HD6413008F RENESAS [Renesas Technology Corp], HD6413008F Datasheet - Page 412

• Manufacturer Part Number: HD6413008F
• Description: Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
• Manufacturer: RENESAS [Renesas Technology Corp]

12. Serial Communication Interface
Figure 12.13 shows an example of SCI receive operation using a multiprocessor format.
Rev.4.00 Aug. 20, 2007 Page 368 of 638
REJ09B0395-0400
MPIE
RDRF
RDR value
MPIE
RDRF
RDR value
MPB detection
MPIE = 0
MPB detection
MPIE = 0
1
1
Start
bit
Start
bit
0
0
RXI interrupt request
(multiprocessor interrupt)
D0
D0
ID1
(8-Bit Data with Multiprocessor Bit and One Stop Bit)
RXI interrupt request
(multiprocessor interrupt)
Data (ID2)
Data (ID1)
Figure 12.13 Example of SCI Receive Operation
D1
D1
D7
a. Own ID does not match data
b. Own ID matches data
D7
MPB
MPB
1
1
RXI interrupt handler reads
RDR data and clears
RDRF flag to 0
RXI interrupt handler
reads RDR data and
clears RDRF flag to 0
Stop
bit
Stop
bit
1
1
Start
bit
Start
bit
0
0
D0
Data (data1)
Data (data2)
D0
D1
D1
Own ID, so receiving
continues, with data
received by RXI
interrupt handler
Not own ID, so MPIE
bit is set to 1 again
ID2
ID1
D7
D7
MPB
MPB
0
0
1
Stop
bit
Stop
bit
1
MPIE bit is set to
1 again
Idle (mark)
state
Idle (mark)
state
No RXI interrupt
request, RDR not
updated
Data2
1
1