MCP7952X/MCP7951X
9.1.7
WRITE STATUS REGISTER
(SRWRITE)
The Write Status Register (SRWRITE) instruction
allows the user to select one of four levels of protec-
tion 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 segments of the array.
The partitioning is controlled as shown in Table 9-2.
See Figure 9-6 for the SRWRITE timing sequence.
TABLE 9-2:
BP1
ARRAY PROTECTION
Array Addresses
BP0
Write-Protected
(2 kbit shown)
0
0
0
1
none
upper 1/4
(C0h-FFh)
1
1
0
1
upper 1/2
(80h-FFh)
all
(00h-FFh)
FIGURE 9-6:
WRITE STATUS REGISTER TIMING SEQUENCE
CS
TWC
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
15
0
SCK
SI
Instruction
Data to STATUS Register
7
6
5
4
3
2
0
0
0
0
0
0
0
1
High-Impedance
SO
DS22300A-page 32
Preliminary
2012 Microchip Technology Inc.
MAS [ MICRO ANALOG SYSTEMS ]
