130CHAPTER 6 WATCHDOG TIMER6.3 Watchdog Control Register (WDTC)The watchdog control register (WDTC) activates and clears the watchdog timer.■ Watchdog Control Register (WDTC)Figure 6.3-1 Watchdog Control Register (WDTC)WTE3 WTE2 WTE1 WTE00 1 0 1RESV0bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit00009 H RESV WTE3 WTE2 WTE1 WTE0 0---XXXX BR/W R/W R/W R/W R/WAddress Initial valueWatchdog control bitStarts the watchdog timer(upon first writing after reset)Clears the watchdog timer(upon second or subsequent writing after areset)Other than above No operationReserved bitWrite "0" to this bit.: UnusedR/W : Readable/writableX : UndefinedTable 6.3-1 Explanation of Functions of Each Bit in Watchdog Control Register (WDTC)Bit name Descriptionbit7 RESV: Reserved bit • Write "0" to this bit.bit6tobit4Unused bits • Undefined when it is read.• Writing values does not affect operation.bit3tobit0WTE3, WTE2,WTE1, WTE0:Watchdog control bits• Writing "0101 B " activates (for first writing) or clears (for secondor subsequent writing) the watchdog timer.• Writing other than "0101 B " does not affect operation.Note:These bits indicate "1111 B " when read. Bit manipulationinstructions cannot be used.
