R1EX24004AxxS0A
Write Operations (WP =Low )
Byte Write: (Write operation during WP =Low 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 words. Upon receipt of this memory address, the EEPROM outputs acknowledgment "0" and
receives a following 8-bit write data. After receipt of write data, the EEPROM outputs acknowledgment
"0". If the EEPROM receives a stop condition, the EEPROM enters an internally-timed write cycle and
terminates receipt of SCL, SDA inputs until completion of the write cycle. The EEPROM returns to a
standby mode after completion of the write cycle.
Byte Write Operation
WP
Device
Memory
address
address (n)
Write data (n)
4k
1010
W
Start
ACK
R/W
ACK
ACK
Stop
REJ03C0353-0101 Rev.1.01 Jan. 9, 2009
Page 12 of 22
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