Filter
Top Products
655
Chapter 32 USART (LIN / FIFO)
7.USART Operation
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 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
■ 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
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.
bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
SCR04,SMR0
4
PEN P SBL CL AD CRE RXE TXE MD1 MD0 OTO EXT REST UPCL SCKE SOE
Mode 0 x 0 0 0 x 0 0 0
Mode 2 x x 0 1 0 0 0
SSR04,
TDR04/RDR04
PE ORE FRE RDRF TDRE BDS RIE TIE
Set transmission data (during writing)
Retain reception data (during reading)
Mode 0
Mode 2
ESCR04,ECCR
04
LBIE LBD LBL1 LBL0 SOPE SIOP CCO SECS - LBR MS SCDE SSM BIE RBI TBI
Mode 0 x x x x x x x x x x x x x x x
Mode 2 x x x x x x x x x 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)
SOT
SIN
SCK
SOT
SIN
SCK
CPU-1 (Master) CPU-2 (Slave)
Output
Input