R1EX24512ASAS0A Datasheet, PDF (12/23 Pages) Renesas Technology Corp – Two-wire serial interface 512k EEPROM (64-kword × 8-bit)

R1EX24512ASAS0A
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 EEPROMs receive 2 sequence 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
address
512k ^{1 0 1 0 0}
Start
1st Memory
address (n)
W
ACK
R/W
Note: 1. Don't care bit
2nd Memory
address (n)
Write data (n)
ACK
ACK
ACK _Stop
REJ03C0325-0100 Rev.1.00 May. 16, 2008
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