HD64F7051SFJ20V Datasheet, PDF (435/843 Pages) Renesas Technology Corp – Hardware Manual Renesas 32-Bit RISC

Section 13 Serial Communication Interface (SCI)
Figures 13.14 and 13.15 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 13.14 SCI Receive Operation (ID Does Not Match)
Rev. 5.00 Jan 06, 2006 page 413 of 818
REJ09B0273-0500