R1EX24256ASAS0I_10 Datasheet, PDF (16/26 Pages) Renesas Technology Corp – Two-wire serial interface 256k EEPROM (32-kword × 8-bit)

R1EX24256AxxS0I
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 256kbit EEPROM receives 2 sequence 8-bit
memory address words.
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
Device
address
256k ^{1 0 1 0}
Start
1st Memory
address (n)
W
ACK
R/W
Note: 1. Don't care bit
2nd Memory
address (n)
Write data (n) ^{No ACK}
ACK
ACK
Stop
REJ03C0327-0100 Rev.1.00 Oct. 26, 2009
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