R8CL35A Datasheet, PDF (594/848 Pages) Renesas Technology Corp – RENESAS MCU R8C FAMILY / R8C/Lx SERIES

Under development ^{Preliminary specification}
Specifications in this manual are tentative and subject to change.
R8C/L35A Group, R8C/L36A Group, R8C/L38A Group, R8C/L3AA Group,
R8C/L35B Group, R8C/L36B Group, R8C/L38B Group, R8C/L3AB Group
25. Serial Interface (UART2)
Serial data
MP bit in
1
U2SMR5 register
MPIE bit in
1
U2SMR5 register ₀
RI bit in
1
U2C1 register
0
Start
bit
Receive
data (ID1)
Stop
MPRB bit
Receive
data (DATA1)
MPRB
1
0 D0 D1
D7 1 1 0 D0 D1
D7 0 1
Marked state
(Idle state)
1
1 frame
1 frame
U2RB register
MCU operation
User processing
ID1
Detect the MPRB bit and ^{A reception complete}
set the MPIE bit to 0.
interrupt request is
generated.
Set the RI bit to 0.
Read data in
If data does not match
the U2RB register. ^{own station ID, set the}
MPIE bit to 1 again.
(a) When Data Does Not Match Own Station ID
No reception complete
interrupt request is
generated.
The U2RB register retains
its state.
Serial data
Start
bit
Receive
data (ID2)
Stop
MPRB bit
1
0 D0 D1
D7 1 1 0
Receive
data (DATA2)
MPRB
D0 D1
D7 0 1
Marked state
(Idle state)
1
MP bit in
1
U2SMR5 register
MPIE bit in
1
U2SMR5 register ₀
RI bit in
1
U2C1 register
0
1 frame
1 frame
U2RB register
MCU operation
User processing
ID1
ID2
DATA2
Detect the MPRB bit and
set the MPIE bit to 0.
A reception
Set the RI bit to 0.
A reception Set the RI bit to 0.
complete
complete
interrupt request
interrupt request
is generated. ^{Read data in}
If data matches own _{is generated. Read data in}
the U2RB register. station ID, continue
the U2RB register.
reception without any
setting changes.
Set the MPIE bit
to 1 again.
(b) When Data Matches Own Station ID
MPRB: Bit in U2RB register
MPIE: Bit in U2SMR5 register
Figure 25.21 Receive Operation Example during Multiprocessor Communication
(with 8-Bit Data/Multiprocessor Bit/One Stop Bit)
REJ09B0441-0010 Rev.0.10 Jul 30, 2008
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