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 that is configured to detect an event detection signal;
a timing circuit that is configured to generate the time-of-day data according to a signal outputted from an oscillator circuit;
a memory; and
a control circuit that is configured to record event data in the memory regardless of whether a reduction in an applied voltage has been detected, if the event detection circuit detects input of the event detection signal, whereinthe event data includes additional data indicating an operating state of the real time clock and the time-of-day data generated by the timing circuit, andthe control circuit uses the determination of whether the reduction in the applied voltage has been detected to then determine a correctness of the determination of whether the occurrence of the event has been detected.
0 Assignments
0 Petitions
Accused Products
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.
20 Citations
12 Claims
-
1. A real time clock for outputting data indicating a time-of-day, comprising:
-
an event detection circuit that is configured to detect an event detection signal; a timing circuit that is configured to generate the time-of-day data according to a signal outputted from an oscillator circuit; a memory; and a control circuit that is configured to record event data in the memory regardless of whether a reduction in an applied voltage has been detected, if the event detection circuit detects input of the event detection signal, wherein the event data includes additional data indicating an operating state of the real time clock and the time-of-day data generated by the timing circuit, and the control circuit uses the determination of whether the reduction in the applied voltage has been detected to then determine a correctness of the determination of whether the occurrence of the event has been detected. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
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:
-
determining whether a reduction in an applied voltage has been detected; determining whether the occurrence of the event has been detected;
using the determination of whether the reduction in the applied voltage has been detected to determine a correctness of the determination of whether the occurrence of the event has been detected; andrecording the data as event data, wherein the data includes 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. - View Dependent Claims (9, 10, 11)
-
-
12. A real time clock for outputting data indicating a time-of-day, comprising:
-
an event detection circuit that is configured to detect an event detection signal; a timing circuit that is configured to generate the time-of-day data according to a signal outputted from an oscillator circuit; a memory; and a control circuit that is configured to record event data in the memory if the event detection circuit detects input of the event detection signal, 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, wherein the control circuit uses a determination of whether a reduction in applied voltage has been detected to then determine a correctness of a determination of whether an occurrence of the event has been detected.
-
Specification