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Protective apparatus of vehicle microcomputer

  • US 4,951,210 A
  • Filed: 08/30/1988
  • Issued: 08/21/1990
  • Est. Priority Date: 08/31/1987
  • Status: Expired due to Fees
First Claim
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1. Protective apparatus of a vehicle microcomputer, comprising:

  • a microcomputer, connected to vehicle input and output devices, for controlling output devices in accordance with a program;

    a regulator for receiving an oscillating signal output from said microcomputer, said regulator inverting a reset signal therefrom when a period of the oscillating signal becomes longer than a predetermined period;

    a monostable circuit triggered to a metastable state upon inversion of the reset signal from said regulator, said monostable circuit being kept in the metastable state for a predetermined period of time; and

    an output inhibiting logic circuit for constraining output from said microcomputer to a predetermined output state in response to an output signal from said monostable circuit in the metastable state.

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