These bits determine the number of GCLK_WDT
               clocks in the offset from the start of the watchdog time-out period to when the Early
               Warning interrupt is generated. These bits are loaded from NVM User Row at start-up.
               Refer to NVM User Row Mapping for more details. 
         
         | Value | Description | 
|---|
               | 0x0 | 
               8 clock cycles | 
            
               | 0x1 | 
               16 clock cycles | 
            
               | 0x2 | 
               32 clock cycles | 
            
               | 0x3 | 
               64 clock cycles | 
            
               | 0x4 | 
               128 clock cycles | 
            
               | 0x5 | 
               256 clocks cycles | 
            
               | 0x6 | 
               512 clocks cycles | 
            
               | 0x7 | 
               1024 clock cycles | 
            
               | 0x8 | 
               2048 clock cycles | 
            
               | 0x9 | 
               4096 clock cycles | 
            
               | 0xA | 
               8192 clock cycles | 
            
               | 0xB | 
               16384 clock cycles | 
            
               | 0xC-0xF | 
               Reserved |