/O. Individually controlled interrupt-on-change.

Individually enabled pull-up.

T0CKI

—

Timer0 clock input.

INT

—

External interrupt pin.

C1OUT

—

CMOS Comparator C1 output.

RA3/MCLR/VPP

RA3

TTL

—

General purpose input. Individually controlled interrupt-on-

change.

MCLR

—

Master Clear with internal pull-up.

VPP

—

Programming voltage.

RA4/T1G/OSC2/CLKOUT

RA4

TTL

CMOS General purpose I/O. Individually controlled interrupt-on-change.

Individually enabled pull-up.

T1G

—

Timer1 gate input.

OSC2

—

XTAL

Crystal/Resonator.

CLKOUT

—

CMOS FOSC/4 output.

RA5/T1CKI/OSC1/CLKIN

RA5

TTL

CMOS General purpose I/O. Individually controlled interrupt-on-change.

Individually enabled pull-up.

T1CKI

—

Timer1 clock input.

OSC1

XTAL

—

Crystal/Resonator.

CLKIN

—

External clock input/RC oscillator connection.

RB4

TTL

CMOS General purpose I/O. Individually controlled interrupt-on-change.

Individually enabled pull-up.

RB5

TTL

CMOS General purpose I/O. Individually controlled interrupt-on-change.

Individually enabled pull-up.

RB6

TTL

CMOS General purpose I/O. Individually controlled interrupt-on-change.

Individually enabled pull-up.

RB7

TTL

CMOS General purpose I/O. Individually controlled interrupt-on-change.

Individually enabled pull-up.

RC0/C2IN+

RC0

CMOS General purpose I/O.

C2IN+

—

Comparator C2 non-inverting input.

RC1/C12IN1-

RC1

CMOS General purpose I/O.

C12IN1-

—

Comparator C1 or C2 inverting input.

RC2/C12IN2-

RC2

CMOS General purpose I/O.

C12IN2-

—

Comparator C1 or C2 inverting input.

RC3/C12IN3-

RC3

CMOS General purpose I/O.

C12IN3-

—

Comparator C1 or C2 inverting input.

RC4/C2OUT

RC4

CMOS General purpose I/O.

C2OUT

—

CMOS Comparator C2 output.

RC5

CMOS General purpose I/O.

Legend:

= Analog input or output

CMOS = CMOS compatible input or output

TTL = TTL compatible input

= Schmitt Trigger input with CMOS levels

= High Voltage

XTAL

= Crystal

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