REAL TIME CLOCK AND METHOD FOR RECORDING DATA IN REAL TIME CLOCK
First Claim
Patent Images
1. A real time clock for outputting data indicating a time-of-day, comprising:
- an event detection circuit for detecting that an event detection signal has been inputted from outside;
a timing circuit for generating the time-of-day data according to a signal outputted from an oscillator circuit;
a memory; and
a control circuit for, if the event detection circuit detects input of the event detection signal, recording event data in the memory regardless of whether a reduction in an applied voltage has been detected, the event data including additional data indicating an operating state of the real time clock and the time-of-day data generated by the timing circuit.
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Abstract
A real time clock for outputting data indicating a time of day includes: an event detection circuit for detecting that an event detection signal has been inputted from outside; a timing circuit for generating the time-of-day data according to a signal outputted from an oscillator circuit; a memory; and a control circuit for, if the event detection circuit detects input of the event detection signal, recording event data in the memory, the event data including additional data indicating an operating state of the real time clock and the time-of-day data generated by the timing circuit.
17 Citations
12 Claims
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1. A real time clock for outputting data indicating a time-of-day, comprising:
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an event detection circuit for detecting that an event detection signal has been inputted from outside; a timing circuit for generating the time-of-day data according to a signal outputted from an oscillator circuit; a memory; and a control circuit for, if the event detection circuit detects input of the event detection signal, recording event data in the memory regardless of whether a reduction in an applied voltage has been detected, the event data including additional data indicating an operating state of the real time clock and the time-of-day data generated by the timing circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for recording data in a real time clock having a function of recording data indicating a time of day of occurrence of an event in a memory, the method comprising
recording, as event data, data including the time-of-day data and additional data, the additional data including a determination about an operating state of the real time clock at the time of occurrence of the event.
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12. A real time clock for outputting data indicating a time-of-day, comprising:
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an event detection circuit for detecting that an event detection signal has been inputted from outside; a timing circuit for generating the time-of-day data according to a signal outputted from an oscillator circuit; a memory; and a control circuit for, if the event detection circuit detects input of the event detection signal, recording event data in the memory regardless of whether no reduction in an applied voltage has been detected, the event data including additional data indicating an operating state of the real time clock and the time-of-day data generated by the timing circuit.
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Specification