HD6473032F16 Datasheet, PDF (509/847 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Section 13 Serial Communication Interface
Figure 13.13 shows an example of SCI receive operation using a multiprocessor format.
MPIE
RDRF
Start
1
bit Data (ID1)
0 D0 D1
Stop Start
MPB bit bit Data (data1)
D7 1 1 0 D0 D1
Stop
MPB bit
D7 0 1
1
Idle (mark)
state
RDR value
MPB detection
MPIE= 0
ID1
RXI request
(multiprocessor
interrupt)
RXI interrupt handler
reads RDR data and
clears RDRF flag to 0
Not own ID, so
MPIE bit is set
to 1 again
No RXI request,
RDR not updated
a. Own ID does not match data
MPIE
RDRF
Start
1
bit Data (ID2)
0 D0 D1
Stop Start
MPB bit bit Data (data2)
D7 1 1 0 D0 D1
Stop
MPB bit
D7 0 1
1
Idle (mark)
state
RDR value
MPB detection
MPIE= 0
RXI request
(multiprocessor
interrupt)
ID2
Data 2
RXI interrupt handler Own ID, so receiving MPIE bit is set
reads RDR data and continues, with data to 1 again
clears RDRF flag to 0 received by RXI
interrupt handler
b. Own ID matches data
Figure 13.13 Example of SCI Receive Operation
(8-Bit Data with Multiprocessor Bit and One Stop Bit)
Rev. 3.00 Mar 21, 2006 page 479 of 814
REJ09B0302-0300