SPI communication circuit and method

Abstract

An SPI communication circuit is provided. The circuit comprises an SPI communication module and a clock control module; the SPI communication module is in communication with an external host through an SPI bus; the clock control module controls the clock of the SPI communication module to be switched between the system high-speed clock and the internal low-speed clock; and in a low-power mode, theSPI communication module enters a slave receive mode and operates at the internal low-speed clock. According to the technical scheme of the present invention, communication of the SPI communication module can be performed in the low-power mode.

Description

technical field [0001] The invention relates to a data transmission interface, in particular to an SPI communication circuit and method in a low power consumption mode. Background technique [0002] SPI (Serial Peripheral Interface, Serial Peripheral Interface) is a high-speed, full-duplex, synchronous communication bus, and only occupies four wires on the pins of the chip, saving the pins of the chip and providing The layout of the Printed Circuit Board (PCB) saves space and provides convenience. It is because of this easy-to-use feature that more and more chips integrate this communication protocol. [0003] The ultra-low power series controllers have very strict control over power consumption, and the low power consumption design can prolong the battery life of smart metering devices as much as possible. In the existing design, the SPI module cannot work normally when the system enters the low power consumption mode. [0004] SPI works in a master-slave mode, which usua...

AI Technical Summary

Problems solved by technology

When the system works in normal mode, SPI works at high-speed clock, and the power consumption is high

When the system enters the low power consumption mode, the high-speed clock is turned off, and the SPI cannot communicate with the outside normally.

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