SH7265 Datasheet, PDF (19/2024 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

13.3.1 Interval Count Operation .................................................................................. 679
13.3.2 CMCNT Count Timing..................................................................................... 679
13.4 Interrupts........................................................................................................................... 680
13.4.1 Interrupt Sources and DMA Transfer Requests ................................................ 680
13.4.2 Timing of Compare Match Flag Setting ........................................................... 680
13.4.3 Timing of Compare Match Flag Clearing......................................................... 681
13.5 Usage Notes ...................................................................................................................... 682
13.5.1 Conflict between Write and Compare-Match Processes of CMCNT ............... 682
13.5.2 Conflict between Word-Write and Count-Up Processes of CMCNT ............... 683
13.5.3 Conflict between Byte-Write and Count-Up Processes of CMCNT................. 684
Section 14 Watchdog Timer (WDT)..................................................................685
14.1 Features............................................................................................................................. 685
14.2 Input/Output Pin ............................................................................................................... 687
14.3 Register Descriptions........................................................................................................ 688
14.3.1 Watchdog Timer Counter (WTCNT0, WTCNT1)............................................ 688
14.3.2 Watchdog Timer Control/Status Register (WTCSR0, WTCSR1) .................... 689
14.3.3 Watchdog Reset Control/Status Register (WRCSR0, WRCSR1)..................... 691
14.3.4 Notes on Register Access.................................................................................. 693
14.4 WDT Usage ...................................................................................................................... 695
14.4.1 Canceling Software Standby Mode................................................................... 695
14.4.2 Changing the PLL Multiplication Ratio............................................................ 695
14.4.3 Using Watchdog Timer Mode........................................................................... 695
14.4.4 Using Interval Timer Mode .............................................................................. 697
14.5 Usage Notes ...................................................................................................................... 698
14.5.1 Timer Variation................................................................................................. 698
14.5.2 Prohibition against Setting H'FF to WTCNT.................................................... 698
14.5.3 Interval Timer Overflow Flag ........................................................................... 698
14.5.4 System Reset by WDTOVF Signal................................................................... 698
14.5.5 Manual Reset in Watchdog Timer Mode .......................................................... 699
14.5.6 Transition to Deep Standby Mode .................................................................... 699
Section 15 Realtime Clock (RTC) .....................................................................701
15.1 Features............................................................................................................................. 701
15.2 Input/Output Pin ............................................................................................................... 703
15.3 Register Descriptions........................................................................................................ 704
15.3.1 64-Hz Counter (R64CNT) ................................................................................ 705
15.3.2 Second Counter (RSECCNT) ........................................................................... 706
15.3.3 Minute Counter (RMINCNT) ........................................................................... 707
15.3.4 Hour Counter (RHRCNT)................................................................................. 708
Rev. 1.00 Mar. 14, 2008 Page xix of xxxvi