SH7721 datasheet(17/1524 Pages) RENESAS

17 / 1524 page

Rev. 3.00 Jan. 18, 2008 Page xvii of lxii

Section 11 Clock Pulse Generator (CPG)............................................................453

11.1

Features.............................................................................................................................. 453

11.2

Input/Output Pins ...............................................................................................................457

11.3

Clock Operating Modes ..................................................................................................... 458

11.4

Register Descriptions ......................................................................................................... 461

11.4.1 Frequency Control Register (FRQCR) ................................................................. 461

11.4.2 USBH/USBF Clock Control Register (UCLKCR) ............................................... 464

11.5

Changing Frequency .......................................................................................................... 465

11.5.1 Changing Multiplication Rate............................................................................... 465

11.5.2 Changing Division Ratio....................................................................................... 465

11.6

Usage Notes ....................................................................................................................... 466

11.7

Notes on Board Design ...................................................................................................... 466

Section 12 Watchdog Timer (WDT)....................................................................469

12.1

Features.............................................................................................................................. 469

12.2

Register Descriptions for WDT ......................................................................................... 471

12.2.1 Watchdog Timer Counter (WTCNT).................................................................... 471

12.2.2 Watchdog Timer Control/Status Register (WTCSR)............................................ 471

12.2.3 Notes on Register Access...................................................................................... 473

12.3

WDT Operation ................................................................................................................. 474

12.3.1 Canceling Software Standbys ............................................................................... 474

12.3.2 Changing Frequency ............................................................................................. 475

12.3.3 Using Watchdog Timer Mode .............................................................................. 475

12.3.4 Using Interval Timer Mode .................................................................................. 476

Section 13 Power-Down Modes ..........................................................................477

13.1

Features.............................................................................................................................. 477

13.1.1 Power-Down Modes ............................................................................................. 477

13.1.2 Reset ..................................................................................................................... 478

13.2

Input/Output Pins ...............................................................................................................479

13.3

Register Descriptions ......................................................................................................... 480

13.3.1 Standby Control Register (STBCR)...................................................................... 480

13.3.2 Standby Control Register 2 (STBCR2)................................................................. 481

13.3.3 Standby Control Register 3 (STBCR3)................................................................. 483

13.3.4 Standby Control Register 4 (STBCR4)................................................................. 484

13.3.5 Standby Control Register 5 (STBCR5)................................................................. 486

13.4

Sleep Mode ........................................................................................................................ 488

13.4.1 Transition to Sleep Mode...................................................................................... 488

13.4.2 Canceling Sleep Mode .......................................................................................... 488

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