PIC16F84A datasheet(3/68 Pages) MICROCHIP

3 / 68 page

PIC16F84A

Preliminary

DS35007A-page 3

1.0

DEVICE OVERVIEW

This document contains device-speciﬁc information for

the operation of the PIC16F84A device. Additional

information may be found in the PICmicro™ Mid-Range

Reference Manual, (DS33023), which may be down-

loaded from the Microchip website. The Reference

Manual should be considered a complementary docu-

ment to this data sheet, and is highly recommended

reading for a better understanding of the device archi-

tecture and operation of the peripheral modules.

The PIC16F84A belongs to the mid-range family of the

PICmicro™ microcontroller devices. A block diagram of

the device is shown in Figure 1-1.

The program memory contains 1K words, which trans-

lates to 1024 instructions, since each 14-bit program

memory word is the same width as each device instruc-

tion. The data memory (RAM) contains 68 bytes. Data

EEPROM is 64 bytes.

There are also 13 I/O pins that are user-conﬁgured on

a pin-to-pin basis. Some pins are multiplexed with other

device functions. These functions include:

• External interrupt

• Change on PORTB interrupt

• Timer0 clock input

Table 1-1 details the pinout of the device with descrip-

tions and details for each pin.

FIGURE 1-1:

PIC16F84A BLOCK DIAGRAM

Flash

Program

Memory

Program Counter

Program

Bus

Instruction reg

8 Level Stack

(13-bit)

Direct Addr

Instruction

Decode &

Control

Timing

Generation

OSC2/CLKOUT

OSC1/CLKIN

Power-up

Timer

Oscillator

Start-up Timer

Power-on

Reset

Watchdog

Timer

MCLR

VDD, VSS

W reg

ALU

MUX

I/O Ports

TMR0

STATUS reg

FSR reg

Indirect

Addr

RA3:RA0

RB7:RB1

RA4/T0CKI

EEADR

EEPROM

Data Memory

64 x 8

EEDATA

Addr Mux

RAM Addr

RAM

File Registers

EEPROM Data Memory

Data Bus

RB0/INT

PIC16F84A

1K x 14

PIC16F84A

68 x 8

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