SH7727 Datasheet, PDF (38/1109 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7700 Series

Section 10 On-Chip Oscillation Circuits ...................................................................... 257
10.1 Overview........................................................................................................................... 257
10.1.1 Features................................................................................................................ 257
10.2 Overview of the CPG........................................................................................................ 259
10.2.1 CPG Block Diagram ............................................................................................ 259
10.2.2 CPG Pin Configuration ........................................................................................ 261
10.2.3 CPG Register Configuration ................................................................................ 261
10.3 Clock Operating Modes .................................................................................................... 262
10.4 Register Descriptions ........................................................................................................ 267
10.4.1 Frequency Control Register (FRQCR)................................................................. 267
10.4.2 CKIO2 Control Register (CKIO2CR).................................................................. 269
10.5 Changing the Frequency ................................................................................................... 270
10.5.1 Changing the Multiplication Rate ........................................................................ 270
10.5.2 Changing the Division Ratio................................................................................ 270
10.6 Overview of the WDT....................................................................................................... 271
10.6.1 Block Diagram of the WDT................................................................................. 271
10.6.2 Register Configurations ....................................................................................... 272
10.7 WDT Registers.................................................................................................................. 272
10.7.1 Watchdog Timer Counter (WTCNT)................................................................... 272
10.7.2 Watchdog Timer Control/Status Register (WTCSR)........................................... 273
10.7.3 Notes on Register Access..................................................................................... 275
10.8 Using the WDT ................................................................................................................. 275
10.8.1 Canceling Standby Mode ..................................................................................... 275
10.8.2 Changing the Frequency ...................................................................................... 276
10.8.3 Using Watchdog Timer Mode.............................................................................. 276
10.8.4 Using Interval Timer Mode.................................................................................. 277
10.9 Notes on Board Design ..................................................................................................... 277
Section 11 Extend Clock Pulse Generator for USB (EXCPG) .............................. 279
11.1 Overview........................................................................................................................... 279
11.1.1 EXCPG ................................................................................................................ 279
11.2 Functions........................................................................................................................... 279
11.2.1 Block Diagram ..................................................................................................... 279
11.2.2 Pin Configuration................................................................................................. 280
11.2.3 Register Configuration......................................................................................... 280
11.3 Register Descriptions ........................................................................................................ 280
11.3.1 EXCPG Control Register (EXCPGCR) ............................................................... 280
11.4 Usage Notes ...................................................................................................................... 281
Rev. 5.00 Dec 12, 2005 page xxxviii of lxxii