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Rev. 5.00, 09/03, page 472 of 760
Figure 14.16 shows an example of SCI receive operation using a multiprocessor format.
RDRF
MPIE
RDR
value
ID1
RXI interrupt request
(multiprocessor interrupt)
generated, MPIE = 0
Example: Own ID does not match data
RXI interrupt handler
reads RDR data and
clears RDRF bit to 0
ID is not station's
ID, so MPIE bit is
set to 1 again
No RXI interrupt
generated;
RDR state
is maintained
01
1 1
10 1
Stop
bitMPB
Serial
data
Start
bit
Data
(ID1)
Data
(data 1)
Start
bit
MPB
Stop
bit
Idle (mark)
state
D
0
D
1
D
7
D
0
D
1
D
7
0
Figure 14.16 Example of SCI Receive Operation
(8-Bit Data with Multiprocessor Bit and One Stop Bit)