HD6432646 Hitachi, HD6432646 Datasheet - Page 513

• Manufacturer Part Number: HD6432646
• Description: (HD64F264x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

Figure 13-13 shows an example of SCI operation for multiprocessor format reception.
MPIE
RDRF
RDR
value
MPIE
RDRF
RDR
value
1
1
Start
bit
Start
bit
0
0
MPIE = 0
(Example with 8-Bit Data, Multiprocessor Bit, One Stop Bit)
MPIE = 0
D0
D0
Figure 13-13 Example of SCI Operation in Reception
ID1
D1
D1
RXI interrupt
request
(multiprocessor
interrupt)
generated
Data (ID1)
Data (ID2)
RXI interrupt
request
(multiprocessor
interrupt)
generated
D7
D7
(b) Data matches station’s ID
MPB
MPB
(a) Data does not match station’s ID
1
1
RDR data read
and RDRF flag
cleared to 0 in
RXI interrupt
service routine
RDR data read and
RDRF flag cleared
to 0 in RXI interrupt
service routine
Stop
bit
Stop
bit
1
1
Start
bit
Start
bit
0
0
D0
D0
If not this station’s ID,
MPIE bit is set to 1
again
Matches this station’s ID,
so reception continues, and
data is received in RXI
interrupt service routine
D1
D1
Data (Data2)
Data (Data1)
ID1
ID2
D7
D7
MPB
MPB
RXI interrupt request is
not generated, and RDR
retains its state
0
0
Stop
bit
Stop
bit
MPIE bit set to 1
again
1
1
Idle state
(mark state)
Idle state
(mark state)
1
1
Data2
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