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R1EX24004AxxS0A
Random Read:
This is a read operation with defined read address. A random read requires a dummy write to set read
address. The EEPROM receives a start condition, device address word (R/W=0) and memory address 8-
bit sequentially. The EEPROM outputs acknowledgment “0” after receiving memory address then enters
a current address read with receiving a start condition. The EEPROM outputs the read data of the address
which was defined in the dummy write operation. After receiving acknowledgment “1”(no
acknowledgment) and a following stop condition, the EEPROM stops the random read operation and
returns to a standby state.
Random Read Operation
Device
Memory
Device
address
address (n)
address
Read data (n)
4k
Start
1010
@@ 1*
W
ACK
R/W
1010
Start
ACK
# # 1*
R/W
ACK
R
No ACK
Stop
Dummy write
Current address read
Notes: 1. Don't care bit
2. 2nd device address code (#) should be same as 1st (@).
REJ03C0353-0101 Rev.1.01 Jan. 9, 2009
Page 18 of 22
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