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UPD72042B Datasheet(PDF) 39 Page - NEC

Part # UPD72042B
Description  LSI DEVICES FOR Inter Equipment BusTM (IEBusTM) PROTOCOL CONTROL
PDF  92 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD72042B Datasheet(HTML) 39 Page - NEC

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µPD72042A, 72042B
39
DATA SHEET S13990EJ2V0DS00
[Control bits]
This control field is used to set the control bits (four bits).
• Contents of control bits
Bit 3Note 1
Bit 2
Bit 1
Bit 0
FunctionNote 2
0H
0
0
0
0
Slave status (SSR) read
1H
0
0
0
1
Undefined
2H
0
0
1
0
Undefined
3H
0
0
1
1
Data read and lock
4H
0
1
0
0
Lock address read (low-order 8 bits)
5H
0
1
0
1
Lock address read (high-order 4 bits)
6H
0
1
1
0
Slave status (SSR) read and unlock
7H
0
1
1
1
Data read
8H
1
0
0
0
Undefined
9H
1
0
0
1
Undefined
AH
1
0
1
0
Command write and lock
BH
1
0
1
1
Data write and lock
CH
1
1
0
0
Undefined
DH
1
1
0
1
Undefined
EH
1
1
1
0
Command write
FH
1
1
1
1
Data write
Notes 1. The value of bit 3 (MSB) determines the transfer direction of the subsequent data-length field data and
data field data.
When bit 3 is set to 1: Data is transferred from the master unit to a slave unit.
When bit 3 is set to 0: Data is transferred from a slave unit to the master unit.
2. 3H, 6H, AH, and BH are control bits used for lock setting and cancellation.
When an undefined value of 1H, 2H, 8H, 9H, CH, or DH is sent, no acknowledgement is returned.



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