| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the precision of a real time clock by correcting the deviation of a period in which a temperature correcting operation is invalid due to the pause of a control part for controlling electronic equipment. SOLUTION: The measurement error of an RTC to be self-derived is integrated by a CPU 101 based on a temperature measured by a temperature sensor unit 109 and a passing time in a state that the operation of the CPU 101 is valid, and the measured present time and the present temperature are obtained, and compared with the past time and the past temperature stored in an SRAM 104, and temperature change while the operation is invalid is estimated, and the measurement error of the RTC 105 to be self-driven is integrated by the CPU 101 based on the estimated temperature change. Thus, the present time to be measured by the RTC 105 can be corrected based on each integrated measurement error.</p> |
