HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 492

• Manufacturer Part Number: HD6433044
• Description: (HD64 Series) Hitachi Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

Figure 13-13 shows an example of SCI receive operation using a multiprocessor format.
Figure 13-13 Example of SCI Receive Operation (8-Bit Data with Multiprocessor Bit and
MPIE
RDRF
RDR value
MPIE
RDRF
RDR value
MPB detection
MPIE= 0
MPB detection
MPIE= 0
1
1
Start
bit
Start
bit
0
0
Data (ID1)
Data (ID2)
D0
D0
D1
D1
RXI request
(multiprocessor
interrupt)
RXI request
(multiprocessor
interrupt)
a. Own ID does not match data
D7
D7
b. Own ID matches data
MPB
MPB
One Stop Bit)
1
1
Stop
bit
Stop
bit
481
RXI handler reads
RDR data and clears
RDRF flag to 0
RXI interrupt handler
reads RDR data and
clears RDRF flag to 0
1
1
Start
bit
Start
bit
0
0
Data (data1)
Data (data2)
D0
D0
ID2
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
ID1
D7
D7
MPB
MPB
0
0
Stop
bit
Stop
bit
No RXI request,
RDR not updated
1
1
MPIE bit is set
to 1 again
Data 2
Idle (mark)
state
Idle (mark)
state
1
1