System clock

Abstract

The invention relates to the integrated circuit field, and discloses a system clock; the system clock comprises a first timer and a second timer, wherein the first timer is higher in precision than the second timer; the second timer continuously counts, and the count value of the second timer is the first count value; the first time counts when the system is in a communication status, and the count value of the first timer is the second count value; when the first count value of the second timer reaches a preset value, the system is waken up; when the system is waken up, the first timer can convert the present first count value into a first conversion value according to the frequencies of the first and second timers; the first conversion value can serve as the present second count value for continuous counting. The system clock can improve clock precision, and can limit system power consumption, thus reducing cost.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a system clock. Background technique [0002] The system clock we usually refer to refers to the clock system, which is composed of an oscillator, a timing wake-up device, a frequency divider, etc. The system clock is the pulse of a system. Driven by the system clock, the processor completes the execution instructions of the system. Driven by the system clock, the peripheral components complete data transmission, reception, analog signal and digital signal conversion, etc., therefore, The system clock plays a vital role for a system to function properly. [0003] In the field of wireless network technology, in the application of low-power bluetooth or zigbee, the communication node of the system will communicate twice, first in the low-power mode, the system enters the sleep state, and then wakes up at the same time point, to communicate again, so each communicating node has ...

AI Technical Summary

Problems solved by technology

[0004] The more common oscillator in the system clock in the prior art is the crystal oscillator, referred to as "crystal oscillator", and generally only one low-precision 32K crystal oscillator is used as a timer for timing, but the timing accuracy of the 32K crystal oscillator is 33us, and the timing accuracy is poor

Therefore, the system needs a high-precision timer to replace the low-precision 32K crystal oscillator timer, but this will lead to excessive power consumption in the working state of the system, so that it cannot work normally

[0005] In addition, since the crystal oscillator is an external device, the cost is relatively high

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