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Figure 16-13 shows an example of SCI operation for multiprocessor format reception.
Start
bit
1
0
D0
MPIE
RDRF
RDR
value
MPIE = 0
Start
bit
1
0
D0
MPIE
RDRF
RDR
value
MPIE = 0
(Example with 8-Bit Data, Multiprocessor Bit, One Stop Bit)
636
Data (ID1)
MPB
D1
D7
RXI interrupt
request
(multiprocessor
interrupt)
generated
Data (ID2)
MPB
D1
D7
ID1
RXI interrupt
request
(multiprocessor
interrupt)
generated
(b) Data matches station's ID
Figure 16-13 Example of SCI Operation in Reception
Stop
Start
bit
bit
1
1
0
D0
RDR data read
If not this station's ID,
and RDRF flag
MPIE bit is set to 1
cleared to 0 in
again
RXI interrupt
service routine
(a) Data does not match station's ID
Stop
Start
bit
bit
1
1
0
D0
RDR data read and
Matches this station's ID,
RDRF flag cleared
so reception continues, and
to 0 in RXI interrupt
data is received in RXI
service routine
interrupt service routine
Data (Data1)
MPB
D1
D7
0
ID1
RXI interrupt request is
not generated, and RDR
retains its state
Data (Data2)
MPB
D1
D7
0
ID2
Stop
bit
1
1
Idle state
(mark state)
Stop
bit
1
1
Idle state
(mark state)
Data2
MPIE bit set to 1
again
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