SH7014 Datasheet, PDF (384/754 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

12. Serial Communication Interface (SCI)
Figures 12.13 (1) and (2) show examples of SCI receive operation using a multiprocessor format.
Serial
data
Start Data
1 _{bit (ID1)}
0 D0 D1
Stop Start Data
MPB bit bit (data 1)
D7 1 1 0 D0 D1
Stop
MPB bit
1
D7 0 1 Idling
(marking)
MPB
MPIE
RDRF
RDR
value
ID1
RXI interrupt request
(multiprocessor
interrupt), MPIE = 0
RXI interrupt handler
reads data in RDR
and clears RDRF to 0
Not station's
ID, so MPIE is
set to 1 again
No RXI interrupt,
RDR maintains
state
Figure 12.13 SCI Receive Operation (ID Does Not Match) (1)
Rev.5.00 Sep. 27, 2007 Page 350 of 716
REJ09B0398-0500