R1EX24256ASA00I Datasheet, PDF (12/22 Pages) Renesas Technology Corp – Two-wire serial interface 256k EEPROM (32-kword × 8-bit)

R1EX24256Axx00I
Write Operations
Byte Write:
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 128kbit and 256kbit 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
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)
ACK
ACK
Stop
REJ03C0326-0001 Rev.0.01 Jan. 10, 2008
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