HD6473837H Datasheet, PDF (307/562 Pages) Renesas Technology Corp – Hardware Manual

Figure 10.26 gives an example of data reception using a multiprocessor format.
Serial
data
MPIE
Start
bit
Receive
Stop Start
data (ID1) MPB bit bit
Receive
Stop
data (data 1) MPB bit
1 0 D0 D1
D7 1 1 0 D0 D1
D7 0 1
1 frame
1 frame
Mark
(idle state)
1
RDRF
RDR
value
SCI3 operation
User processing
ID1
RXI request
RDRF cleared to 0
MPIE cleared to 0
No RXI request
RDR state retained
Read data from RDR If not own ID,
set MPIE to 1 again
(a) Data does not match own ID
Serial
data
MPIE
Start
bit
Receive
Stop Start
data (ID2) MPB bit bit
Receive
Stop Mark
data (data 2) MPB bit (idle state)
1 0 D0 D1
D7 1 1 0 D0 D1
D7 0 1 1
1 frame
1 frame
RDRF
RDR
value
ID1
ID2
Data 2
SCI3 operation
User processing
RXI request
RDRF cleared to 0
MPIE cleared to 0
Read data from RDR
RXI
request
RDRF
cleared
to 0
If own ID, continue
receiving
Read data
from RDR
and set
MPIE to 1
again
(b) Data matches own ID
Figure 10.26 Example of Multiprocessor Format Receive Operation
(8-Bit Data, Multiprocessor Bit Added, and 1 Stop Bit)
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