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UPD6708 データシート(PDF) 57 Page - NEC

部品番号 UPD6708
部品情報  IEBusa Inter Equipment Busa PROTOCOL CONTROL LSI
PDF  72 Pages
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メーカー  NEC [NEC]
ホームページ  http://www.nec.com/
Logo NEC - NEC

UPD6708 データシート(HTML) 57 Page - NEC

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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)).
2.
N1: Number of master transmit data bytes.
Start
Read STR
Return code 3H?
N1 = 0
Normal end
N
Y
Set master
transmit data.
WDB full?
Write to WDB
N
Note 2
Return code 2H?
Y
N
Y
Note 1
Termination during
transmission
N1
← N1 – 1
Note 2
N
Y



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