# Independent Clock Source

The WWDT can derive its time base from either the 31 KHz LFINTOSC or 31.25 kHz MFINTOSC internal oscillators, depending on the value of WDT Operating Mode (WDTE) Configuration bits. If WDTE = ‘b1x, then the clock source will be enabled depending on the WDTCCS Configuration bits. If WDTE = ‘b01, the SEN bit will be set by software to enable WWDT, and the clock source is enabled by the CS bits. Time intervals in this chapter are based on a minimum nominal interval of 1 ms. See the device Electrical Specifications for LFINTOSC and MFINTOSC tolerances.