Control system and control method for dynamic control of crystal clock generator

Abstract

The invention discloses a control system for dynamic control of a crystal clock generator. The system comprises a central processing unit, a crystal clock generator, a flash memory controller, a resistance-capacitance clock generator and a crystal, the central processing unit is respectively in bidirectional connection with the crystal clock generator, the flash memory controller and the resistance-capacitance clock generator, and the crystal clock generator is connected with the crystal. In this way, the crystal clock generator configuration file in the flash memory is read through the chip flash memory controller, the starting time point of the crystal clock generator is flexibly controlled, and the influence of chip initialization and crystal clock oscillator starting time superpositionon real-time requirement application is reduced. The improved chip clock generator control system starts the crystal clock generator in advance by adding a control signal from the flash memory controller to the crystal clock generator, and accelerates initialization after the chip is awakened.

Description

technical field [0001] The invention relates to a crystal clock generator control system and a control method, in particular to a dynamic control crystal clock generator control system. Background technique [0002] Many chips such as microcontroller chips and audio codec chips have built-in crystal clock generators. In chip low power mode, in order to reduce power consumption, the crystal clock generator will be turned off. [0003] When the chip is woken up by an internal or external exception through an interrupt, the clock provided by the internal resistance-capacitance clock generator is used for initialization, mainly for the initialization of the embedded flash memory processor. After the initialization is completed, the user program will start the high-precision crystal clock generator to provide high-precision clocks for subsequent chip operations. [0004] Generally, the initialization of the chip will take 10-1000us, and the start-up of the crystal clock generat...

AI Technical Summary

Problems solved by technology

[0004] Generally, the initialization of the chip will take 10-1000us, and the start-up of the crystal clock generator will take 100-500us. The two superimposed, the real work of the chip will be after 1.5ms, which is difficult to meet the application requirements with high real-time requirements.

[0005] Therefore, the traditional chip clock control system is a walk-through operation for each step, which consumes too much time and has great limitations for applications with high real-time requirements.

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