Rainbow Electronics AT89C5122 - Manual (Page 212)

212
4202E–SCR–06/06
AT8xC5122/23
Registers........................................................................................................... 162
Interrupt Sources and Vectors .......................................................................... 171
Microcontroller Reset ....................................................................... 172
Introduction ....................................................................................................... 172
Power On Reset (POR) .................................................................................... 173
Power Fail Detector (PFD)................................................................................ 173
Reset pin........................................................................................................... 175
Watchdog Timer ............................................................................................... 177
Power Management .......................................................................... 180
Idle Mode .......................................................................................................... 180
Power Down Mode ........................................................................................... 180
Reduced EMI Mode .......................................................................................... 181
USB Interface ................................................................................................... 182
Smart Card Interface ........................................................................................ 183
Keyboard Interface ........................................................................................... 184
Watchdog Timer during Power-down and Idle Mode........................................ 184
Registers........................................................................................................... 185
Electrical Characteristics ................................................................. 186
Absolute Maximum Ratings ..............................................................................186
DC Parameters .................................................................................................186
LED’s ................................................................................................................ 188
Smart Card Interface ........................................................................................ 189
USB Interface ................................................................................................... 192
AC Parameters ................................................................................................. 193
Float Waveforms............................................................................................... 199
Packaging Information ..................................................................... 201
Ordering Information......................................................................................... 201
Mechanical Dimensions.................................................................................... 203
Datasheet Revision History ............................................................. 209
Changes from 4202A to 4202B ........................................................................ 209
Changes from 4202B to 4202C ........................................................................ 209
Changes from 4202C to 4202D ........................................................................ 209
Changes from 4202D to 4202E ........................................................................ 209
Table of Contents ............................................................................. 210