UPD72042BGT NEC [NEC], UPD72042BGT Datasheet - Page 53

• Manufacturer Part Number: UPD72042BGT
• Description: LSI DEVICE FOR Inter Equipment Bus (IEBus) PROTOCOL CONTROL
• Manufacturer: NEC [NEC]

CMR register with DERC = 1.
0110 is set to 0.
1100
Table 4-9 SLRC Return Code in Broadcast Reception When the Optional Function Is Set (DERC = 1)
Table 4-9 indicates the SLRC return code issued in broadcast reception when an optional function is set in the
Note RBF is ready for reception according to the optional function setting in CMR, as described below.
When RBF is ready for reception, bit 1 of slave status transmitted from the master unit with control bits 0000 or
SLRC
(i) When MFC = 0
(ii) When MFC = 1
The SLRE flag of the FLG register is 1 (slave reception and broadcast reception only); and
RBF is empty.
The SLRE flag of the FLG register is 1 (slave reception and broadcast reception only); and
RBF has at least 4 bytes of free space.
1. Meaning: Broadcast reception error
2. Occurrence condition: This return code is issued if RBF is not ready for reception
3. Microcomputer processing: A broadcast address can be read from DAR1 and DAR2. However, the
control field is received. In this case, the master address in the communication frame is set as a
broadcast address in DAR2 and DAR1.
data of DAR1 and DAR2 is updated each time a broadcast reception error occurs. So, ensure that data
is read from DAR1 and DAR2 within the interval indicated below.
• Read time: Approx. 5420 s (mode 0)
Approx. 1490 s (mode 1)
Data Sheet S13990EJ3V0DS
Description
Note
PD72042B
when the
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