UPD72042BGT NEC [NEC], UPD72042BGT Datasheet - Page 74

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

74
(1) Master transmission processing routine 1
Fig. 6-6 shows the flow of master transmission processing routine 1.
SAR1
SAR2
MCR
TBF
1
1
TBF
Slave address (four low-order bits)
Slave address (eight high-order bits)
Broadcast bits, number of arbitrations,
and control bits (The MSB is 1.)
Transmission data (I-th byte)
I >
CMR
Number of bytes
in tranmission data
in transmission data
Number of bytes
Fig. 6-6 Flow of Master Transmission Processing Routine 1
Read STR
Read FLG
Read FLG
Read STR
I
I
CEX?
TEP?
CEX?
TFL?
Start
00010000
I + 1
0
1
0
0
N
0
1
1
Y
Data Sheet S13990EJ3V0DS
1
; Waiting for termination of previous command?
; Set clear command for transmission buffer.
; Waiting for termination of processing of
; Initialize I.
CMR
transmission buffer clear command?
MTRQF
Read FLG
CEX?
End
00001000
0
; Setting tranmission data in TBF completed?
1
;
; Waiting for termination of
Set master communication
request command.
processing of master communication
request command?
PD72042B