參數(shù)資料
型號： M24256-BFMB6TG/K
廠商： STMICROELECTRONICS
元件分類： PROM
英文描述： 32K X 8 I2C/2-WIRE SERIAL EEPROM, PDSO8
封裝： 2 X 3 MM, ROHS COMPLIANT, UFDFPN-8
文件頁數(shù)： 8/42頁
文件大?。?/td> 501K
代理商： M24256-BFMB6TG/K
Device operation
M24256-BF, M24256-BR, M24256-BW, M24256-DR
Doc ID 6757 Rev 21
3.6
Write operations
Following a Start condition the bus master sends a device select code with the Read/Write
bit (RW) reset to 0. The device acknowledges this, as shown in Figure 9, and waits for two
address bytes. The device responds to each address byte with an acknowledge bit, and
then waits for the data byte.
Writing to the memory may be inhibited if Write Control (WC) is driven High. Any Write
instruction with Write Control (WC) driven High (during a period of time from the Start
condition until the end of the two address bytes) will not modify the memory contents, and
the accompanying data bytes are not acknowledged, as shown in Figure 8.
Each data byte in the memory has a 16-bit (two byte wide) address. The most significant
byte (Table 4) is sent first, followed by the least significant byte (Table 5). Bits b15 to b0 form
the address of the byte in memory.
When the bus master generates a Stop condition immediately after the Ack bit (in the “10th
bit” time slot), either at the end of a Byte Write or a Page Write, the internal Write cycle is
triggered. A Stop condition at any other time slot does not trigger the internal Write cycle.
After the Stop condition, the delay tW, and the successful completion of a Write operation,
the device’s internal address counter is incremented automatically, to point to the next byte
address after the last one that was modified.
During the internal Write cycle, Serial Data (SDA) is disabled internally, and the device does
not respond to any requests.
3.7
Byte Write
After the device select code and the address bytes, the bus master sends one data byte. If
the addressed location is Write-protected, by Write Control (WC) being driven High, the
device replies with NoAck, and the location is not modified. If, instead, the addressed
location is not Write-protected, the device replies with Ack. The bus master terminates the
transfer by generating a Stop condition, as shown in Figure 9.
3.8
Page Write (memory array)
The Page Write mode allows up to 64 bytes to be written in a single Write cycle, provided
that they are all located in the same ‘row’ in the memory: that is, the most significant
memory address bits (b15-b6) are the same. If more bytes are sent than will fit up to the end
of the row, a condition known as ‘roll-over’ occurs. This should be avoided, as data starts to
become overwritten in an implementation dependent way.
The bus master sends from 1 to 64 bytes of data, each of which is acknowledged by the
device if Write Control (WC) is Low. If Write Control (WC) is High, the contents of the
addressed memory location are not modified, and each data byte is followed by a NoAck.
After each byte is transferred, the internal byte address counter (the 7 least significant
address bits only) is incremented. The transfer is terminated by the bus master generating a
Stop condition.
相關(guān)PDF資料
PDF描述
M24308/4-260 15 CONTACT(S), MALE, D SUBMINIATURE CONNECTOR
M24308/4-2 15 CONTACT(S), MALE, D SUBMINIATURE CONNECTOR
M24308/4-303 15 CONTACT(S), MALE, D SUBMINIATURE CONNECTOR
M24308/4-325 15 CONTACT(S), MALE, D SUBMINIATURE CONNECTOR
M24308/4-261 25 CONTACT(S), MALE, D SUBMINIATURE CONNECTOR
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M24256-BFMC6TG 功能描述:電可擦除可編程只讀存儲器 256kB Serial I2C 3-Chip Enable 1 MHz RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8
M24256-BHR 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:512 Kbit and 256 Kbit serial IC bus EEPROM with three Chip Enable lines
M24256-BHRDW6TP 功能描述:電可擦除可編程只讀存儲器 512 Kbit/256 Kbit serial 電可擦除可編程只讀存儲器 RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8
M24256-BHRMN6P 功能描述:電可擦除可編程只讀存儲器 512Kbit and 256Kbit bus 電可擦除可編程只讀存儲器 RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8
M24256-BHRMN6TP 功能描述:電可擦除可編程只讀存儲器 513 Kbit/256 Kbit serial 電可擦除可編程只讀存儲器 RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8
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