SH7261 datasheet(19/1348 Pages) RENESAS

19 / 1348 page

Rev. 2.00 Sep. 07, 2007 Page xix of xxxii

13.7

Interrupt Sources................................................................................................................ 619

13.7.1 Interrupt Sources................................................................................................... 619

13.7.2 A/D Converter Activation..................................................................................... 620

13.8

Usage Notes ....................................................................................................................... 620

13.8.1 Notes on Setting Cycle.......................................................................................... 620

13.8.2 Conflict between TCNT Write and Clear ............................................................. 620

13.8.3 Conflict between TCNT Write and Increment...................................................... 621

13.8.4 Conflict between TCOR Write and Compare Match ............................................ 621

13.8.5 Conflict between Compare Matches A and B....................................................... 622

13.8.6 Switching of Internal Clocks and TCNT Operation.............................................. 622

13.8.7 Mode Setting with Cascaded Connection ............................................................. 624

13.8.8 Module Standby Setting........................................................................................ 624

13.8.9 Interrupts in Module Standby Mode ..................................................................... 624

Section 14 Watchdog Timer (WDT)..................................................................625

14.1

Features.............................................................................................................................. 625

14.2

Input/Output Pin................................................................................................................. 626

14.3

Register Descriptions ......................................................................................................... 627

14.3.1 Watchdog Timer Counter (WTCNT).................................................................... 627

14.3.2 Watchdog Timer Control/Status Register (WTCSR)............................................ 628

14.3.3 Watchdog Reset Control/Status Register (WRCSR) ............................................ 630

14.3.4 Notes on Register Access...................................................................................... 631

14.4

WDT Usage .......................................................................................................................633

14.4.1 Canceling Software Standby Mode....................................................................... 633

14.4.2 Changing the Frequency ....................................................................................... 633

14.4.3 Using Watchdog Timer Mode .............................................................................. 634

14.4.4 Using Interval Timer Mode .................................................................................. 635

14.5

Usage Notes ....................................................................................................................... 636

14.5.1 Timer Variation..................................................................................................... 636

14.5.2 Prohibition against Setting H'FF to WTCNT........................................................ 636

14.5.3 System Reset by

WDTOVF Signal....................................................................... 636

14.5.4 Manual Reset in Watchdog Timer Mode .............................................................. 637

Section 15 Realtime Clock (RTC) .....................................................................639

15.1

Features.............................................................................................................................. 639

15.2

Input/Output Pin................................................................................................................. 641

15.3

Register Descriptions ......................................................................................................... 641

15.3.1 64-Hz Counter (R64CNT) .................................................................................... 642

15.3.2 Second Counter (RSECCNT) ............................................................................... 643

15.3.3 Minute Counter (RMINCNT) ............................................................................... 644

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