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25LC010AT-E/MS Datasheet(PDF) 11 Page - Microchip Technology

Part # 25LC010AT-E/MS
Description  1K SPI Bus Serial EEPROM
PDF  28 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

25LC010AT-E/MS Datasheet(HTML) 11 Page - Microchip Technology

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© 2006 Microchip Technology Inc.
Preliminary
DS21832C-page 11
25AA010A/25LC010A
2.6
Write Status Register Instruction
(WRSR)
The Write Status Register instruction (WRSR) allows the
user to write to the nonvolatile bits in the STATUS reg-
ister as shown in Table 2-2. See Figure 2-7 for the
WRSR
timing sequence. Four levels of protection for the
array are selectable by writing to the appropriate bits in
the STATUS register. The user has the ability to write-
protect none, one, two or all four of the segments of the
array as shown in Table 2-3.
TABLE 2-3:
ARRAY PROTECTION
FIGURE 2-7:
WRITE STATUS REGISTER TIMING SEQUENCE (WRSR)
BP1
BP0
Array Addresses
Write-Protected
00
none
01
upper 1/4
(60h-7Fh)
10
upper 1/2
(40h-7Fh)
11
all
(00h-7Fh)
SO
SI
CS
9
1011
12131415
01
0
0
0
0
00
76
5
4
21
0
instruction
data to STATUS register
high-impedance
SCK
0
2
34
56
7
1
8
3
Note:
An internal write cycle (TWC) is initiated on the rising edge of CS after a valid write STATUS register
sequence.



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