hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 424

• Manufacturer Part Number: hd64338023s
• Description: Renesas 8-bit Single-chip Microcomputer Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

Section 10 Serial Communication Interface
Rev. 7.00 Mar 10, 2005 page 382 of 652
REJ09B0042-0700
Serial
data
MPIE
RDRF
RDR
value
LSI
operation
User
processing
RDR
value
Serial
data
MPIE
RDRF
LSI
operation
User
processing
Figure 10.20 Example of Operation when Receiving using Multiprocessor Format
1
1
Start
Start
bit
bit
0
0
D0
D0
ID1
(8-Bit Data, Multiprocessor Bit, 1 Stop Bit)
D1
D1
(a) When data does not match this receiver's ID
RXI request
MPIE cleared
to 0
data (ID1)
RXI request
MPIE cleared
to 0
data (ID2)
Receive
Receive
1 frame
1 frame
(b) When data matches this receiver's ID
D7
D7
MPB
MPB
1
1
RDRF cleared
to 0
RDR data read
Stop
RDRF cleared
to 0
RDR data read
Stop
bit
1
bit
1
Start
Start
bit
0
bit
0
D0
D0
1 frame
1 frame
Receive data
D1
Receive data
D1
ID2
(Data1)
(Data2)
When data is not
this receiver's ID,
bit MPIE is set to
1 again
When data is
this receiver's
ID, reception
is continued
RXI request
ID1
D7
D7
MPB
MPB
0
0
Stop
Stop
RDRF cleared
to 0
bit
bit
1
1
No RXI request
RDR retains
previous state
RDR data read
Bit MPIE set to
1 again
Mark state
(idle state)
Mark state
(idle state)
Data2
1
1