Rev. 1.0, 02/00, page 441 of 1141
Figure 22.15 shows an example of SCI operation for multiprocessor format reception.
MPIE
RDR1
value
0
D0
D1
D7
1
1
0
D0
D1
D7
0
1
1
1
Data (ID1)
Start
bit
MPB
Stop
bit
Start
bit
Data (Data 1)
MPB
Stop
bit
RXI interrupt
request (multi-
processor
interrupt)
generated
Idle state
(mark state)
RDRF
RDR1 data read
and RDRF flag
cleared to 0 in
RXI interrupt
handling routine
If not this station's
ID, MPIE bit is set
to 1 again
RXI interrupt request
is not generated, and
RDR1 retains its state
ID1
(a) Data does not match station's ID
MPIE
RDR1
value
0
D0
D1
D7
1
1
0
D0
D1
D7
0
1
1
1
Data (ID2)
Start
bit
MPB
Stop
bit
Start
bit
Data (Data 2)
MPB
Stop
bit
RXI interrupt
request (multi-
processor
interrupt)
generated
Idle state
(mark state)
RDRF
RDR1 data read and
RDRF flag cleared
to 0 in RXI interrupt
handling routine
Matches this station's
ID, so reception continues,
and data is received in RXI
interrupt handling routine
MPIE bit set
to 1 again
ID2
(b) Data matches station's ID
Data2
ID1
MPIE=0
MPIE=0
Figure 22.15 Example of SCI Operation in Reception
(Example with 8-Bit Data, Multiprocessor Bit, One Stop Bit)