Clock calibration method, chip and electronic equipment

Abstract

The embodiment of the invention provides a clock calibration method, a chip and electronic equipment. The clock calibration method comprises the following steps: receiving one of an external clock andan internal clock as a working clock through a counting module, taking the other one of the external clock and the internal clock as a counted clock, and counting the counted clock; calculating the current clock frequency of the internal clock according to the counting number, measured by the counting module, of the signals output by the counted clock in multiple periods and the clock frequency of the external clock; and adjusting the clock frequency of the internal clock according to the current clock frequency and a preset expected clock frequency. By adopting the embodiment of the invention, automatic calibration of the internal clock is realized.

Description

technical field [0001] The present application relates to the field of computer technology, in particular to a clock calibration method, chip, and electronic equipment. Background technique [0002] At present, there are two types of working clocks used by single-chip microcomputer chips, including: one is the clock provided by an external oscillator, which is called an external clock, and the other is a clock provided by an internal oscillator, which is called an external clock. for the internal clock. [0003] The internal clock will be calibrated once before the chip leaves the factory, but the characteristics of the internal clock itself and the production process will cause the clock frequency of the internal clock to be easily shifted by changes in ambient temperature and voltage, and the clock frequency generated by the internal clock will vary to varying degrees. The jitter, that is, the frequency jump, the length of each cycle of the clock signal is different. Co...

AI Technical Summary

Problems solved by technology

[0003] The internal clock will be calibrated once before the chip leaves the factory, but the characteristics of the internal clock itself and the production process will cause the clock frequency of the internal clock to be easily shifted by changes in ambient temperature and voltage, and the clock frequency generated by the internal clock will vary to varying degrees. The jitter, that is, the frequency jump, the length of each cycle of the clock signal is different

Images