Importance

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Abstract

A slave mode/master mode switching flag, a switch 19, and a start bit 0/1 generator 20 are provided in a two-way communication device 1 incorporated in a microcomputer. In a slave mode, data transmission and reception are synchronized with a start bit over a communication line, and the communication device does not output a start bit for transmission. In a master mode, data transmission is synchronized with a start bit outputted from the communication device, and data reception is synchronized with a start bit over the communication line. The communication device outputs a start bit for communication data. Two-wire two-way serial communication is effected by combining microcomputers set at a master mode. Single-wire two-way serial communication is effected by combining a microcomputer set at a master mode and another microcomputer set at a slave mode.

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First Claim