Watchdog Timer

Sometimes, the compiler vendor "normalizes" names of SFR. But the datasheet will contain the address of the SFR, so you can use this address and look through the Keil header and see if you find any other define that relates to your specific SFR.

In sequence not only means "first a, then b". In this specific situation it means. "first a, then nothing else, then b". You must not do any other write between these two writes for the chip to accept the activation. This is very common in microcontrollers and is intended to protect a crashed program from making spurious writes that may erase memory or similar. In the case of the watchdog, you do not want a crashed program to make spurious writes that results in watchdog kicks, thereby avoiding the saving watchdog reset.

Sometimes, the compiler vendor "normalizes" names of SFR. But the datasheet will contain the address of the SFR, so you can use this address and look through the Keil header and see if you find any other define that relates to your specific SFR.

In sequence not only means "first a, then b". In this specific situation it means. "first a, then nothing else, then b". You must not do any other write between these two writes for the chip to accept the activation. This is very common in microcontrollers and is intended to protect a crashed program from making spurious writes that may erase memory or similar. In the case of the watchdog, you do not want a crashed program to make spurious writes that results in watchdog kicks, thereby avoiding the saving watchdog reset.