Calibration method of real-time clock

Abstract

The invention discloses a calibration method of a real-time clock, which comprises the following steps: (1) a default compensation parameter N is set, and time T of the clock used for the first time or the time T of the clock adjusted and set for the last time is recorded; (2) if the clock is adjusted and set, a time parameter of the clock during the adjustment and setting of the clock is recorded, and if not, the operation goes to step (4); (3) a corrected parameter is calculated according to the obtained time parameter in the step (2), and is used for correcting the N; and (4) the clock is timely adjusted according to the compensation parameter N. The method has the advantages that the relatively higher accuracy of the clock can be kept during the use of the clock in normal environment or certain special environment for long time; the times of adjusting the clock are reduced; the general application requirements are satisfied; the algorithm is simple; and the operation of calibration is easy to realize.

Description

technical field [0001] The invention relates to a real-time clock calibration method. Background technique [0002] In electronic products, many products have a real-time clock display function, so how to ensure the accuracy of the real-time clock display? Generally, there are two methods as follows. [0003] The first is to calibrate the time through communication, such as GPS and radio wave communication to calibrate the local time. This method is generally used in occasions that require very high clock accuracy, and the cost is very high. It is not suitable for general consumption or occasions that only require general clock accuracy. [0004] The second method is to use the local crystal oscillator as the clock source to display the real-time clock, and the crystal oscillator is used as the clock source. Generally, the crystal oscillator will be affected by some environmental factors such as temperature, humidity, and aging. As the use time becomes longer, It will be ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the defects of existing time calibration, the present invention provides a solution for real-time clock calibration