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R1EX24256BSAS0I Datasheet(PDF) 10 Page - Renesas Technology Corp

Part # R1EX24256BSAS0I
Description  Two-wire serial interface 256k EEPROM (32-kword8-bit)
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

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R1EX24256BSAS0I/R1EX24256BTAS0I
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
Device
address
1st Memory
address (n)
2nd Memory
address (n)
Write data (n)
256k
10 10
W
Stop
Start
ACK
ACK
ACK
R/W
Note:
1. Don't care bit
WP
No ACK
Note:
1. Don't care bit
Device
address
1st Memory
address (n)
2nd Memory
address (n)
Write data (n+m)
Write data (n)
256k
10 10
W
Stop
Start
ACK
ACK
ACK
R/W
WP
No ACK
No ACK
Page Write:
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
R10DS0007EJ0100 Rev.1.00
Page 10 of 16
Aug. 04, 2010


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