Charge Pump Threshold

The Charge Pump Threshold (CPT) bit indicates whether or not VDD is at an acceptable operating level. Charge pump hardware compares VDD to the threshold voltage (VAUTO), which is set at 4.6V. If VDD is above VAUTO, the CPT bit is set (CPT = 1). If VDD is below VAUTO, CPT is clear (CPT = 0).