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UPD72042 Datasheet(PDF) 8 Page - NEC |
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UPD72042 Datasheet(HTML) 8 Page - NEC |
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8 / 92 page  µPD72042 8 Data Sheet S14870EJ1V0DS00 2. IEBus OPERATION 2.1 OVERVIEW The µPD72042 is a CMOS LSI device for the IEBus interface. The IEBus is designed to enable the data transmission between devices in a small-scale digital data transmission system. The µPD72042 is connected to a microcomputer built into a device. A serial interface (SCK, SO, and SI pins) is used for connection. The host controller (microcomputer) sets the commands and data needed for data transmission via this serial interface. When data is transmitted, the host controller sets the data in the µPD72042 via the serial interface. Then, signals are output on the BUS pins (BUS+, BUS–). When data is received from the BUS pins, the host controller can read it via the serial interface. |
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