MCP795W21 datasheet(35/54 Pages) MAS

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 2011 Microchip Technology Inc.

Preliminary

DS22280A-page 35

MCP795WXX/MCP795BXX

9.1.9

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:

ARRAY PROTECTION

FIGURE 9-6:

WRITE STATUS REGISTER TIMING SEQUENCE

BP1

BP0

Array Addresses

Write-Protected

(2 kbit shown)

none

upper 1/4

(C0h-FFh)

upper 1/2

(80h-FFh)

all

(00h-FFh)

1011

131415

Instruction

Data to STATUS Register

High-Impedance

SCK

23456

TWC

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