HD64F3670 RENESAS [Renesas Technology Corp], HD64F3670 Datasheet - Page 214

• Manufacturer Part Number: HD64F3670
• Description: Hitachi Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Rev. 2.0, 03/02, page 190 of 298
Figure 13.18 Example of SCI3 Operation in Reception Using Multiprocessor Format
Serial
data
MPIE
RDRF
RDR
value
LSI
operation
User
processing
RDR
value
Serial
data
MPIE
RDRF
LSI
operation
User
processing
1
1
(Example with 8-Bit Data, Multiprocessor Bit, One Stop Bit)
Start
Start
bit
bit
0
0
D0
D0
ID1
D1
D1
(a) When data does not match this receiver's ID
RXI interrupt
request
MPIE cleared
to 0
RXI interrupt
request
MPIE cleared
to 0
data (ID1)
data (ID2)
Receive
Receive
1 frame
1 frame
(b) When data matches this receiver's ID
D7
D7
MPB
MPB
1
1
RDRF flag
cleared
to 0
RDR data read
Stop
RDRF flag
cleared
to 0
RDR data read
Stop
bit
1
bit
1
Start
Start
bit
0
bit
0
D0
D0
1 frame
1 frame
D1
Receive data
Receive data
D1
ID2
(Data1)
(Data2)
When data is not
this station's ID,
MPIE is set to 1
again
When data is
this station's
ID, reception
is continued
RXI interrupt
request
ID1
D7
D7
MPB
MPB
0
0
Stop
Stop
RDRF flag
cleared
to 0
bit
bit
1
1
RXI interrupt request
is not generated, and
RDR retains its state
RDR data read
MPIE set to 1
again
Mark state
Mark state
(idle state)
(idle state)
Data2
1
1