AT90USB82 datasheet(300/306 Pages) ATMEL

300 / 306 page

7707D–AVR–07/08

AT90USB82/162

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

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

1.1 Disclaimer ................................................................................................................3

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

2.1 Block Diagram .........................................................................................................4

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

About Code Examples ............................................................................. 7

AVR CPU Core .......................................................................................... 8

4.1 Introduction ..............................................................................................................8

4.2 Architectural Overview .............................................................................................8

4.3 ALU – Arithmetic Logic Unit .....................................................................................9

4.4 Status Register ........................................................................................................9

4.5 General Purpose Register File ..............................................................................11

4.6 Stack Pointer .........................................................................................................12

4.7 Instruction Execution Timing .................................................................................12

4.8 Reset and Interrupt Handling .................................................................................13

AVR AT90USB82/162 Memories ........................................................... 16

5.1 In-System Reprogrammable Flash Program Memory ...........................................16

5.2 SRAM Data Memory ..............................................................................................17

5.3 EEPROM Data Memory ........................................................................................18

5.4 I/O Memory ............................................................................................................24

System Clock and Clock Options ......................................................... 25

6.1 Clock Systems and their Distribution .....................................................................25

6.2 Clock Switch ..........................................................................................................26

6.3 Clock Sources .......................................................................................................29

6.4 Low Power Crystal Oscillator .................................................................................30

6.5 Calibrated Internal RC Oscillator ...........................................................................32

6.6 External Clock .......................................................................................................34

6.7 Clock Output Buffer ...............................................................................................34

6.8 System Clock Prescaler ........................................................................................34

6.9 PLL ........................................................................................................................36

Power Distribution ................................................................................. 39

Power Management and Sleep Modes ................................................. 41

AT90USB82 Datasheet(PDF) 300 Page - ATMEL Corporation