
ii
AT43USB326
3313D–USB–04/06
Port E.................................................................................................................. 45
Programming the USB Module......................................................... 46
The USB Function .............................................................................................. 46
USB Registers.................................................................................................... 53
Endpoint Registers ............................................................................................. 54
USB Hub............................................................................................................. 62
Suspend and Resume........................................................................................ 72
Electrical Specification ..................................................................... 76
Absolute Maximum Ratings................................................................................ 76
DC Characteristics.............................................................................................. 76
Typical Application............................................................................ 84
Detailed Description............................................................................................ 84
Initial Check Byte................................................................................................ 85
Keyboard Matrix.................................................................................................. 85
Example of SEEPROM Data.............................................................................. 85
Example Schematics.......................................................................................... 94
Ordering Information......................................................................... 96
Packaging Information...................................................................... 97
48AA – LQFP ..................................................................................................... 97
Errata Sheet........................................................................................ 98
Problem .............................................................................................................. 98
Fix/Workaround .................................................................................................. 98
Revision History ................................................................................ 99
Table of Contents ................................................................................. i