R1EX24004ASAS0A_15 Datasheet, PDF (20/26 Pages) Renesas Technology Corp – Two-wire serial interface 4k EEPROM (512-word × 8-bit)

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
4k
Start
Device
address
@@1*
1010
W
Memory
address (n)
ACK
R/W
Dummy write
Device
address
# # _1*
1010
R
Start ^R/W
ACK
ACK
Read data (n)
No ACK
Stop
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
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