SLOW-CLOCK CALIBRATION METHOD AND UNIT, CLOCK CIRCUIT, AND MOBILE COMMUNICATION TERMINAL

摘要

A slow-clock calibration method, a slow-clock calibration unit, a clock circuit and a mobile communication terminal are provided. The calibration method includes: obtaining a current temperature of the crystal; searching a unique frequency-divide coefficient corresponding to the current temperature from a preset data base; if the coefficient is found in the data base, inputting the unique coefficient into a frequency divider; if the coefficient is not found in the data base, obtaining an actual sleep length of the mobile communication terminal, if the actual sleep length is not equal to a required sleep length, calculating a required frequency-divide coefficient and updating the data base with the required frequency-divide coefficient, and if the actual sleep length of the mobile communication terminal is equal to the required sleep length, updating the data base with a current frequency-divide coefficient. Accordingly, slow-clock calibration is realized with reduced crystal costs.

主权项

1. A slow-clock calibration method for a clock circuit of a mobile communication terminal, where the clock circuit comprises a crystal, an oscillating circuit and a frequency divider, comprising:
obtaining a current temperature of the crystal; searching, by taking a value of the current temperature as an index value, a preset data base for a unique frequency-divide coefficient corresponding to the current temperature of the crystal; if the unique frequency-divide coefficient corresponding to the current temperature of the crystal is found in the data base, inputting the unique frequency-divide coefficient into the frequency divider; and if the unique frequency-divide coefficient corresponding to the current temperature of the crystal is not found in the data base, obtaining an actual sleep length of the mobile communication terminal when the mobile communication terminal is awake and in synchronization with a base station, if the actual sleep length of the mobile communication terminal is not equal to a required sleep length, calculating a required frequency-divide coefficient of the frequency divider under the current temperature and updating the data base with the required frequency-divide coefficient, and if the actual sleep length of the mobile communication terminal is equal to the required sleep length, updating the data base with a current frequency-divide coefficient used by the frequency divider.