H8S2138 Datasheet, PDF (491/1061 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series

Section 15 Serial Communication Interface (SCI, IrDA)
Figure 15.13 shows an example of SCI operation for multiprocessor format reception.
Start
1 bit
Data (ID1)
Stop Start
MPB bit bit
Data (Data1)
Stop
MPB bit
1
0 D0 D1
D7 1 1 0 D0 D1
D7 0
1 Idle state
(mark 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
handling routine
If not this station’s ID, RXI interrupt request is
MPIE bit is set to 1 not generated, and RDR
again
retains its state
(a) Data does not match station’s ID
Start
1 bit
Data (ID2)
Stop Start
MPB bit bit
Data (Data2)
Stop
MPB bit
1
0 D0 D1
D7 1 1 0 D0 D1
D7 0
1 Idle state
(mark state)
MPIE
RDRF
RDR
value
ID1
ID2
Data2
MPIE = 0
RXI interrupt
request
(multiprocessor
interrupt)
generated
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
(b) Data matches station’s ID
Figure 15.13 Example of SCI Operation in Reception
(Example with 8-Bit Data, Multiprocessor Bit, One Stop Bit)
Rev. 4.00 Jun 06, 2006 page 437 of 1004
REJ09B0301-0400