PIC16F84A datasheet(4/68 Pages) MICROCHIP

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PIC16F84A

DS35007A-page 4

Preliminary

TABLE 1-1

PIC16F84A PINOUT DESCRIPTION

Pin Name

DIP

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.

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

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

PIC16F84A Datasheet(PDF) 4 Page - Microchip Technology

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