# US 12,181,914 B2 · Real-time clock module

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- Number: US 12,181,914 B2
- Document ID: US12181914B2
- Status: Granted
- Kind: B2
- Application number: 18/306,274
- Filed: 2023-04-25
- Published: 2023-10-26
- Granted: 2024-12-31
- Earliest claimed: 2022-04-26
- Assignees: Seiko Epson Corporation
- Applicants: Seiko Epson Corporation
- Inventors: Yasuhiro Sudo
- Web page: https://patentgrep.com/patent/US12181914B2

## CPC

- G06F 1/14: Time supervision arrangements, e.g. real time clock
- G06F 1/10: Distribution of clock signals {, e.g. skew}
- G06F 1/30: Means for acting in the event of power-supply failure or interruption, e.g. power-supply fluctuations (for resetting only G06F1/24)
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

A real-time clock module includes: a timing circuit configured to measure a time to generate time data; a selection circuit configured to select at least one of a plurality of types of event data as target event data to be stored and select, as target time data to be stored, data corresponding to at least a part of time digits of the time data in response to generation of an event; and a memory circuit configured to store the target time data and the target event data.

## Claims

### Claim 1

A real-time clock module comprising:
a timing circuit configured to measure a time to generate time data;
a selection circuit configured to select at least one of a plurality of types of event data as target event data to be stored and select, as target time data to be stored, data corresponding to at least a part of time digits of the time data in response to generation of an event; and
a memory circuit configured to store the target time data and the target event data.

### Claim 2 (depends on 1)

The real-time clock module according to claim 1, wherein
the selection circuit includes
a nonvolatile memory configured to store a command set specifying the target event data, and
a processor configured to select the target event data based on the command set.

### Claim 3 (depends on 1)

The real-time clock module according to claim 1, wherein
the selection circuit is configured to acquire the target time data and cause the memory circuit to store the target time data after a next time update timing arrives after the event generates.

### Claim 4 (depends on 1)

The real-time clock module according to claim 1, further comprising:
a power supply voltage monitoring circuit configured to monitor a power supply voltage and generate power supply voltage monitoring data, wherein
the plurality of types of event data include the power supply voltage monitoring data.

### Claim 5 (depends on 1)

The real-time clock module according to claim 1, wherein
the event is generated by an external input signal received from an outside of the real-time clock module, and
the plurality of types of event data include data corresponding to the external input signal.

### Claim 6 (depends on 1)

The real-time clock module according to claim 1, wherein
the plurality of types of event data include sensor data based on data detected by an external sensor device.

### Claim 7 (depends on 6)

The real-time clock module according to claim 6, wherein
the sensor device is a temperature sensor, and
the sensor data includes temperature data.

### Claim 8 (depends on 6)

The real-time clock module according to claim 6, wherein
the sensor device is a position information sensor, and
the sensor data includes position data.

### Claim 9 (depends on 6)

The real-time clock module according to claim 6, wherein
the sensor device is an inertial sensor, and
the sensor data includes inertial data.

### Claim 10 (depends on 1)

The real-time clock module according claim 1, further comprising:
a resonator; and
an oscillation circuit configured to generate a clock signal by oscillating the resonator, wherein
the timing circuit is configured to measure the time based on the clock signal.