SH7205 datasheet(19/1904 Pages) RENESAS

19 / 1904 page

Rev. 1.00 Mar. 25, 2008 Page xix of xxxii

13.5.2 Conflict between Word-Write and Count-Up Processes of CMCNT ................... 681

13.5.3 Conflict between Byte-Write and Count-Up Processes of CMCNT..................... 682

Section 14 Watchdog Timer (WDT)..................................................................683

14.1

Features.............................................................................................................................. 683

14.2

Input/Output Pin................................................................................................................. 685

14.3

Register Descriptions ......................................................................................................... 686

14.3.1 Watchdog Timer Counter (WTCNT0, WTCNT1)................................................ 686

14.3.2 Watchdog Timer Control/Status Register (WTCSR0, WTCSR1) ........................ 687

14.3.3 Watchdog Reset Control/Status Register (WRCSR0, WRCSR1)......................... 689

14.3.4 Notes on Register Access...................................................................................... 691

14.4

WDT Usage .......................................................................................................................693

14.4.1 Canceling Software Standby Mode....................................................................... 693

14.4.2 Changing the PLL Multiplication Ratio................................................................ 693

14.4.3 Using Watchdog Timer Mode .............................................................................. 693

14.4.4 Using Interval Timer Mode .................................................................................. 695

14.5

Usage Notes ....................................................................................................................... 696

14.5.1 Timer Variation..................................................................................................... 696

14.5.2 Prohibition against Setting H'FF to WTCNT........................................................ 696

14.5.3 Interval Timer Overflow Flag ............................................................................... 696

14.5.4 System Reset by

WDTOVF Signal....................................................................... 696

14.5.5 Manual Reset in Watchdog Timer Mode .............................................................. 697

14.5.6 Transition to Deep Standby Mode ........................................................................ 697

Section 15 Realtime Clock (RTC) .....................................................................699

15.1

Features.............................................................................................................................. 699

15.2

Input/Output Pin................................................................................................................. 701

15.3

Register Descriptions ......................................................................................................... 702

15.3.1 64-Hz Counter (R64CNT) .................................................................................... 703

15.3.2 Second Counter (RSECCNT) ............................................................................... 704

15.3.3 Minute Counter (RMINCNT) ............................................................................... 705

15.3.4 Hour Counter (RHRCNT)..................................................................................... 706

15.3.5 Day of Week Counter (RWKCNT) ...................................................................... 707

15.3.6 Date Counter (RDAYCNT) .................................................................................. 708

15.3.7 Month Counter (RMONCNT) .............................................................................. 709

15.3.8 Year Counter (RYRCNT) ..................................................................................... 710

15.3.9 Second Alarm Register (RSECAR) ...................................................................... 711

15.3.10 Minute Alarm Register (RMINAR) ...................................................................... 712

15.3.11 Hour Alarm Register (RHRAR) ........................................................................... 713

15.3.12 Day of Week Alarm Register (RWKAR) ............................................................. 714

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