AT90USB646 datasheet(426/434 Pages) ATMEL

426 / 434 page

7593A–AVR–02/06

AT90USB64/128

Table of Contents

Pin Configurations ................................................................................... 3

1.1

Disclaimer ............................................................................................................4

Overview ................................................................................................... 4

2.1

Block Diagram ......................................................................................................5

2.2

Pin Descriptions ...................................................................................................6

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

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

4.1

Introduction ..........................................................................................................9

4.2

Architectural Overview .........................................................................................9

4.3

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

4.4

Status Register ..................................................................................................11

4.5

General Purpose Register File ...........................................................................12

4.6

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

4.7

Instruction Execution Timing ..............................................................................14

4.8

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

AVR AT90USB64/128 Memories ........................................................... 18

5.1

In-System Reprogrammable Flash Program Memory .......................................18

5.2

SRAM Data Memory ..........................................................................................19

5.3

EEPROM Data Memory .....................................................................................22

5.4

I/O Memory ........................................................................................................28

5.5

External Memory Interface .................................................................................29

System Clock and Clock Options ......................................................... 38

6.1

Clock Systems and their Distribution .................................................................38

6.2

Clock Sources ....................................................................................................39

6.3

Low Power Crystal Oscillator .............................................................................40

6.4

Low Frequency Crystal Oscillator ......................................................................43

6.5

Calibrated Internal RC Oscillator .......................................................................43

6.6

128 kHz Internal Oscillator .................................................................................45

6.7

External Clock ....................................................................................................46

6.8

Clock Output Buffer ............................................................................................47

6.9

Timer/Counter Oscillator ....................................................................................47

6.10

System Clock Prescaler .....................................................................................47

6.11

PLL .....................................................................................................................49

AT90USB646 Datasheet(PDF) 426 Page - ATMEL Corporation

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