SH7059 Datasheet, PDF (476/1042 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

15. Serial Communication Interface (SCI)
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
(A) ID Does Not Match
No RXI interrupt,
RDR maintains
state
Start Data
1 _{bit (ID2)}
Serial
data
0 D0 D1
Stop Start Data
MPB bit bit (data 2)
D7 1 1 0 D0 D1
Stop
MPB bit
1
D7 0 1 Idling
(marking)
MPB
MPIE
RDRF
RDR
value
ID1
ID2
Data 2
RXI interrupt request
(multiprocessor
interrupt), MPIE = 0
RXI interrupt handler Station's ID, so receiving MPIE
reads data in RDR
continues, with data bit is again
and clears RDRF to 0
received by the RXI
set to 1
interrupt processing routine
(B) ID Matches
Figure 15.15 SCI Receive Operation
(Example: 8-Bit Data with Multiprocessor Bit and One Stop Bit)
Rev.3.00 Mar. 12, 2008 Page 386 of 948
REJ09B0177-0300