Power saving control system and method for use with serially connected electronic devices

摘要

A system including a plurality of electronic devices connected together through a bus, which can realize reduction in power consumption while ensuring communications. When a bias voltage on an external bus is detected by a bias detecting circuit and a comparator, a bias voltage is output from a bias output terminal to the external bus enabling it. When a driver and receiver receive a PHY-SLEEP command through the external bus, the bias voltage kept output from the bias output terminal to the external bus is turned disabling it.