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MB85RC16V
■ ACKNOWLEDGE (ACK)
In the I 2 C bus, serial data including memory address or memory information is sent in units of 8 bits. The
acknowledge signal indicates that every 8 bits of the data is successfully sent and received. The receiver
side usually outputs the “L” level every time on the 9th SCL clock after every 8 bits are successfully trans-
mitted. On the transmitter side, the bus is temporarily released on this 9th clock to allow the acknowledge
signal to be received and checked. During this released period, the receiver side pulls the SDA line down to
indicate that the communication works correctly.
If the receiver side receives the stop condition before transmitting the acknowledge “L” level, the read
operation ends and the I 2 C bus enters the standby state. If the acknowledge “L” level is not detected, and
the Stop condition is not sent, the bus remains in the released state without doing anything.
? Acknowledge timing overview diagram
SCL
1
2
3
8
9
SDA
Start
The transmitter side should always release SDA on the 9th bit.
At this time, the receiver side outputs a pull-down if the
ACK
receive of the previous 8 bit works correctly (ACK response).
■ MEMORY ADDRESS STRUCTURE
The MB85RC16V has the memory address buffer to store the 11-bit information for the memory address.
As for byte write, page write and random read commands, the complete 11-bit memory address is configured
by inputting the memory upper address (3 bits) and the memory lower address (8 bits), and saving to the
memory address buffer and access to the memory is performed.
As for a current address read command, the complete 11-bit memory address is configured by inputting the
memory upper address (3 bits) and by the memory address lower 8-bit which has saved in the memory
address buffer, and saving to the memory address buffer and access to the memory is performed.
DS501-00010-2v0-E
5
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