R1EV24004ASAS0I_15 Datasheet, PDF (10/17 Pages) Renesas Technology Corp – Two-wire serial interface 4k EEPROM (512-word  8-bit)

R1EV24004ASAS0I
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
Page Write: (Write operation during WP=High status)
The page write is the same sequence as the byte write. The page write is initiated by a start condition, device address
word and memory address(n) with every ninth bit acknowledgment"0". But after inputting write data(Dn) , the
EEPROM outputs acknowledgment "1"(NO ACK). Then the EEPROM write operations are not allowed.
Page Write Operation
WP
4k
Start
Device
address
1010
Memory
address (n)
W
ACK
R/W
No ACK
No ACK
Write data (n) Write data (n+m)
ACK
Stop
R10DS0123EJ0100 Rev.1.00
Apr. 08, 2013
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