R1EX24004ASAS0I Datasheet, PDF (14/24 Pages) Renesas Technology Corp – Two-wire serial interface 4k EEPROM (512-word × 8-bit)

R1EX24004AxxS0I
Write Operations(WP=High)
Byte Write: (Write operation during WP=High status)
A write operation requires an 8-bit device address word with R/W = “0”. Then the EEPROM sends
acknowledgment "0" at the ninth clock cycle. After these, the 4k bit EEPROM receives 8-bit memory
address. Upon receipt of this memory address, the EEPROM outputs acknowledgment "0". After receipt
of 8-bit write data, the EEPROM outputs acknowledgment "1"(NO ACK). Then the EEPROM write
operations are not allowed.
Byte Write Operation
WP
4k
Start
Device
address
1010
Memory
address (n)
Write data (n)
W
ACK
R/W
ACK
No ACK
Stop
REJ03C0356-0001 Rev.0.01 Jan. 11, 2008
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