SH7211 Datasheet, PDF (17/1228 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family

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
Rev. 2.00 May. 08, 2008 Page xvii of xxiv
REJ09B0344-0200