Datasheet

Section 15 Serial Communication Interface (SCI, IrDA)
R01UH0310EJ0500 Rev. 5.00 Page 915 of 1384
Sep 25, 2012
H8S/2426, H8S/2426R, H8S/2424 Group
MPIE
RDR
value
0 D0 D1 D7 1 1 0 D0 D1 D7 01
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
handling 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 01
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
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
Data2ID1
Figure 15.12 Example of SCI Operation in Reception
(Example with 8-Bit Data, Multiprocessor Bit, One Stop Bit)