Fig. 12.22 Flowchart Of Master/Slave Mode Communications - Fujitsu MB90420/5 (A) Series Hardware Manual

UART
(Master CPU)
Start
Set operation mode to 1
Set the SIN pin to serial data input
Set 1-byte data (address data) that selects
the slave CPU to D0 to D7 to transmit (A/D = 1)
Set 0 to A/D
Reception enabled
Communicate with slave CPU
Communication
terminated?
NO
YES
Communicate
with the other
slave CPU
NO
YES
Reception disabled
END

Fig. 12.22 Flowchart of Master/Slave Mode Communications

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