11AA02UIDT-ISLASHTT datasheet(14/32 Pages) MICROCHIP

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11AA02UID

DS20005206A-page 14

 2013 Microchip Technology Inc.

4.6

Write Status Register (WRSR)

Instruction

The

WRSR instruction allows the user to select one of

four levels of protection 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 seg-

ments of the array. The partitioning is controlled as

illustrated in Table 4-3.

After transmitting the STATUS register data, the master

must transmit a NoMAK during the Acknowledge

sequence in order to initiate the internal write cycle.

TABLE 4-3:

ARRAY PROTECTION

FIGURE 4-7:

WRITE STATUS REGISTER COMMAND SEQUENCE

Note:

The

WRSR instruction must be terminated

with a NoMAK following the data byte. If a

NoMAK is not received at this point, the

command will be considered invalid, and

the device will go into Idle mode without

responding with a SAK or executing the

command.

BP1

BP0

Array Addresses

Write-Protected

none

upper 1/4

(C0h-FFh)

upper 1/2

(80h-FFh)

all

(00h-FFh)

Start Header

SCIO

Device Address

Command

Standby Pulse

SCIO

76 5 4

Status Register Data

32 1 0

Twc

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