SH7751 Datasheet, PDF (62/1224 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

9.9.1 In Reset ................................................................................................................ 255
9.9.2 In Exit from Standby Mode ................................................................................. 256
9.9.3 In Exit from Sleep Mode...................................................................................... 257
9.9.4 In Exit from Deep Sleep Mode ............................................................................ 260
9.9.5 Hardware Standby Mode Timing......................................................................... 262
9.10 Usage Notes ...................................................................................................................... 264
9.10.1 Note on Current Consumption ............................................................................. 264
Section 10 Clock Oscillation Circuits ........................................................................... 267
10.1 Overview........................................................................................................................... 267
10.1.1 Features................................................................................................................ 267
10.2 Overview of CPG.............................................................................................................. 269
10.2.1 Block Diagram of CPG........................................................................................ 269
10.2.2 CPG Pin Configuration ........................................................................................ 272
10.2.3 CPG Register Configuration ................................................................................ 272
10.3 Clock Operating Modes .................................................................................................... 273
10.4 CPG Register Description................................................................................................. 275
10.4.1 Frequency Control Register (FRQCR)................................................................. 275
10.5 Changing the Frequency ................................................................................................... 278
10.5.1 Changing PLL Circuit 1 Starting/Stopping (When PLL Circuit 2 Is Off) ........... 278
10.5.2 Changing PLL Circuit 1 Starting/Stopping (When PLL Circuit 2 Is On)............ 278
10.5.3 Changing Bus Clock Division Ratio (When PLL Circuit 2 Is On) ...................... 279
10.5.4 Changing Bus Clock Division Ratio (When PLL Circuit 2 Is Off) ..................... 279
10.5.5 Changing CPU or Peripheral Module Clock Division Ratio ............................... 279
10.6 Output Clock Control........................................................................................................ 280
10.7 Overview of Watchdog Timer .......................................................................................... 280
10.7.1 Block Diagram..................................................................................................... 280
10.7.2 Register Configuration......................................................................................... 281
10.8 WDT Register Descriptions .............................................................................................. 281
10.8.1 Watchdog Timer Counter (WTCNT)................................................................... 281
10.8.2 Watchdog Timer Control/Status Register (WTCSR)........................................... 282
10.8.3 Notes on Register Access..................................................................................... 284
10.9 Using the WDT ................................................................................................................. 285
10.9.1 Standby Clearing Procedure ................................................................................ 285
10.9.2 Frequency Changing Procedure ........................................................................... 285
10.9.3 Using Watchdog Timer Mode.............................................................................. 286
10.9.4 Using Interval Timer Mode ................................................................................. 286
10.10 Notes on Board Design ..................................................................................................... 287
10.11 Usage Notes ...................................................................................................................... 289
10.11.1 Invalid Manual Reset Triggered by Watchdog Timer (SH7751 Only)................ 289
Rev.4.00 Oct. 10, 2008 Page lxii of xcviii
REJ09B0370-0400