Renesas RX Series

29.2.6 Low-Power Timer Standby Wakeup Enable Register (LPWUCR) ......................................... 815
29.3 Operation ........................................................................................................................................... 816
29.3.1 Periodic Counting Operation .................................................................................................... 816
29.3.2 Count Timing of Low-Power Timer Counter ........................................................................... 818
29.3.3 Clearing Timing of Low-Power Timer Counter ....................................................................... 818
29.4 Wakeup from Software Standby Mode by an Interrupt through the Event Link Controller (ELC) .. 819
29.5 Usage Notes ....................................................................................................................................... 819
29.5.1 Notes on Transition to Software Standby Mode ...................................................................... 819
30. Watchdog Timer (WDTA) ............................................................................................................. 820
30.1 Overview ........................................................................................................................................... 820
30.2 Register Descriptions ......................................................................................................................... 821
30.2.1 WDT Refresh Register (WDTRR) ........................................................................................... 821
30.2.2 WDT Control Register (WDTCR) ........................................................................................... 822
30.2.3 WDT Status Register (WDTSR) .............................................................................................. 825
30.2.4 WDT Reset Control Register (WDTRCR) ............................................................................... 826
30.2.5 Option Function Select Register 0 (OFS0) ............................................................................... 826
30.3 Operation ........................................................................................................................................... 827
30.3.1 Count Operation in Each Start Mode ....................................................................................... 827
30.3.1.1 Register Start Mode ......................................................................................................... 827
30.3.1.2 Auto-Start Mode .............................................................................................................. 829
30.3.2 Control over Writing to the WDTCR and WDTRCR Registers .............................................. 831
30.3.3 Refresh Operation ..................................................................................................................... 831
30.3.4 Reset Output ............................................................................................................................. 832
30.3.5 Interrupt Source ........................................................................................................................ 832
30.3.6 Reading the Down-Counter Value ........................................................................................... 833
30.3.7 Correspondence between Option Function Select Register 0 (OFS0) and WDT Registers ..... 833
31. Independent Watchdog Timer (IWDTa) ........................................................................................ 834
31.1 Overview ........................................................................................................................................... 834
31.2 Register Descriptions ......................................................................................................................... 836
31.2.1 IWDT Refresh Register (IWDTRR) ......................................................................................... 836
31.2.2 IWDT Control Register (IWDTCR) ......................................................................................... 837
31.2.3 IWDT Status Register (IWDTSR)
............................................................................................ 840
31.2.4 IWDT Reset Control Register (IWDTRCR) ............................................................................ 841
31.2.5 IWDT Count Stop Control Register (IWDTCSTPR) ............................................................... 842
31.2.6 Option Function Select Register 0 (OFS0) ............................................................................... 842
31.3 Operation ........................................................................................................................................... 843
31.3.1 Count Operation in Each Start Mode ....................................................................................... 843
31.3.1.1 Register Start Mode ......................................................................................................... 843
31.3.1.2 Auto-Start Mode .............................................................................................................. 845
31.3.2 Control over Writing to the IWDTCR, IWDTRCR, and IWDTCSTPR Registers .................. 847
31.3.3 Refresh Operation ..................................................................................................................... 848