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參數(shù)資料
| 型號： | X24640 |
| 英文描述： | 400KHz 2-Wire Serial E 2 PROM with Block Lock |
| 中文描述： | 400kHz的2線串行E的2座鎖胎膜早破 |
| 文件頁數(shù)： | 10/17頁 |
| 文件大?。?/td> | 85K |
| 代理商： | X24640 |
X24640
10
reset, nor can RWEL and WEL be reset in one write
operation. RWEL can be reset by writing 00000010 to
FFFFh; but this is the same operation as in step 3
described below, and will result in programing BL0,
BL1, and WPEN.
Writing to the BL and WPEN Bits
A 3 step sequence is required to change the nonvola-
tile Block Lock Protect or Write Protect Enable bits:
1)
Set WEL=1, Write 00000010 to address FFFFh
(Volatile Write Cycle.)
2)
Set RWEL=1, Write 00000110 to address FFFFh
(Volatile Write Cycle.)
3)
Set BL1, BL0, and/or WPEN bits, Write u00xy010 to
address FFFFh, where u=WPEN, x=BL1, and y=BL0.
(Nonvolatile Write Cycle.)
The three step sequence was created to make it diffi-
cult to change the contents of the Write Protect
Register accidentally. If WEL was set to one by a
previous register write operation, the user may start at
step 2. RWEL is reset to zero in step 3 so that user is
required to perform steps 2 and 3 to make another
change. RWEL must be 0 in step 3. If the RWEL bit in
the data byte for step 3 is a one, then no changes are
made to the Write Protect Register and the device
remains at step 2.
The WP pin must be LOW or the WPEN bit must be
LOW before a nonvolatile register write operation is
initiated. Otherwise, the write operation will abort and
the device will go into standby mode after the master
issues the stop condition in step 3.
Step 3 is a nonvolatile write operation, requiring t
WC
to
complete (acknowledge polling may be used to reduce
this time requirement). It should be noted that step 3
MUST end with a stop condition. If a start condition is
issued during or at the end of step 3 (instead of a stop
condition) the device will abort the nonvolatile register
write and remain at step 2. If the operation is aborted
with a start condition, the master must issue a stop to
put the device into standby mode.
Figure 11. Block Lock Protect Bits and Protected Addresses
7038 FRM T02
Figure 12. WP Pin and WPEN Bit Functionality
7038 FRM T03
BL1
BL0
Protected Addresses
Array Location
0
0
None
No Protect
0
1
1800h - 1FFFh
Upper 1/4
1
0
1000h - 1FFFh
Upper 1/2
1
1
0000h - 1FFFh
Full Array
WP
WPEN
Memory Array Not
Lock Block Protected
Memory Array Block
Lock Protected
Block Lock Bits
WPEN
Bit
0
X
1
X
0
1
Writable
Writable
Writable
Protected
Protected
Protected
Unprotected
Unprotected
Protected
Unprotected
Unprotected
Protected
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| X24640P | 400KHz 2-Wire Serial E 2 PROM with Block Lock |
| X24640P-1.8 | 400KHz 2-Wire Serial E 2 PROM with Block Lock |
| X24640PI | 400KHz 2-Wire Serial E 2 PROM with Block Lock |
| X24640PI-1.8 | 400KHz 2-Wire Serial E 2 PROM with Block Lock |
| X24640PI-2.5 | 400KHz 2-Wire Serial E 2 PROM with Block Lock |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| X24640P | 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:400KHz 2-Wire Serial E 2 PROM with Block Lock |
| X24640P-1.8 | 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:400KHz 2-Wire Serial E 2 PROM with Block Lock |
| X24640P-2.5 | 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:400KHz 2-Wire Serial E 2 PROM with Block Lock |
| X24640PI | 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:400KHz 2-Wire Serial E 2 PROM with Block Lock |
| X24640PI-1.8 | 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:400KHz 2-Wire Serial E 2 PROM with Block Lock |
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