Hitachi SH7032 - Page 427

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Figure 13.13 shows an example of SCI receive operation using a multiprocessor format.
RDRF
MPIE
RDR
value
ID1
RXI request,
(multiprocessor
interrupt) MPIE = 0
RXI interrupt 
handler reads data
in RDR and clears
RDRF to 0
Not own ID,
so MPIE is
set to 1 again
No RXI
interrupt,
RDR maintains
state
01
1 1
10 1
MPB MPB
Serial
data
Start
bit
Data ID1
Stop
bit
Start
bit
Data 1
Stop
bit
Idle (mark)

state
D
0
D
1
D
7
D
0
D
1
D
7
0
MPB
Figure 13.13 Example of SCI Receive Operation (Own ID Does Not Match Data) (8-Bit
Data with Multiprocessor Bit and One Stop Bit)