The level detector compares a first reference voltage with a supply voltage provided to the system, and provides output of a first reset signal indicating that the controller is in an abnormal state in dependence upon {HEAD ~ the comparison} between the first reference voltage and {TAIL ~ the supply voltage} 
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The level detector compares a first reference voltage with a supply voltage provided to the system , and provides output of a first reset signal indicating that the controller is in an abnormal state in dependence upon { HEAD ~ the comparison } between the first reference voltage and { TAIL ~ the supply voltage }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL