Device for detecting a plurality of signal levels indicating stopping of a clock signal
First Claim
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1. A device for detecting a plurality of signal levels indicating stopping of a clock signal in a semiconductor device having a clock signal oscillator, the device comprising:
- a voltage detecting circuit for outputting a clock voltage detection signal when a clock signal output from a clock signal oscillator remains at a high level, when the clock signal remains at a low level, and when the clock signal remains at an intermediate level; and
an oscillation-stop detecting circuit for outputting a stop detection signal, indicating stopping of the clock signal, in response to the clock voltage detection signal.
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Abstract
The oscillation-stop detecting device accurately detects the stopping of a clock signal due to various causes. The voltage detecting circuit detects when a clock signal output from the clock signal oscillator remains at a high, a low or an intermediate level, and outputs a clock voltage detection signal. The oscillation-stop detecting circuit outputs a detection signal in response to the voltage detection signal.
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13 Claims
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1. A device for detecting a plurality of signal levels indicating stopping of a clock signal in a semiconductor device having a clock signal oscillator, the device comprising:
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a voltage detecting circuit for outputting a clock voltage detection signal when a clock signal output from a clock signal oscillator remains at a high level, when the clock signal remains at a low level, and when the clock signal remains at an intermediate level; and an oscillation-stop detecting circuit for outputting a stop detection signal, indicating stopping of the clock signal, in response to the clock voltage detection signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification