h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 491

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Figure 15.13 shows an example of SCI operation for multiprocessor format reception.
MPIE
RDRF
RDR
value
MPIE
RDRF
RDR
value
1
1
Start
bit
Start
bit
0
0
MPIE = 0
(Example with 8-Bit Data, Multiprocessor Bit, One Stop Bit)
MPIE = 0
D0
D0
Figure 15.13 Example of SCI Operation in Reception
ID1
D1
D1
RXI interrupt
request
(multiprocessor
interrupt)
generated
Data (ID1)
Data (ID2)
RXI interrupt
request
(multiprocessor
interrupt)
generated
D7
D7
(b) Data matches station’s ID
MPB
MPB
(a) Data does not match station’s ID
1
1
RDR data read
and RDRF flag
cleared to 0 in
RXI interrupt
handling routine
RDR data read and
RDRF flag cleared
to 0 in RXI interrupt
handling routine
Section 15 Serial Communication Interface (SCI, IrDA)
Stop
bit
Stop
bit
1
1
Start
bit
Start
bit
0
0
Rev. 4.00 Jun 06, 2006 page 437 of 1004
D0
D0
If not this station’s ID,
MPIE bit is set to 1
again
Matches this station’s ID,
so reception continues, and
data is received in RXI
interrupt handling routine
D1
D1
Data (Data2)
Data (Data1)
ID1
ID2
D7
D7
MPB
MPB
RXI interrupt request is
not generated, and RDR
retains its state
0
0
REJ09B0301-0400
Stop
bit
Stop
bit
MPIE bit set to 1
again
1
1
Idle state
(mark state)
Idle state
(mark state)
1
1
Data2