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25LC320 Datasheet(PDF) 6 Page - Microchip Technology

No. de Pieza. 25LC320
Descripción  32K 2.5V SPI Bus Serial EEPROM
Descarga  12 Pages
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Fabricante  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
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25LC320 Datasheet(HTML) 6 Page - Microchip Technology

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25LC320
DS21158B-page 6
Preliminary
© 1996 Microchip Technology Inc.
FIGURE 2-1: WRITE TO STATUS REGISTER AND/OR ARRAY FLOWCHART
CS Returns High
Continue
WEL = 1?
WEL = 1?
WP is low?
WPEN = 1?
Write
Write to
Status Register
Do not write to
Status Register
Write to the
Unprotected Block
Do not write to
Array
No
No
No
No
Yes
Yes
Yes
Yes
No
Yes
No
Yes
To other
Commands
From other
Commands
Write
to Status
Reg?
to array?
2.3
Write Status Register (WRSR)
The WRSR instruction allows the user to select one of
four protection options for the array by writing to the
appropriate bits in the status register. The array is
divided up into four segments. The user has the ability
to write protect none, one, two, or all four of the seg-
ments of the array. The partitioning is controlled as illus-
trated in Table 2-3.
See Figure 3-6 for WRSR timing sequence.
TABLE 2-3:
ARRAY PROTECTION
BP1
BP0
Array Addresses
Write Protected
0
0
none
0
1
upper 1/4
0C00h - 0FFFh
1
0
upper 1/2
0800h - 0FFFh
1
1
all
0000h - 0FFFh


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