Figure 14.12 Example Of Sci Operation In Reception (Example With 8-Bit Data, Multiprocessor Bit, One Stop Bit) - Renesas H8S/2368 Series Hardware Manual

Start
bit
1
0 D0
MPIE
RDRF
RDR
value
MPIE = 0
Start
bit
1
0 D0
MPIE
RDRF
RDR
ID1
value
MPIE = 0
Figure 14.12 Example of SCI Operation in Reception
(Example with 8-Bit Data, Multiprocessor Bit, One Stop Bit)
Data (ID1) Stop
MPB bit
D1 D7 1
RXI interrupt RDR data read
request and RDRF flag
(multiprocessor cleared to 0 in
RXI interrupt
interrupt)
handling routine
generated
(a) Data does not match station's ID
Data (ID2) Stop
MPB bit
D1 D7 1
RXI interrupt RDR data read and
request RDRF flag cleared
(multiprocessor to 0 in RXI interrupt
handling routine
interrupt)
generated
(b) Data matches station's ID
Start Data (Data1)
bit
1 0 D0 D1
If not this station's ID,
MPIE bit is set to 1
again
Start Data (Data2)
bit
1 0 D0 D1
Matches this station's ID,
so reception continues, and
data is received in RXI
interrupt handling routine
Rev. 2.00, 05/03, page 555 of 820
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