8.4.1 Transition to Standby Mode................................................................................. 188
8.4.2 Canceling Standby Mode ..................................................................................... 189
8.4.3 Clock Pause Function........................................................................................... 190
8.5 Module Standby Function ................................................................................................. 191
8.5.1 Transition to Module Standby Function............................................................... 191
8.5.2 Clearing Module Standby Function...................................................................... 191
8.6 Timing of STATUS Pin Changes...................................................................................... 192
8.6.1 Timing for Resets................................................................................................. 192
8.6.2 Timing for Canceling Standby ............................................................................. 194
8.6.3 Timing for Canceling Sleep Mode ....................................................................... 196
8.7 Hardware Standby Mode................................................................................................... 199
8.7.1 Transition to Hardware Standby Mode ................................................................ 199
8.7.2 Canceling Hardware Standby Mode..................................................................... 199
8.7.3 Hardware Standby Mode Timing ......................................................................... 200
Section 9 On-Chip Oscillation Circuits......................................................................... 203
9.1 Overview........................................................................................................................... 203
9.1.1 Features ................................................................................................................ 203
9.2 Overview of CPG .............................................................................................................. 204
9.2.1 CPG Block Diagram............................................................................................. 204
9.2.2 CPG Pin Configuration ........................................................................................ 206
9.2.3 CPG Register Configuration................................................................................. 206
9.3 Clock Operating Modes..................................................................................................... 207
9.4 Register Descriptions......................................................................................................... 211
9.4.1 Frequency Control Register (FRQCR)................................................................. 211
9.5 Changing the Frequency.................................................................................................... 213
9.5.1 Changing the Multiplication Rate ........................................................................ 213
9.5.2 Changing the Division Ratio ................................................................................ 213
9.6 Overview of WDT............................................................................................................. 214
9.6.1 Block Diagram of WDT....................................................................................... 214
9.6.2 Register Configuration ......................................................................................... 214
9.7 WDT Registers.................................................................................................................. 215
9.7.1 Watchdog Timer Counter (WTCNT) ................................................................... 215
9.7.2 Watchdog Timer Control/Status Register (WTCSR) ........................................... 215
9.7.3 Notes on Register Access ..................................................................................... 217
9.8 Using the WDT ................................................................................................................. 218
9.8.1 Canceling Standby................................................................................................ 218
9.8.2 Changing the Frequency....................................................................................... 218
9.8.3 Using Watchdog Timer Mode.............................................................................. 219
9.8.4 Using Interval Timer Mode.................................................................................. 219
9.9 Notes on Board Design...................................................................................................... 220
Rev. 5.00, 09/03, page xxi of xliv
RENESAS [ RENESAS TECHNOLOGY CORP ]
