Time measurement device, micro-controller and method of measuring time

Patent metadata

Field	Value
Publication number	US-9134752-B2
Application number	US-201213687121-A
Country	US
Kind code	B2
Filing date	Nov 28, 2012
Priority date	Dec 1, 2011
Publication date	Sep 15, 2015
Grant date	Sep 15, 2015

Abstract

A time measurement device includes a first measurement unit configured to measure a clock number of a first reference clock signal within a specific cycle of a second reference clock signal; a calculation unit configured to calculate a physical amount indicating a variance amount of the clock number relative to a reference clock number; a compensation unit configured to compensate an expected measurement value indicating the clock number of the first reference clock signal corresponding to a time as a measurement target according to the physical amount calculated with the calculation unit; and an output unit configured to output time information indicating that the clock number of the first reference clock signal reaches the expected measurement value when the clock number of the first reference clock signal measured with the first measurement unit reaches the expected measurement value compensated with the compensation unit.

First claim

What is claimed is:

1. A time measurement device comprising:
a first measurement unit configured to measure a clock period of a first reference clock signal within a specific cycle of a second reference clock signal, said second reference clock signal having an oscillation frequency lower than that of the first reference clock signal and oscillation accuracy higher than that of the first reference clock signal;
a calculation unit configured to calculate a physical amount indicat…

Assignees

• Lapis Semiconductor Co Ltd

Inventors

• Yasuda Kosuke

Classifications

• G06F1/14 Primary

  Physics · mapped topic

• G06F1/04

  Physics · mapped topic