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Chapter 32 USART (LIN / FIFO)
7.USART Operation
7.7 LIN Communication Function
USART communication with LIN devices is available for both LIN master or LIN slave systems.
■ LIN-Master-Slave Communication Function
The settings shown in the figure below are required to operate USART in LIN communication mode (operation
mode 3).
Figure 7-13 Settings for USART
■ LIN device connection
As shown in the Figure below, a communication system of one LIN-Master device and a LIN-Slave device.
USART can operate both as LIN-Master or LIN-Slave.
Figure 7-14 Connection example of a small LIN-Bus system
7.8 Sample Flowcharts for USART in LIN Communication (Operation Mode 3)
This section contains sample flowcharts for USART in LIN communication.
bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
SCR04,SMR04 PEN P SBL CL AD CRE RXE TXE MD1 MD0 OTO EXT REST UPCL SCKE SOE
Mode 3 x x + + x 0 1 1 x 0 0 0 1
SSR04,
TDR04/RDR04
PE ORE FRE RDRF TDRE BDS RIE TIE
Set transmission data (during writing)
Retain reception data (during reading)
Mode 3 x +
ESCR04,ECCR
04
LBIE LBD LBL1 LBL0 SOPE SIOP CCO SECS - LBR MS SCDE SSM BIE RBI TBI
Mode 3 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 automatically set to the correct value
SOT
SIN
LIN-Master
Single-Wire-
Transceiver
LIN bus
SOT
SIN
Single-Wire-
Transceiver
LIN-Slave
