DF2211NP24V Renesas Technology / Hitachi Semiconductor, DF2211NP24V Datasheet - Page 470

• Manufacturer Part Number: DF2211NP24V
• Description: H8S/2200 Series, 2212 Group, USB, RTC, HSS TNP-64B; Vcc= 2.7 to 3.6 volts, Temp= -20 to 75 C; Package: PVQN0064LB-A
• Manufacturer: Renesas Technology / Hitachi Semiconductor

12.5.2
Figure 12.16 shows a sample flowchart for multiprocessor serial data reception. If the MPIE bit in
SCR is set to 1, data is skipped until data with a 1 multiprocessor bit is sent. On receiving data
with a 1 multiprocessor bit, the receive data is transferred to RDR. An RXI interrupt request is
generated at this time. All other SCI operations are the same as in asynchronous mode. Figure
12.15 shows an example of SCI operation for multiprocessor format reception.
Rev.7.00 Dec. 24, 2008 Page 416 of 698
REJ09B0074-0700
MPIE
RDRF
RDR
value
MPIE
RDRF
RDR
value
Multiprocessor Serial Data Reception
1
1
Start
bit
Start
bit
0
0
(Example with 8-Bit Data, Multiprocessor Bit, One Stop Bit)
MPIE = 0
MPIE = 0
D0
D0
Figure 12.15 Example of SCI Operation in Reception
ID1
D1
D1
Data (ID1)
Data (ID2)
RXI interrupt
request
(multiprocessor
interrupt)
generated
RXI interrupt
request
(multiprocessor
interrupt)
generated
D7
D7
(a) Data does not match station’s ID
(b) Data matches station’s ID
MPB
MPB
1
1
RDR data read and
RDRF flag cleared
to 0 in RXI interrupt
service routine
RDR data read
and RDRF flag
cleared to 0 in
RXI interrupt
service routine
Stop
bit
Stop
bit
1
1
Start
bit
Start
bit
0
0
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 service routine
D1
D1
Data (Data1)
Data (Data2)
ID2
ID1
D7
D7
MPB
MPB
0
0
RXI interrupt request is
not generated, and RDR
retains its state
Stop
bit
Stop
bit
1
1
MPIE bit set to 1
again
Idle state
(mark state)
Idle state
(mark state)
Data2
1
1