477
Figure 14.16 shows an example of SCI receive operation using a multiprocessor format.
RDRF
MPIE
RDR
value
ID1
RXI interrupt request
(multiprocessor interrupt)
generated, MPIE = 0
Example: Own ID does not match data
RXI interrupt handler
reads RDR data and
clears RDRF bit to 0
ID is not station’s
ID, so MPIE bit is
set to 1 again
No RXI interrupt
generated;
RDR state
is maintained
0
1
1
1
1
0
1
Stop
bit
MPB
Serial
data
Start
bit
Data
(ID1)
Data
(data 1)
Start
bit
MPB
Stop
bit
Idle (mark)
state
D
0
D
1
D
7
D
0
D
1
D
7
0
Figure 14.16 Example of SCI Receive Operation
(8-Bit Data with Multiprocessor Bit and One Stop Bit)
Содержание SH7709S
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Страница 292: ...273 T1 CKIO A25 to A0 CSn RD WR RD D31 to D0 WEn D31 to D0 BS T2 Read Write Figure 10 6 Basic Timing of Basic Interface ...
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