MB85RC64
■ I 2 C COMMUNICATION PROTOCOL
The I 2 C bus is a two wire serial interface that uses a bidirectional data bus (SDA) and serial clock (SCL). A
data transfer can only be initiated by the bus master, which will also provide the serial clock for synchroni-
zation. The SDA signal should change while SCL is Low. However, as an exception, when starting and
stopping communication sequence, SDA is allowed to change while SCL is High.
? Start Condition
To start read or write operations by the I 2 C bus, set the SDA input from High to Low while the SCL input is
in High in order to start reading and writing.
? Stop Condition
Set the SDA input from Low to High while the SCL input is in High in order to terminate the I 2 C bus commu-
nication. Because the MB85RC64 does not need the writing wait time unlike E 2 PROM, it goes to the standby
state immediately after the stop condition input.
? Start Condition, Stop Condition
SCL
SDA
Start
Stop
Note : The FRAM device does not need the programming wait time like t WC after issuing the Stop Condition
such as.
4
DS05–13109–3E
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