Fujitsu MB90480 Series Hardware Manual page 457

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Function selection
Table 19.5-5 lists settings for selecting the communication method in master/slave
communication.
Table 19.5-5 Function selection in master/slave communication
Sending and receiving
the addresses
Sending and receiving
the data
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Communication procedure of master/slave communication function
Communication starts when the master CPU sends address data. Address data is data for
which the A/D bit is "1"; the address is used to select the slave CPU that becomes the
communication destination. Each slave CPU interprets the address data by a program. If the
address data matches the address assigned to the system, communication (transfer of ordinary
data) with the master CPU is established.
Figure 19.5-11 shows the procedure for communication using the master/slave communication
function.
Operation mode
Master Slave
CPU CPU
A/D = 1 + 8-bit address
Mode 1 -
A/D = 0 + 8-bit address
Data Parity
None
CHAPTER 19 UART
Synchronous
Stop bit
operation
1 or 2
Asynchronous
bits
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