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7.5 Bidirectional Communication Function (Normal Mode)
In operation mode 0 or 2, normal serial bidirectional communication is available. Select operation mode 0 for
asynchronous communication and operation mode 2 for synchronous communication.
■ Bidirectional Communication Function
The settings shown in figure
bit
15
SMR0
SCR04,
PEN
4
Mode 0
Mode 2
SSR04,
PE ORE FRE RDRF TDRE BDS RIE
TDR04/RDR04
Mode 0
Mode 2
ESCR04,ECCR
LBIE LBD LBL1 LBL0 SOPE SIOP CCO SECS
04
Mode 0
x
Mode 2
x
Bit is used
x Bit is not used
0 / 1 Set bit to 0 / 1
Bit is used if SSM = 1 (Synchronous start-/stop-bit mode)
■ Inter-CPU Connection
As shown in figure 7-9, interconnect two CPUs in USART mode 2
Figure 7-9 Connection example of USART mode 2 bidirectional communication
CPU-1 (Master)
7.6 Master-Slave Communication Function (Multiprocessor Mode)
USART communication with multiple CPUs connected in master-slave mode is available for both master or
slave systems.
7-8
are required to operate USART in normal mode (operation mode 0 or 2).
Figure 7-8 Settings for USART operation mode 0 and 2
14
13
12
11
P
SBL
CL
AD
x
x
x
x
x
x
x
x
x
x
x
SOT
SIN
Output
SCK
10
9
8
7
CRE RXE TXE MD1 MD0 OTO EXT REST UPCL SCKE SOE
0
0
0
1
TIE
-
x
x
x
x
Input
Chapter 32 USART (LIN / FIFO)
6
5
4
3
0
x
0
0
0
0
Set transmission data (during writing)
Retain reception data (during reading)
LBR MS SCDE SSM
x
x
x
x
x
SOT
SIN
SCK
CPU-2 (Slave)
7.USART Operation
2
1
0
0
0
BIE
RBI
TBI
x
x
x
x
x
x
655
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