PIC16F84AT-20SLASHSSROM datasheet(6/88 Pages) MICROCHIP

6 / 88 page

PIC16F84A

DS35007B-page 4

TABLE 1-1:

PIC16F84A PINOUT DESCRIPTION

Pin Name

PDIP

No.

SOIC

No.

SSOP

No.

I/O/P

Type

Buffer

Type

Description

OSC1/CLKIN

ST/CMOS(3) Oscillator crystal input/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

I/P

Master Clear (Reset) input/programming voltage

input. This pin is an active low RESET to the device.

PORTA is a bi-directional I/O port.

RA0

I/O

TTL

RA1

I/O

TTL

RA2

I/O

TTL

RA3

I/O

TTL

RA4/T0CKI

I/O

Can also be selected to be the clock input to the

TMR0 timer/counter. Output is open drain type.

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

software programmed for internal weak pull-up on

all inputs.

RB0/INT

I/O

TTL/ST(1)

RB0/INT 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.

VSS

5,6

—

Ground reference for logic and I/O pins.

VDD

15,16

—

Positive supply for logic and I/O pins.

Legend: I= input

O = Output

I/O = Input/Output

P = Power

— = Not used

TTL = TTL input

ST = Schmitt Trigger 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.

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

PIC16F84AT-20/SSROM Datasheet(PDF) 6 Page - Microchip Technology

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