SH7670 datasheet(14/1292 Pages) RENESAS

14 / 1292 page

Rev. 1.00 Nov. 14, 2007 Page xiv of xxvi

9.5.1

Changing the Multiplication Rate ..................................................................... 357

9.5.2

Changing the Division Ratio............................................................................. 358

9.6

Notes on Board Design ..................................................................................................... 359

9.6.1

Note on Inputting External Clock ..................................................................... 359

9.6.2

Note on Using an External Crystal Resonator .................................................. 359

9.6.3

Note on Resonator ............................................................................................ 360

9.6.4

Note on Using a PLL Oscillation Circuit.......................................................... 360

Section 10 Watchdog Timer (WDT) ................................................................. 361

10.1

Features............................................................................................................................. 361

10.2

Input/Output Pin ............................................................................................................... 362

10.3

Register Descriptions........................................................................................................ 363

10.3.1

Watchdog Timer Counter (WTCNT)................................................................ 363

10.3.2

Watchdog Timer Control/Status Register (WTCSR)........................................ 364

10.3.3

Watchdog Reset Control/Status Register (WRCSR) ........................................ 366

10.3.4

Notes on Register Access ................................................................................. 367

10.4

WDT Usage ...................................................................................................................... 369

10.4.1

Canceling Software Standby Mode .................................................................. 369

10.4.2

Changing the Frequency ................................................................................... 369

10.4.3

Using Watchdog Timer Mode .......................................................................... 370

10.4.4

Using Interval Timer Mode .............................................................................. 372

10.5

Usage Notes ...................................................................................................................... 373

10.5.1

Timer Variation ................................................................................................ 373

10.5.2

Prohibition against Setting H'FF to WTCNT.................................................... 373

10.5.3

System Reset by

WDTOVF Signal................................................................... 373

10.5.4

Manual Reset in Watchdog Timer Mode.......................................................... 374

Section 11 Power-Down Modes ........................................................................ 375

11.1

Features............................................................................................................................. 375

11.1.1

Power-Down Modes ......................................................................................... 375

11.2

Register Descriptions........................................................................................................ 376

11.2.1

Standby Control Register (STBCR).................................................................. 377

11.2.2

Standby Control Register 2 (STBCR2)............................................................. 378

11.2.3

Standby Control Register 3 (STBCR3)............................................................. 380

11.2.4

Standby Control Register 4 (STBCR4)............................................................. 382

11.2.5

System Control Register 1 (SYSCR1) .............................................................. 384

11.2.6

System Control Register 2 (SYSCR2) .............................................................. 386

11.2.7

System Control Register 3 (SYSCR3) .............................................................. 388

11.3

Operation .......................................................................................................................... 389

11.3.1

Sleep Mode ....................................................................................................... 389

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