R5F72115D160FPV datasheet(17/1228 Pages) RENESAS

17 / 1228 page

Rev. 2.00 May. 08, 2008 Page xvii of xxiv

REJ09B0344-0200

12.5

Interrupts ............................................................................................................................ 634

12.6

Usage Note......................................................................................................................... 635

12.6.1 Pin Status When the WDT Issues a Power-On Reset ........................................... 635

Section 13 Compare Match Timer (CMT)...........................................................637

13.1

Features .............................................................................................................................. 637

13.2

Register Descriptions ......................................................................................................... 638

13.2.1 Compare Match Timer Start Register (CMSTR) .................................................. 639

13.2.2 Compare Match Timer Control/Status Register (CMCSR) .................................. 640

13.2.3 Compare Match Counter (CMCNT) ..................................................................... 642

13.2.4 Compare Match Constant Register (CMCOR) ..................................................... 642

13.3

Operation ........................................................................................................................... 643

13.3.1 Interval Count Operation ...................................................................................... 643

13.3.2 CMCNT Count Timing......................................................................................... 643

13.4

Interrupts ............................................................................................................................ 644

13.4.1 Interrupt Sources and DMA Transfer Requests .................................................... 644

13.4.2 Timing of Compare Match Flag Setting ............................................................... 644

13.4.3 Timing of Compare Match Flag Clearing............................................................. 645

13.5

Usage Notes ....................................................................................................................... 646

13.5.1 Conflict between Write and Compare-Match Processes of CMCNT ................... 646

13.5.2 Conflict between Word-Write and Count-Up Processes of CMCNT ................... 647

13.5.3 Conflict between Byte-Write and Count-Up Processes of CMCNT..................... 648

13.5.4 Compare Match Between CMCNT and CMCOR................................................. 648

Section 14 Watchdog Timer (WDT)....................................................................649

14.1

Features .............................................................................................................................. 649

14.2

Input/Output Pin................................................................................................................. 651

14.3

Register Descriptions ......................................................................................................... 652

14.3.1 Watchdog Timer Counter (WTCNT).................................................................... 652

14.3.2 Watchdog Timer Control/Status Register (WTCSR)............................................ 653

14.3.3 Watchdog Reset Control/Status Register (WRCSR) ............................................ 655

14.3.4 Notes on Register Access...................................................................................... 656

14.4

WDT Usage ....................................................................................................................... 658

14.4.1 Canceling Software Standby Mode....................................................................... 658

14.4.2 Changing the Frequency ....................................................................................... 659

14.4.3 Using Watchdog Timer Mode............................................................................... 660

14.4.4 Using Interval Timer Mode .................................................................................. 662

14.5

Usage Notes ....................................................................................................................... 663

14.5.1 Timer Variation..................................................................................................... 663

14.5.2 Prohibition against Setting H'FF to WTCNT........................................................ 663

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