Pic16F84A

M

PIC16F84A

18-pin Enhanced Flash/EEPROM 8-Bit Microcontroller

Devices Included in this Data Sheet:

Pin Diagrams

• PIC16F84A
• Extended voltage range device available
(PIC16LF84A)

PDIP, SOIC
RA1

17

RA0

3

16

OSC1/CLKIN

MCLR

4

15

OSC2/CLKOUT

VSS

5

14

VDD

RB0/INT

6

13

RB7

RB1

7

12

RB6

RB2

8

11

RB5RB3

• Only 35 single word instructions to learn
• All instructions single cycle except for program
branches which are two-cycle
• Operating speed: DC - 20 MHz clock input
DC - 200 ns instruction cycle
• 1024 words of program memory
• 68 bytes of data RAM
• 64 bytes of data EEPROM
• 14-bit wide instruction words
• 8-bit wide data bytes
• 15 special function hardware registers• Eight-level deep hardware stack
• Direct, indirect and relative addressing modes
• Four interrupt sources:
- External RB0/INT pin
- TMR0 timer overflow
- PORTB interrupt on change
- Data EEPROM write complete

18

2

RA4/T0CKI

High Performance RISC CPU Features:

•1

RA3

9

10

RB4

SSOP
•1

20

RA1

RA3

2

19

RA0

RA4/T0CKI

3

18OSC1/CLKIN

MCLR
VSS

4

17

OSC2/CLKOUT

16

VSS

6

RB0/INT

7

14

VDD
VDD
RB7

RB1

8

13

RB6

RB2

9
10

12
11

RB5

RB3

• 13 I/O pins with individual direction control
• High current sink/source for direct LED drive
- 25 mA sink max. per pin
- 25 mA source max. per pin
• TMR0: 8-bit timer/counter with 8-bit
programmable prescaler

5PIC16F84A

RA2

Peripheral Features:

15

RB4

CMOS Enhanced Flash/EERPOM Technology:

Special Microcontroller Features:
• 1000 erase/write cycles Enhanced Flash program
memory
• 1,000,000 typical erase/write cycles EEPROM data
memory
• EEPROM Data Retention > 40 years
• In-Circuit Serial Programming (ICSP™) - via two
pins
• Power-on Reset (POR), Power-up Timer (PWRT),Oscillator Start-up Timer (OST)
• Watchdog Timer (WDT) with its own on-chip RC
oscillator for reliable operation
• Code-protection
• Power saving SLEEP mode
• Selectable oscillator options

© 1998 Microchip Technology Inc.

PIC16F84A

RA2

• Low-power, high-speed technology
• Fully static design
• Wide operating voltage range:
- Commercial: 2.0V to 5.5V
- Industrial:
2.0V to5.5V
• Low power consumption:
- < 2 mA typical @ 5V, 4 MHz
- 15 µA typical @ 2V, 32 kHz
- < 0.5 µA typical standby current @ 2V

Preliminary

DS35007A-page 1

PIC16F84A
Table of Contents
1.0 Device Overview ............................................................................................................................................................................ 32.0 Memory Organization..................................................................................................................................................................... 5
3.0 I/O Ports....................................................................................................................................................................................... 134.0 Timer0 Module ............................................................................................................................................................................. 17
5.0 Data EEPROM Memory............................................................................................................................................................... 19
6.0 SpecialFeatures of the CPU ....................................................................................................................................................... 21
7.0 Instruction Set Summary.............................................................................................................................................................. 33
8.0 Development Support...