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UPD72042B Datasheet(PDF) 8 Page - NEC |
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UPD72042B Datasheet(HTML) 8 Page - NEC |
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8 / 92 page  µPD72042A, 72042B 8 DATA SHEET S13990EJ2V0DS00 2. IEBus OPERATION 2.1 OVERVIEW The µPD72042A and µPD72042B are CMOS LSI devices for the IEBus interface. The IEBus is designed to enable the data transmission between devices in a small-scale digital data transmission system. The µPD72042A and µPD72042B are 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 µPD72042A or µPD72042B 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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