Patent ID: 9606007
Date: 2017-03-28
CPC Classifications: G01K,G01R

Claim:
1. A semiconductor device comprising: a first counter that performs a count operation based on a signal of a first frequency; a second counter that performs a count operation based on a signal of a second frequency; and a control section that determines a higher frequency out of the first frequency or the second frequency based on a count value of the first counter and a count value of the second counter, measures the other frequency and computes a frequency ratio by using the higher frequency as a reference, and acquires a measurement value by referring to a specific table expressing correspondence relationships between the frequency ratio and the measurement values, wherein the specific table includes a first region stored with ratios of the second frequency with respect to the first frequency, and a second region stored with ratios of the first frequency with respect to the second frequency, and frequency ratios are stored in the first region for cases in which the first frequency is lower than a value of a sum of the second frequency plus a specific permissible value, and frequency ratios are stored in the second region for cases in which the first frequency is greater than a value of the second frequency from which a specific permissible value has been subtracted.