CONTROLLING POWER STATES OF A DEVICE

摘要

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for controlling power states of a device. In one aspect, a circuit is configured to perform operations comprising: receiving, on a data pin of an SPI control interface, a command to enter a reduced power mode; determining that a select signal on a select pin of the SPI control interface has been released; in response to receiving the command to enter the reduced power mode and determining that the select signal has been released, causing the circuit to enter the reduced power mode; determining that the select signal on the select pin of the SPI control interface has been asserted; and in response to determining that the select signal on the select pin has been asserted, causing the circuit to exit the reduced power mode.

主权项

1. An electronic device comprising:
a serial peripheral interface (SPI) control interface comprising at least:
a data pin for communicating data; anda select pin for selecting the SPI control interface from a plurality of SPI interfaces; and a circuit configured to:
receive, from the data pin of the SPI control interface, a command to enter a reduced power mode;determine that a select signal on the select pin of the SPI control interface has been released;in response to receiving the command to enter the reduced power mode and determining that the select signal has been released, enter the reduced power mode;determine that the select signal on the select pin of the SPI control interface has been asserted; andin response to determining that the select signal on the select pin has been asserted, exit the reduced power mode.