ATmega64A datasheet(385/392 Pages) ATMEL

385 / 392 page

8160C–AVR–07/09

ATmega64A

Table of Contents

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

Pin Configuration ..................................................................................... 2

Overview ................................................................................................... 3

2.1

Block Diagram ...................................................................................................3

2.2

ATmega103 and ATmega64A Compatibility .....................................................4

2.3

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

Resources ................................................................................................. 7

Data Retention .......................................................................................... 7

About Code Examples ............................................................................. 8

AVR CPU Core .......................................................................................... 9

6.1

Overview ............................................................................................................9

6.2

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

6.3

Status Register ................................................................................................10

6.4

Stack Pointer ...................................................................................................13

6.5

Instruction Execution Timing ...........................................................................13

6.6

Reset and Interrupt Handling ...........................................................................14

6.7

Interrupt Response Time .................................................................................16

AVR Memories ........................................................................................ 17

7.1

In-System Reprogrammable Flash Program Memory .....................................17

7.2

SRAM Data Memory ........................................................................................18

7.3

EEPROM Data Memory ..................................................................................21

7.4

I/O Memory ......................................................................................................22

7.5

External Memory Interface ..............................................................................23

7.6

System Clock and Clock Options ......................................................... 37

8.1

Clock Systems and their Distribution ...............................................................37

8.2

Clock Sources .................................................................................................38

8.3

Default Clock Source .......................................................................................38

8.4

Crystal Oscillator .............................................................................................39

8.5

Low-frequency Crystal Oscillator .....................................................................40

8.6

External RC Oscillator .....................................................................................41

8.7

Calibrated Internal RC Oscillator .....................................................................42

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