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參數(shù)資料
| 型號： | X25040VI |
| 英文描述： | SPI Serial EEPROM |
| 中文描述： | SPI串行EEPROM |
| 文件頁數(shù)： | 3/13頁 |
| 文件大?。?/td> | 128K |
| 代理商： | X25040VI |
X25040
Characteristics subject to change without notice.
3 of 13
REV 1.1 7/12/00
www.xicor.com
WRDI
0000 0100
Reset the write enable latch (disable write operations)
RDSR
0000 0101
Read status register
WRSR
0000 0001
Write status register
0000 A
8
011
Read data from memory array beginning at selected address
0000 A
8
010
Write data to memory array beginning at selected address (1 to 32 bytes)
FORNEWDESGNS
PRINCIPLES OF OPERATION
The X25040 is a 512 x 8 EEPROM designed to inter-
face directly with the synchronous serial peripheral
interface (SPI) of many popular microcontroller families.
The X25040 contains an 8-bit instruction register. It is
accessed via the SI input, with data being clocked in on
the rising SCK. CS must be LOW and the HOLD and
WP inputs must be HIGH during the entire operation.
Table 1 contains a list of the instructions and their
opcodes. All instructions, addresses and data are
transferred MSB first.
Data input is sampled on the first rising edge of SCK
after CS goes LOW. SCK is static, allowing the user to
stop the clock and then resume operations. If the clock
line is shared with other peripheral devices on the SPI
bus, the user can assert the HOLD input to place the
X25040 into a “PAUSE” condition. After releasing
HOLD, the X25040 will resume operation from the
point when HOLD was first asserted.
Write Enable Latch
The X25040 contains a “write enable” latch. This latch
must be SET before a write operation will be com-
pleted internally. The WREN instruction will set the
latch and the WRDI instruction will reset the latch. This
latch is automatically reset upon a power-up condition
and after the completion of a byte, page, or status reg-
ister write cycle.
Status Register
The RDSR instruction provides access to the status
register. The status register may be read at any time,
even during a write cycle. The status register is format-
ted as follows:
BP0 and BP1 are set by the WRSR instruction. WEL
and WIP are read-only and automatically set by other
operations.
The Write-In-Process (WIP) bit indicates whether the
X25040 is busy with a write operation. When set to a
“1”, a write is in progress, when set to a “0”, no write is
in progress. During a write, all other bits are set to “1”.
The Write Enable Latch (WEL) bit indicates the status
of the “write enable” latch. When set to a “1”, the latch
is set, when set to a “0”, the latch is reset.
The Block Protect (BP0 and BP1) bits are nonvolatile
and allow the user to select one of four levels of protec-
tion. The X25040 is divided into four 1024-bit segments.
One, two, or all four of the segments may be protected.
That is, the user may read the segments but will be
unable to alter (write) data within the selected seg-
ments. The partitioning is controlled as illustrated below.
7
0
6
0
5
0
4
0
3
2
1
0
BP1
BP0
WEL
WIP
Status Register Bits
BP1
0
0
1
1
Array Addresses Protected
None
$180–$1FF
$100–$1FF
$000–$1FF
BP0
0
1
0
1
Table 1. Instruction Set
Note:
*Instructions are shown MSB in leftmost position. Instructions are transferred MSB first.
Instruction Name Instruction Format*
WREN
Operation
0000 0110
Set the write enable latch (enable write operations)
READ
WRITE
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| X25040VI-2.7 | SPI Serial EEPROM |
| X25040VI-3 | 100V Single N-Channel HEXFET Power MOSFET in a TO-262 package; A IRFSL4410 with Standard Packaging |
| X25043P-3 | 100V Single N-Channel HEXFET Power MOSFET in a D2-Pak package; Similar to IRF3710S with Lead Free Packaging |
| X25043PI-3 | 100V Single N-Channel HEXFET Power MOSFET in a D2-Pak package; Similar to IRF3710STRL with Lead Free Packaging on Tape and Reel Left |
| X25043S-3 | 55V Single N-Channel HEXFET Power MOSFET in a TO-220 FullPak (Iso) package; A IRLI2505 with Standard Packaging |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| X25040VI-2.7 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:SPI Serial EEPROM |
| X25040VI-3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:SPI Serial EEPROM |
| X25041 | 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:SPI Serial E2PROM with Block LockTM Protection |
| X25041P | 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:SPI Serial E2PROM with Block LockTM Protection |
| X25041P-2.7 | 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:SPI Serial E2PROM with Block LockTM Protection |
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