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MB85RC16
? Current Address Read
If the last write or read operation finishes correctly up to the end of stop condition, the memory address that
was accessed last remains in the memory address buffer (the length is 11 bits).
When sending this command without turning the power off, it is possible to read from the memory address
n+1 which adds 1 to the total 11-bit memory address n, which consists of the memory upper address 3-bit
from the device address word input and the lower 8-bit of the memory address buffer. If the memory address
n is the last address, it is possible to read with rolling over to the head of the memory address (000 H ). The
current address (address that the memory address buffer indicates) is undefined immediately after turning
the power on.
Access from master
Access from slave
(n+1) memory address
S Start Condition
S
1 0 1 0 A2 A1 A0 1 A
Read
Data 8b its
N P
P Stop Condition
A ACK (SDA is the "L"le v el)
N N ACK (SDA is the "H" le v el)
? Random Read
The one byte of data from the memory address as saved in the memory address buffer can be read out
synchronously to SCL by specifying the address in the same way as for a write, and then issuing another
start condition and sending the Device Address Word (R/W “1” input).
Setting values for the first and the second memory upper address codes should be the same.
The final NACK (SDA is the “H” level) is issued by the receiver that receives the data. In this case, this bit is
issued by the master side.
n address
S
1 0 1 0 A2 A1 A0 0 A
Address
Lo w 8b its
A S
1 0 1 0 A2 A1 A0 1 A
Read
Data 8b its
N P
(Input example) when reading
memory address 16F H :
001 B
01101111 B
001 B
Access from master
Access from slave
S Start Condition
P Stop Condition
A ACK (SDA is the "L" le v el)
N N ACK (SDA is the "H" le v el)
10
DS501-00001-2v0-E
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