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ATTINY12
(Rev.:2003)

8-bit Microcontroller with 1K Byte Flash

Atmel Corporation 

Table of Contents

1006D–AVR–07/03

ATtiny11/12

Features................................................................................................. 1

Pin Configuration.................................................................................. 1

Description ............................................................................................ 2

ATtiny11 Block Diagram ....................................................................................... 2

ATtiny12 Block Diagram ....................................................................................... 4

Pin Descriptions.................................................................................................... 5

Clock Options ....................................................................................................... 5

Architectural Overview......................................................................... 8

General-purpose Register File.............................................................................. 9

ALU – Arithmetic Logic Unit................................................................................ 10

Flash Program Memory ...................................................................................... 10

Program and Data Addressing Modes................................................................ 10

Subroutine and Interrupt Hardware Stack .......................................................... 12

EEPROM Data Memory...................................................................................... 13

Memory Access and Instruction Execution Timing ............................................. 13

I/O Memory ......................................................................................................... 14

Reset and Interrupt Handling.............................................................................. 15

ATtiny12 Internal Voltage Reference.................................................................. 24

Interrupt Handling ............................................................................................... 25

Sleep Modes for the ATtiny11 ............................................................................ 31

Sleep Modes for the ATtiny12 ............................................................................ 31

ATtiny12 Calibrated Internal RC Oscillator ......................................................... 32

Timer/Counter0 ................................................................................... 33

Timer/Counter Prescaler..................................................................................... 33

Watchdog Timer.................................................................................. 36

ATtiny12 EEPROM Read/Write Access............................................. 38

Prevent EEPROM Corruption ............................................................................. 40

Analog Comparator ............................................................................ 41

I/O Port B ............................................................................................. 43

Memory Programming........................................................................ 46

Program (and Data) Memory Lock Bits .............................................................. 46

Fuse Bits in ATtiny11.......................................................................................... 46

Fuse Bits in ATtiny12.......................................................................................... 46

Signature Bytes .................................................................................................. 47

Calibration Byte in ATtiny12 ............................................................................... 47

Programming the Flash and EEPROM............................................................... 47

High-voltage Serial Programming....................................................................... 48

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