HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 676

• Manufacturer Part Number: HD6412320
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 14 Serial Communication Interface (SCI)
Figure 14.13 shows an example of SCI operation for multiprocessor format reception.
Rev.6.00 Sep. 27, 2007 Page 646 of 1268
REJ09B0220-0600
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
ID1
Figure 14.13 Example of SCI Receive Operation
D1
D1
RXI interrupt
request
(multiprocessor
interrupt)
generated
Data (ID2)
Data (ID1)
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
handling routine
RDR data read and
RDRF flag cleared
to 0 in RXI interrupt
handling 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 handling 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