479
Figure 13-13 shows an example of SCI operation for multiprocessor format reception.
MPIE
RDR
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 (Data1)
MPB
Stop
bit
RXI interrupt
request
(multiprocessor
interrupt)
generated
MPIE = 0
Idle state
(mark state)
RDRF
RDR data read
and RDRF flag
cleared to 0 in
RXI interrupt
service routine
If not this station’s ID,
MPIE bit is set to 1
again
RXI interrupt request is
not generated, and RDR
retains its state
ID1
(a) Data does not match station’s ID
MPIE
RDR
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 (Data2)
MPB
Stop
bit
RXI interrupt
request
(multiprocessor
interrupt)
generated
MPIE = 0
Idle state
(mark state)
RDRF
RDR data read and
RDRF flag cleared
to 0 in RXI interrupt
service routine
Matches this station’s ID,
so reception continues, and
data is received in RXI
interrupt service routine
MPIE bit set to 1
again
ID2
(b) Data matches station’s ID
Data2
ID1
Figure 13-13 Example of SCI Operation in Reception
(Example with 8-Bit Data, Multiprocessor Bit, One Stop Bit)
Содержание H8S/2645
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