Patent ID: 9552048
Date: 2017-01-24
CPC Classifications: G06F,Y02D

Claim:
1. An electronic system comprising: a USB host; and a USB device that includes a transmission-reception section for communicating with the USB host through a USB cable having a signal line D+ and a signal line D−, wherein the USB device is switchable between a normal power mode and a power saving mode, the electronic system performs a process for switching the USB device from the normal power mode to the power saving mode, the process including: the USB device further includes: a pull-up resistor for pulling up a potential of the signal line D+ or the signal line D− to a predetermined level so as to allow the USB host to detect a speed of the communication with the USB host; and a switch for enabling or disabling the pull-up by the pull-up resistor, and the electronic system performs a process for resuming the transmission of the status request to the USB device via the USB host, the process including: