Fujitsu MB91460 SERIES FR60 User Manual page 672

Chapter 32 USART (LIN / FIFO)
7.USART Operation
■ Master-slave Communication Function
The settings shown in figure
bit 15
SMR0
SCR04,
PEN
4
Mode 1 x
SSR04,
PE ORE FRE RDRF TDRE BDS RIE
TDR04/RDR04
Mode 1 x
Bit is used
x Bit is not used
0 / 1 Set bit to 0 / 1
■ Inter-CPU Connection
As shown in figure 7-11, a communication system consists of one master CPU and multiple slave CPUs
connected to two communication lines. USART can be used for the master or slave CPU.
Figure 7-11 Connection example of USART master-slave communication
Master CPU
■ Function Selection
Select the operation mode and data transfer mode for master-slave communication as shown in table 7-3.
656
7-10 are required to operate USART in multiprocessor mode (operation mode 1).
Figure 7-10 Settings for USART operation mode 1
14 13 12 11
P SBL CL AD
x
SIN
SOT
SIN
Slave CPU #1
10 9 8 7
CRE RXE TXE MD1 MD0 OTO EXT REST UPCL SCKE SOE
0 0
TIE
SOT SIN
Slave CPU #2
6 5 4 3
1 x 0 0
Set transmission data (during writing)
Retain reception data (during reading)
SOT
2 1 0
0 1