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MB90420/5 (A) SERIES F
• Selection of function
For master/slave mode communication, select the operation mode and the data transfer mode, as shown
in Table 12-16.
Table 12-16 Selection of Master/Slave Mode Communication Function
Address
transmission/reception
Data
transmission/reception
• Communication procedure
Communications start when the master CPU transmits the address data. The address data, which A/D bit
is 1, selects the slave CPU which is a communication destination. Each slave CPU determines the
address data by the program, and when the slave CPU matches the allocated address, it communicates
with the master CPU.
Figure 12.22 shows the flowchart of the master/slave mode communications (multiprocessor mode).
2
MC-16LX FAMILY 16-BIT MICROCONTROLLERS HARDWARE MANUAL
Operation Mode
Master
Slave CPU
CPU
Mode 1
—
Data
Parity
A/D = "1"
+
8-bit address
Not provided
A/D = "0"
+
8-bit data
12-36
Synchronous/
Stop bit
asynchronous
1 bit
Asynchronous
or
2 bits
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