FUJITSU MB91460 SERIES FR60 User Manual
Page 672
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Chapter 32 USART (LIN / FIFO)
7.USART Operation
■
Master-slave Communication Function
The settings shown in figure
are required to operate USART in multiprocessor mode (operation mode 1).
Figure 7-10 Settings for USART operation mode 1
■
Inter-CPU Connection
As shown in figure
, 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
■
Function Selection
Select the operation mode and data transfer mode for master-slave communication as shown in table
.
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 1
x
x
0
0
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 1
x
Bit is used
x Bit is not used
0 / 1 Set bit to 0 / 1
Master CPU
SIN
SIN
SOT
SOT
SIN
SOT
Slave CPU #2
Slave CPU #1