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7647H–AVR–03/12
Atmel ATmega16/32/64/M1/C1
34. Table of Contents
Features ...................................................................................................1
1 Pin Configurations .................................................................................3
1.1 Pin Descriptions ..............................................................................................5
2 Overview .................................................................................................8
2.1 Block Diagram ................................................................................................8
2.2 Automotive Quality Grade ..............................................................................9
2.3 Pin Descriptions ............................................................................................10
2.4 About Code Examples ..................................................................................11
3 AVR CPU Core ..................................................................................12
3.1 Introduction ...................................................................................................12
3.2 Architectural Overview ..................................................................................12
3.3 ALU – Arithmetic Logic Unit ..........................................................................13
3.4 Status Register .............................................................................................14
3.5 General Purpose Register File .....................................................................15
3.6 Stack Pointer ................................................................................................16
3.7 Instruction Execution Timing ........................................................................17
3.8 Reset and Interrupt Handling ........................................................................17
4 Memories ..............................................................................................20
4.1 In-System Reprogrammable Flash Program Memory ..................................20
4.2 SRAM Data Memory .....................................................................................21
4.3 EEPROM Data Memory ...............................................................................22
4.4 I/O Memory ...................................................................................................28
4.5 General Purpose I/O Registers ....................................................................28
5 System Clock .......................................................................................29
5.1 Clock Systems and their Distribution ............................................................29
5.2 Clock Sources ..............................................................................................30
5.3 Default Clock Source ....................................................................................31
5.4 Low Power Crystal Oscillator ........................................................................31
5.5 Calibrated Internal RC Oscillator ..................................................................33
5.6 PLL ...............................................................................................................34
5.7 128 kHz Internal Oscillator ...........................................................................36
5.8 External Clock ..............................................................................................36
5.9 Clock Output Buffer ......................................................................................37
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