A low-power and accurate sleep timer circuit and method

Abstract

The invention relates to a low-power consumption and accurate sleep timer circuit. The low-power consumption and accurate sleep timer includes a high-frequency clock source, a low-frequency clock source, a clock state indicating circuit, a control circuit, timers, a high-frequency timing margin calculator, a low-frequency timing margin calculator, comparators and a timer result decision device. According to a low-power consumption and accurate sleep timing method, sleep timing is completed by means of automatic switching of two timers. According to the circuit of the invention, circuit structures such as the high-frequency clock source, the low-frequency clock source, the clock state indicating circuit, the control circuit, the high-frequency timing margin calculator and the low-frequency timing margin calculator are adopted; and according to the method, hardware is utilized to control the high-frequency timing margin calculator and the low-frequency timing margin calculator. With the circuit and method adopted, a detect that switching is carried out by means of a processor in the prior art can be eliminated, the resource overhead of the processor can be decreased, timing accuracy can be improved, and power consumption of a system can be decreased.

Description

technical field [0001] The invention relates to a dormancy timer circuit and method with low power consumption and precision, in particular to a system-on-chip chip-oriented dormancy timer circuit and method which can effectively reduce power consumption and provide precise timing. Background technique [0002] Timing issues are a very common problem in embedded systems. Different embedded processors contain different timing units, and different system applications require different timing applications. Common timer types include general timers, input pulse length timers, output pulse timers, multiple input / output timers, and timers combined with functional modules. There are more types of timers for applications, such as sending timers, receiving timers, sleep timers, and real-time clock timers. [0003] A sleep timer is a type of timer. The working principle of the ideal sleep timer is generally to set a timing time before the system sleeps, and it is started during sle...

AI Technical Summary

Problems solved by technology

This method solves the problem of power consumption and precision to a certain extent, but it is still not ideal for the following reasons: the participation of the processor will still generate unnecessary power consumption; the non-determinism of processor wake-up leads to sleep timing imprecision

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