PIC16C641-04SLASHTQ datasheet(12/136 Pages) MICROCHIP

12 / 136 page

PIC16C64X & PIC16C66X

DS30559A-page 12

Preliminary

TABLE 3-1:

PIC16C641/642 PINOUT DESCRIPTION

Name

Pin #

I/O/P

Type

Buffer

Type

Description

OSC1/CLKIN

ST/CMOS Oscillator crystal input or external clock source input.

OSC2/CLKOUT

—

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/VPP

I/P

Master clear (reset) input or programming voltage input. This pin is

an active low reset to the device.

PORTA is a bi-directional I/O port.

RA0/AN0

I/O

Analog comparator input.

RA1/AN1

I/O

Analog comparator input.

RA2/AN2/VREF

I/O

Analog comparator input or VREF output.

RA3/AN3

I/O

Analog comparator input or comparator output.

RA4/T0CKI

I/O

Can be selected to be the clock input to the Timer0 timer/counter

or a comparator output. Output is open drain type.

RA5

I/O

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

grammed for internal weak pull-ups on all inputs.

RB0/INT

I/O

TTL/ST(1)

RB0 can also be selected as an external interrupt pin.

RB1

I/O

TTL

RB2

I/O

TTL

RB3

I/O

TTL

RB4

I/O

TTL

Interrupt on change pin.

RB5

I/O

TTL

Interrupt on change pin.

RB6

I/O

TTL/ST(2)

Interrupt on change pin. Serial programming clock.

RB7

I/O

TTL/ST(2)

Interrupt on change pin. Serial programming data.

PORTC is a bi-directional I/O port.

RC0

I/O

RC1

I/O

RC2

I/O

RC3

I/O

RC4

I/O

RC5

I/O

RC6

I/O

RC7

I/O

VSS

8,19

—

Ground reference for logic and I/O pins.

VDD

—

Positive supply for logic and I/O pins.

Legend:

O = output

I/O = input/output

P = power

I = input

— = not used

ST = Schmitt Trigger input

TTL = TTL input

Note 1: This buffer is a Schmitt Trigger input when conﬁgured as the external interrupt.

2: This buffer is a Schmitt Trigger input when used in serial programming mode.

PIC16C641-04/TQ Datasheet(PDF) 12 Page - Microchip Technology

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