Renesas H8S/2319 series Hardware Manual page 499

Figure 12-13 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)
Data (ID1)
MPB
D1 D7 1
RXI interrupt RDR data read
request and RDRF flag
(multiprocessor cleared to 0 in
interrupt) RXI interrupt
handling routine
generated
(a) Data does not match station's ID
Data (ID2)
MPB
D1 D7 1
ID1
RXI interrupt RDR data read and
RDRF flag cleared
request
to 0 in RXI interrupt
(multiprocessor
handling routine
interrupt)
generated
(b) Data matches station's ID
Figure 12-13 Example of SCI Receive Operation
Stop Start Data (Data1)
bit bit
1 0 D0 D1
If not this station's ID,
MPIE bit is set to 1
again
Stop Start Data (Data2)
bit bit
1 0 D0 D1
Matches this station's ID,
so reception continues, and
data is received in RXI
interrupt handling routine
Rev. 5.00, 12/03, page 469 of 1088
Stop
MPB bit
1
D7 0 1 Idle state
(mark state)
ID1
RXI interrupt request is
not generated, and RDR
retains its state
Stop
MPB bit
1
D7 0 1 Idle state
(mark state)
ID2 Data2
MPIE bit set to 1
again