Hitachi SH7750 series Hardware Manual page 10

10.1.1 Features................................................................................................................ 197
10.2 Overview of CPG.............................................................................................................. 199
10.2.1 Block Diagram of CPG........................................................................................ 199
10.2.2 CPG Pin Configuration ........................................................................................ 201
10.2.3 CPG Register Configuration ................................................................................ 201
10.3 Clock Operating Modes .................................................................................................... 202
10.4 CPG Register Description ................................................................................................. 203
10.4.1 Frequency Control Register (FRQCR)................................................................. 203
10.5 Changing the Frequency ................................................................................................... 206
10.5.1 Changing PLL Circuit 1 Starting/Stopping (When PLL Circuit 2 is Off) ........... 206
10.5.2 Changing PLL Circuit 1 Starting/Stopping (When PLL Circuit 2 is On) ............ 206
10.5.3 Changing Bus Clock Division Ratio (When PLL Circuit 2 is On) ...................... 207
10.5.4 Changing Bus Clock Division Ratio (When PLL Circuit 2 is Off)...................... 207
10.5.5 Changing CPU or Peripheral Module Clock Division Ratio ............................... 207
10.6 Output Clock Control........................................................................................................ 207
10.7 Overview of Watchdog Timer .......................................................................................... 208
10.7.1 Block Diagram..................................................................................................... 208
10.7.2 Register Configuration......................................................................................... 209
10.8 WDT Register Descriptions .............................................................................................. 209
10.8.1 Watchdog Timer Counter (WTCNT)................................................................... 209
10.8.2 Watchdog Timer Control/Status Register (WTCSR)........................................... 210
10.8.3 Notes on Register Access..................................................................................... 212
10.9 Using the WDT ................................................................................................................. 212
10.9.1 Standby Clearing Procedure ................................................................................ 212
10.9.2 Frequency Changing Procedure ........................................................................... 213
10.9.3 Using Watchdog Timer Mode ............................................................................. 213
10.9.4 Using Interval Timer Mode ................................................................................. 214
10.10 Notes on Board Design ..................................................................................................... 214
Section 11 Realtime Clock (RTC)
11.1 Overview........................................................................................................................... 217
11.1.1 Features................................................................................................................ 217
11.1.2 Block Diagram..................................................................................................... 218
11.1.3 Pin Configuration................................................................................................. 219
11.1.4 Register Configuration......................................................................................... 219
11.2 Register Descriptions ........................................................................................................ 221
11.2.1 64 Hz Counter (R64CNT).................................................................................... 221
11.2.2 Second Counter (RSECCNT) .............................................................................. 221
11.2.3 Minute Counter (RMINCNT) .............................................................................. 222
11.2.4 Hour Counter (RHRCNT).................................................................................... 222
11.2.5 Day-of-Week Counter (RWKCNT)..................................................................... 223
11.2.6 Day Counter (RDAYCNT) .................................................................................. 224
11.2.7 Month Counter (RMONCNT) ............................................................................. 224
.................................................................................. 217
Rev. 4.0, 04/00, page xiii of 20