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Power up/power down controller and power fail detector for processor

  • US 5,283,792 A
  • Filed: 10/19/1990
  • Issued: 02/01/1994
  • Est. Priority Date: 10/19/1990
  • Status: Expired due to Term
First Claim
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1. A power fail controller for detecting early failure of a power supply for providing power to a system having a processor and a volatile memory, comprising:

  • an early power fail detection circuit for detecting a potential power supply failure in the power supply and generating a power fail signal for output to the processor;

    an out of tolerance detection circuit for detecting when the power supply is out of tolerance in accordance with predetermined tolerance parameters and generating an out of tolerance signal for output to the processor;

    a non-volatile memory accessible by the processor for storage of information therein, said information including executable instructions that are directly executable by the processor; and

    an inhibit circuit for inhibiting the processor from accessing said non-volatile memory when said out of tolerance signal is generated.

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