Microcomputer system automatically backing-up data written in storage medium in transceiver, and transceiver connected thereto

摘要

A microcomputer system includes a transceiver used in Ethernet (R) and a microcomputer backing up data in the transceiver. The transceiver, upon receiving a request for data write in a primary storage medium from a host device, outputs an interruption request to the microcomputer. The microcomputer, upon receiving the interruption request, reads data written in the primary storage medium and writes the data in a second storage medium. Therefore, if the data written in the primary storage medium is lost due to a momentary power failure and the like, the data of the primary storage medium can be restored.