1. A system that includes circuitry, comprising: a power supervisor coupled to a power supply voltage, wherein the power supervisor includes: a memory configured to store instructions for asserting a reset output signal to reset the circuitry in response to a reset comparison between a reference voltage and a programmable threshold voltage; a programmable voltage divider configured to provide the programmable threshold voltage as a voltage divided output in response to instructions from the memory; and a programmable reset time module configured to control a time characteristic of the reset output signal.