HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 614

• Manufacturer Part Number: HD6417615
• Description: Hardware Manual
• Manufacturer: Hitachi Semiconductor

Serial
data
MPIE
RDF
SCFRDR value
Serial
data
MPIE
RDF
SCFRDR value
Figure 14.15 shows an example of SCIF operation for multiprocessor format reception.
(Example with 8-Bit Data, Multiprocessor Bit, One Stop Bit, LSB-First Transfer)
1
1
RXI interrupt request
(multiprocessor interrupt)
MPIE = 0
RXI interrupt request
(multiprocessor interrupt)
MPIE = 0
Start
bit
Start
bit
0
0
D0
D0
Data (ID2)
Data (ID1)
ID1
Figure 14.15 Example of SCIF Receive Operation
D1
D1
(a) Data does not match station’s ID
(b) Data matches station’s ID
D7
D7
SCFRDR data read
and RDF flag cleared
to 0 by RXI interrupt
handler
SCFRDR data read
and RDF flag cleared
to 0 by RXI interrupt
handler
MPB
MPB
1
1
Stop
bit
Stop
bit
1
1
Start
bit
Start
bit
0
0
Data (Data2)
Data (Data1)
D0
D0
As data is not this
station’s ID,
MPIE bit is set
to 1 again
D1
D1
As data matches this
station’s ID, reception
continues and data is
received by RXI
interrupt handler
D7
D7
ID2
ID1
MPB
MPB
0
0
RXI interrupt request
is not generated,
and SCFRDR
retains its state
Stop
bit
Stop
bit
1
1
Idle state
(mark state)
Idle state
(mark state)
MPIE bit set
to 1 again
Data2
1
1
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