USING USB SIGNALING ON A USB HOST TO TRIGGER A USB DEVICE TO ENTER A MODE OF OPERATION

摘要

A method of triggering a desired operating mode in a universal serial bus (USB)-compatible client device is provided. A USB-compatible client device detects that it has been coupled to a USB-compatible host device via a USB bus. The USBcompatible client device attempts to pull a data line of the USB bus high. The USBcompatible client device then ascertains that the data line remains pulled low, thereby indicating that the USB-compatible client device should enter a first mode of operation. The USB-compatible client device operates according to the first mode of operation.