D12320VF25V Datasheet, PDF (514/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 12 Serial Communication Interface (SCI)
Figure 12.13 shows an example of SCI operation for multiprocessor format reception.
Start
1 bit
Data (ID1)
Stop Start
MPB bit bit
Data (Data1)
Stop
MPB bit
1
0 D0 D1
D7 1 1 0 D0 D1
D7 0
1 Idle state
(mark state)
MPIE
RDRF
RDR
value
ID1
MPIE = 0
RXI interrupt
request
(multiprocessor
interrupt)
generated
RDR data read
and RDRF flag
cleared to 0 in
RXI interrupt
handling routine
If not this station's ID, RXI interrupt request is
MPIE bit is set to 1 not generated, and RDR
again
retains its state
(a) Data does not match station's ID
Start
1 bit
Data (ID2)
Stop Start
MPB bit bit
Data (Data2)
Stop
MPB bit
1
0 D0 D1
D7 1 1 0 D0 D1
D7 0
1 Idle state
(mark state)
MPIE
RDRF
RDR
value
ID1
ID2
Data2
MPIE = 0
RXI interrupt
request
(multiprocessor
interrupt)
generated
RDR data read and
RDRF flag cleared
to 0 in RXI interrupt
handling routine
Matches this station's ID,
so reception continues, and
data is received in RXI
interrupt handling routine
MPIE bit set to 1
again
(b) Data matches station's ID
Figure 12.13 Example of SCI Receive Operation
(Example with 8-Bit Data, Multiprocessor Bit, One Stop Bit)
Rev.7.00 Feb. 14, 2007 page 480 of 1108
REJ09B0089-0700