AT43USB325 datasheet(107/109 Pages) ATMEL

107 / 109 page

3355C–USB–4/05

AT43USB325

Table of Contents

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

Description ............................................................................................... 1

1.1Pin Configuration .......................................................................................................2

1.2Pin Assignment .........................................................................................................3

1.3Signal Description .....................................................................................................4

Architectural Overview ............................................................................ 7

General-purpose Register File ................................................................ 9

3.1X-, Y- and Z- Registers ............................................................................................10

3.2Arithmetic Logic Unit (ALU) .....................................................................................10

3.3Program Memory .....................................................................................................10

3.4SPI Serial EEPROM Interface (AT43USB325E Only) .............................................11

3.5SRAM Data Memory ...............................................................................................12

3.6I/O Memory ..............................................................................................................17

3.7USB Hub .................................................................................................................18

Functional Description .......................................................................... 20

4.1On-chip Power Supply .............................................................................................20

4.2I/O Pin Characteristics .............................................................................................20

4.3Oscillator and PLL ...................................................................................................20

4.4Reset and Interrupt Handling ..................................................................................21

4.5Reset Sources .........................................................................................................23

4.6Power-on Reset .......................................................................................................24

4.7External Reset .........................................................................................................25

4.8Watchdog Timer Reset ............................................................................................25

4.9Non-USB Related Interrupt Handling ......................................................................26

4.10External Interrupts .................................................................................................29

4.11Interrupt Response Time .......................................................................................29

4.12USB Interrupt Sources ..........................................................................................31

4.13USB Endpoint Interrupt Sources ...........................................................................32

AVR Register Set ................................................................................... 40

5.1Status Register and Stack Pointer ..........................................................................40

5.2Sleep Modes ...........................................................................................................41

AT43USB325 Datasheet(PDF) 107 Page - ATMEL Corporation