MCP795W22T-I/SL View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

MCP795W22T-I/SL

2Kb EE 64B SRAM WD TED ID

Microchip Technology 

MCP795W1X/MCP795W2X

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:

BP1

0

0

1

1

ARRAY PROTECTION

Array Addresses

BP0

Write-Protected

(2 kbit shown)

0

none

1

upper 1/4

(C0h-FFh)

0

upper 1/2

(80h-FFh)

1

all

(00h-FFh)

FIGURE 9-6:

WRITE STATUS REGISTER TIMING SEQUENCE

CS

SCK

SI

TWC

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Instruction

Data to STATUS Register

0 00 00 0 01 7 6 54 3 2 10

High-Impedance

SO

 2011-2012 Microchip Technology Inc.

Preliminary

DS22280C-page 35

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