MB85RC16
■ I 2 C COMMUNICATION PROTOCOL
The I 2 C bus provides communication by two wires only, therefore, the SDA input should change while SCL
is the “L” level. However, when starting and stopping the communication sequence, SDA is allowed to change
while SCL is the “H” level.
? Start Condition
To start read or write operations by the I 2 C bus, change the SDA input from the “H” level to the “L” level while
the SCL input is in the “H” level.
? Stop Condition
To stop the I 2 C bus communication, change the SDA input from the “L” level to the “H” level while the SCL
input is in the “H” level. In the reading operation, inputting the stop condition finishes reading and enters the
standby state. In the writing operation, inputting the stop condition finishes inputting the rewrite data.
? Start Condition, Stop Condition
SCL
SDA
Start
Stop
Note : The FRAM device does not need the programming wait time (t WC ) after issuing the Stop Condition during
the write operation.
4
DS501-00001-2v0-E
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