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Figure 13.13 shows an example of SCI receive operation using a multiprocessor format.
Start
1
bit
0
D0
MPIE
RDRF
RDR value
MPB detection
MPIE = 0
Start
Data (ID2)
1
bit
0
D0
MPIE
RDRF
ID1
RDR value
MPB detection
MPIE = 0
(8-Bit Data with Multiprocessor Bit and One Stop Bit)
Stop
Data (ID1)
MPB
bit
D7
D1
1
RXI interrupt
RXI interrupt handler reads
request
RDR data and clears
(multiprocessor
RDRF flag to 0
interrupt)
a. Own ID does not match data
Stop
MPB
bit
D7
D1
1
RXI interrupt
RXI interrupt handler
request
reads RDR data and
(multiprocessor
clears RDRF flag to 0
interrupt)
b. Own ID matches data
Figure 13.13 Example of SCI Receive Operation
Section 13 Serial Communication Interface
Start
Data (data1)
bit
0
1
D0
D1
Not own ID, so MPIE
bit is set to 1 again
Start
Data (data1)
bit
0
D0
D1
1
Own ID, so receiving
continues, with data
received by RXI
interrupt handler
Rev. 4.00 Jan 26, 2006 page 525 of 938
Stop
MPB
bit
D7
0
1
Idle (mark)
state
ID1
No RXI interrupt
request, RDR not
updated
Stop
MPB
bit
D7
1
0
Idle (mark)
state
ID2
Data2
MPIE bit is set to
1 again
REJ09B0276-0400
1
1
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