Datasheet

 2010 Microchip Technology Inc. DS22123B-page 11
25AA02E48
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
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.
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
(C0h-FFh)
10
upper 1/2
(80h-FFh)
11
all
(00h-FFh)
SO
SI
CS
9101112131415
01000000
7654
210
Instruction Data to STATUS register
High-Impedance
SCK
0 2345671
8
3