H8S2556 Datasheet, PDF (489/982 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer H8S Family/H8S/2500 Series

Section 13 Serial Communication Interface (SCI)
Start
1 bit
Multi-
Data (ID1) processor Stop Start
bit bit bit
Multi-
Data (Data1) processor Stop
bit bit
1
0 D0 D1
D7 1 1 0 D0 D1
D7 0
1 Mark state
(idle state)
MPIE
RDRF
RDR
value
ID1
MPIE = 0
RXI interrupt
request
(multiprocessor
interrupt)
generated
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
(a) Data does not match station’s ID
Start
1 bit
Multi-
Data (ID2) processor Stop Start
bit bit bit
Multi-
Data (Data2) processor Stop
bit bit
1
0 D0 D1
D7 1 1 0 D0 D1
D7 0
1 Mark state
(idle state)
MPIE
RDRF
RDR
value
ID1
MPIE = 0
ID2
Data2
RXI interrupt
request
(multiprocessor
interrupt)
generated
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
(b) Data matches station’s ID
Figure 13.12 Example of SCI Operation in Reception
(Example with 8-Bit Data, Multiprocessor Bit, One Stop Bit)
Rev.5.00 Sep. 27, 2007 Page 443 of 932
REJ09B0099-0500