23.4.3 Watchdog Lock

PS_WDT_MR and NS_WDT_MR can be written until a LOCKMR command is issued in the corresponding PS_WDT_CR or NS_WDT_CR. Once locked, only a processor reset resets PS_WDT_MR and NS_WDT_MR. As long as a WDT is not locked, writing NS_WDT_MR or PS_WDT_MR automatically reloads the corresponding Watchdog timer with the newly programmed mode parameters.

If the watchdog is restarted by writing into the corresponding Control register (PS_WDT_CR or NS_WDT_CR), the corresponding PS_WDT_MR or NS_WDT_MR must not be programmed during a period of time of three MD_SLCK periods following the PS_WDT_CR or NS_WDT_CR write access.