R1EX24512ASAS0A Datasheet, PDF (18/23 Pages) Renesas Technology Corp – Two-wire serial interface 512k EEPROM (64-kword × 8-bit)

R1EX24512ASAS0A
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 2 ×
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
512k
Start
Device
address
@@
1 0 1 00 W
1st Memory
address (n)
ACK
R/W
Dummy write
2nd Memory
address (n)
ACK
Device
address
##
1 0 1 00 R
Start ^R/W
ACK
ACK
Read data (n)
No ACK
Stop
Currect address read
Notes: 1. 2nd device address code (#) should be same as 1st (@).
2. Don't care bit
REJ03C0325-0100 Rev.1.00 May. 16, 2008
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