Calibration method and device for single-chip system clock, air-conditioning control system

Abstract

The invention discloses a method for calibrating a system clock of a single-chip microcomputer. The method comprises the following steps: the single-chip microcomputer to be calibrated receives a pulse signal of a preset time t1 and a preset period T sent by the single-chip microcomputer to be calibrated; a reference clock is provided in the single-chip microcomputer to be calibrated; The single-chip microcomputer counts the pulse number L1 of the pulse signal within the preset time t1; the calibrated single-chip microcomputer calibrates the internal clock of the calibrated single-chip microcomputer according to the counted pulse number L1 and the actual pulse number L2 sent by the calibration single-chip microcomputer within the preset time . The invention also discloses a calibration device for a system clock of a single-chip microcomputer and an air-conditioning control system. The invention solves the problem that the clocks of the single-chip microcomputers are not synchronized in the multi-single-chip microcomputer control system in the prior art, is beneficial to improving the accuracy of the system control, and reduces the hardware cost of the multi-single-chip microcomputer control system.

Description

technical field [0001] The invention relates to the field of air conditioners, in particular to a method and device for calibrating a system clock of a single-chip microcomputer, and an air conditioner control system. Background technique [0002] The control circuit of the existing household appliances is generally composed of several circuit boards, and each circuit board is controlled by an independent single-chip microcomputer, and the communication between the circuit boards is realized through communication lines. For example, the control circuit of an air conditioner includes a display circuit, a load control circuit, etc., and each circuit is controlled by an independent single-chip microcomputer, and each single-chip microcomputer is provided with a corresponding clock circuit. [0003] Currently commonly used microcontroller clock circuits include crystal oscillator clock circuits, ceramic oscillator clock circuits, and resistor-capacitor (RC) clock circuits. Amon...

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for calibrating the system clock of single-chip microcomputers, aiming at solving the problem that the clocks of each single-chip microcomputers are not synchronized in the multi-single-chip microcomputer control system, so as to improve the accuracy of system control and reduce the hardware cost of the multi-single-chip microcomputer control system

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