POWER SUPPLY MANAGEMENT DEVICE, MICROPROCESSOR INCLUDING THE SAME, AND POWER SUPPLY MANAGEMENT SYSTEM

摘要

PROBLEM TO BE SOLVED: To reduce the number of terminals and suppress an unnecessary data change when switching a terminal function in a power supply management device of a slave device accommodating to a plurality of types of serial interface protocols.SOLUTION: The power supply management device includes a common terminal having a plurality of serial interfaces and operated as an interface of a CPU. The common terminal operates as the serial interface. The power supply management device further includes switching means switchingly sets a serial interface of the common terminal between a PWM (Pulse Width Modulation)interface and an SPI (Serial Peripheral Interface) interface. When changing a terminal function during interruption request, the switching means retains internal terminal function selection data without any change and changes only the terminal function.