25lc020a Microchip Technology Inc., 25lc020a Datasheet - Page 11
25lc020a
Manufacturer Part Number
25lc020a
Description
2k Spi Bus Serial Eeprom
Manufacturer
Microchip Technology Inc.
Datasheet
1.25LC020A.pdf
(30 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
25lc020a-E/MC
Manufacturer:
MICROCHIP
Quantity:
12 000
Part Number:
25lc020a-E/P
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
Part Number:
25lc020a-E/SN
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
Part Number:
25lc020a-E/ST
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
Company:
Part Number:
25lc020a-I/P
Manufacturer:
MCP
Quantity:
10
Part Number:
25lc020a-I/P
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
Company:
Part Number:
25lc020a-I/SN
Manufacturer:
MCP
Quantity:
3 800
Company:
Part Number:
25lc020a-I/SN
Manufacturer:
MICROCHIP
Quantity:
12 000
Part Number:
25lc020a-I/SN
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
Company:
Part Number:
25lc020aT-E/OT
Manufacturer:
MICROCHIP
Quantity:
12 000
2.6
The Write Status Register instruction (WRSR) allows
the user to write to the nonvolatile bits in the STATUS
register 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.
FIGURE 2-7:
© 2007 Microchip Technology Inc.
SCK
Note:
CS
SO
SI
Write Status Register Instruction
(WRSR)
An internal write cycle (T
sequence.
0
0
0
WRITE STATUS REGISTER TIMING SEQUENCE (WRSR)
1
0
Instruction
2
0
3
WC
0
) is initiated on the rising edge of CS after a valid write STATUS register
4
0
5
High-Impedance
Preliminary
0
6
1
7
25AA020A/25LC020A
TABLE 2-3:
7
8
BP1
0
0
1
1
6
9
Data to STATUS register
10
5
11
4
ARRAY PROTECTION
BP0
0
1
0
1
12
3
13
2
Array Addresses
Write-Protected
(C0h-FFh)
(80h-FFh)
(00h-FFh)
14
upper 1/4
upper 1/2
1
DS21833D-page 11
none
all
15
0