Atmel AVR AT90CAN128, Manual

Page: 421 / 428

421
7679H–CAN–08/08
AT90CAN32/64/128
Features ..................................................................................................... 1
1 Description ............................................................................................... 2
1.1 Comparison Between AT90CAN32, AT90CAN64 and AT90CAN128 ................2
1.2 Part Description ..................................................................................................2
1.3 Disclaimer ...........................................................................................................3
1.4 Block Diagram ....................................................................................................4
1.5 Pin Configurations ..............................................................................................5
1.6 Pin Descriptions ..................................................................................................6
2 About Code Examples ............................................................................. 8
3 AVR CPU Core .......................................................................................... 9
3.1 Introduction .........................................................................................................9
3.2 Architectural Overview ........................................................................................9
3.3 ALU – Arithmetic Logic Unit ..............................................................................10
3.4 Status Register .................................................................................................11
3.5 General Purpose Register File .........................................................................12
3.6 Stack Pointer ....................................................................................................14
3.7 Instruction Execution Timing .............................................................................14
3.8 Reset and Interrupt Handling ............................................................................15
4 Memories ................................................................................................ 18
4.1 In-System Reprogrammable Flash Program Memory ......................................18
4.2 SRAM Data Memory .........................................................................................19
4.3 EEPROM Data Memory ....................................................................................22
4.4 I/O Memory .......................................................................................................27
4.5 External Memory Interface ................................................................................27
4.6 General Purpose I/O Registers .........................................................................36
5 System Clock ......................................................................................... 37
5.1 Clock Systems and their Distribution ................................................................37
5.2 Clock Sources ...................................................................................................38
5.3 Default Clock Source ........................................................................................38
5.4 Crystal Oscillator ...............................................................................................39
5.5 Low-frequency Crystal Oscillator ......................................................................40
5.6 Calibrated Internal RC Oscillator ......................................................................41
5.7 External Clock ...................................................................................................42
5.8 Clock Output Buffer ..........................................................................................43