i
8209A–AVR–08/09
ATmega16M1/32M1/64M1
Table of Contents
Features ..................................................................................................... 1
1 Pin Configurations ................................................................................... 2
1.1 Pin Descriptions .................................................................................................3
2 Overview ................................................................................................... 5
2.1 Block Diagram ...................................................................................................6
2.2 Pin Descriptions .................................................................................................7
3 Disclaimer ................................................................................................. 9
4 Resources ................................................................................................. 9
5 About Code Examples ............................................................................. 9
6 Data Retention .......................................................................................... 9
7 AVR CPU Core ........................................................................................ 10
7.1 Overview ..........................................................................................................10
7.2 ALU – Arithmetic Logic Unit .............................................................................11
7.3 Status Register ................................................................................................11
7.4 General Purpose Register File ........................................................................13
7.5 Stack Pointer ...................................................................................................14
7.6 Instruction Execution Timing ...........................................................................15
7.7 Reset and Interrupt Handling ...........................................................................16
8 Memories ................................................................................................ 18
8.1 Overview ..........................................................................................................18
8.2 In-System Reprogrammable Flash Program Memory .....................................18
8.3 SRAM Data Memory ........................................................................................19
8.4 EEPROM Data Memory ..................................................................................20
8.5 I/O Memory ......................................................................................................21
8.6 General Purpose I/O Registers .......................................................................21
8.7 Register Description ........................................................................................22
9 System Clock and their Distribution .................................................... 27
9.1 Clock Systems and their Distribution ...............................................................27
9.2 Clock Sources .................................................................................................28
9.3 Default Clock Source .......................................................................................29
9.4 Low Power Crystal Oscillator ...........................................................................29
(2 pages)
(23 pages)
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