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Figure 12.13 shows an example of SCI receive operation using a multiprocessor format.
Start
1
bit
0
MPIE
RDRF
RDR value
RXI interrupt request
MPB detection
(multiprocessor interrupt)
MPIE = 0
Start
1
bit
0
D0
MPIE
RDRF
RDR value
MPB detection
MPIE = 0
402
MPB
Data (ID1)
D0
D7
D1
1
a. Own ID does not match data
Data (ID2)
MPB
D7
D1
1
ID1
RXI interrupt request
(multiprocessor interrupt)
b. Own ID matches data
Figure 12.13 Example of SCI Receive Operation
(8-Bit Data with Multiprocessor Bit and One Stop Bit)
Stop
Start
Data (data1)
bit
bit
0
D0
D1
1
RXI interrupt handler reads
RDR data and clears
RDRF flag to 0
Stop
Start
Data (data2)
bit
bit
0
D0
D1
1
RXI interrupt handler
reads RDR data and
clears RDRF flag to 0
Stop
MPB
bit
D7
1
0
ID1
Not own ID, so MPIE
bit is set to 1 again
Stop
MPB
bit
D7
1
0
ID2
Own ID, so receiving
MPIE bit is set to
continues, with data
1 again
received by RXI
interrupt handler
1
Idle (mark)
state
No RXI interrupt
request, RDR not
updated
1
Idle (mark)
state
Data2
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