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Chapter 32 USART (LIN / FIFO)
7.USART Operation
Table 7-3 Selection of the master-slave communication function
■ Communication Procedure
When the master CPU transmits address data, communication starts. The A/D bit in the address data is set to
1, and the communication destination slave CPU is selected. Each slave CPU checks the address data using
a program. When the address data indicates the address assigned to a slave CPU, the slave CPU
communicates with the master CPU (ordinary data). Figure 7-12 shows a flowchart of master-slave
communication (multiprocessor mode)
Operation mode
Data Parity
Synchro-
nization
method
Stop bit
Bit
directionMaster
CPU
Slave CPU
Address
transmis-
sion and
reception
Mode 1
(send AD-
bit)
Mode 1
(receive
AD-bit)
AD="1" +
7- or 8-bit
address
None
Asyn-
chronous
1 or 2
bits
LSB
or
MSB
first
Data trans-
mission
and recep-
tion
AD="0" +
7- or 8-bit
data