Forum Post: RE: TMS320F280039C: No watchdog reset if no delay applied between config and activation

Hi Nicolas, The issue is related to the registers having limitation where there is clock domain crossing from SYSCLK to INTOSC1. Optimization will affect how register writes are placed, hence you see the difference in the behavior. [quote userid="626407" url="~/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1423295/tms320f280039c-no-watchdog-reset-if-no-delay-applied-between-config-and-activation/5469424#5469424"]What I don't understand is that the function SysCtl_setWatchdogMode will write the SCSR register that are not in this list. If I comment the line to configure the watchdog mode it's ok. Does the register SCSR must be in the table 3.15?[/quote] No, SCSR is not in the list of the registers in INTOSC1 domain. I would recommend that you use the latest c2000ware where we have added the delays after each register write that has this limitation in the driverlib function itself. Example: Thanks.