UPD6708 datasheet(57/72 Pages) NEC

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UPD6708 Datasheet(PDF) 57 Page - NEC

Part #	UPD6708

Description	IEBusa Inter Equipment Busa PROTOCOL CONTROL LSI

PDF	72 Pages

Scroll/Zoom	100%

Manufacturer	NEC [NEC]

Direct Link	http://www.nec.com/

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57 / 72 page

µPD6708

8.3.3

Master transmission processing routine

This processing routine is used when a unit becomes the master unit after executing the MREQ1 or MREQ2 command

and transmits data and commands to a slave unit.

This routine is an interrupt service routine, and is executed when the return code (higher 2 bits = 00) is read in master

transmission.

Notes 1.

To transmit the remaining data, execute the MREQ2 command (see 8.3.2 (3)).

To abort master transmission, execute the ABORT command (see 8.3.2 (6)).

N1: Number of master transmit data bytes.

Start

Read STR

Return code 3H?

N1 = 0

Normal end

Set master

transmit data.

WDB full?

Write to WDB

Note 2

Return code 2H?

Note 1

Termination during

transmission

← N1 – 1

Note 2

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