11AA02UIDT-ISLASHSN datasheet(12/32 Pages) MICROCHIP

12 / 32 page

11AA02UID

DS20005206A-page 12

 2013 Microchip Technology Inc.

4.4

Write Enable (WREN) and Write

Disable (WRDI) Instructions

The 11AA02UID contains a write enable latch. See

Table 6-1 for the Write-Protect Functionality Matrix.

This latch must be set before any write operation will be

completed internally. The

WREN instruction will set the

latch, and the

WRDI instruction will reset the latch.

The following is a list of conditions under which the

write enable latch will be reset:

• Power-up

•

WRDI instruction successfully executed

•

WRSR instruction successfully executed

•

WRITE instruction successfully executed

•

ERAL instruction successfully executed

•

SETAL instruction successfully executed

FIGURE 4-4:

WRITE ENABLE COMMAND SEQUENCE

FIGURE 4-5:

WRITE DISABLE COMMAND SEQUENCE

Note:

The

WREN and WRDI instructions must be

terminated with a NoMAK following the

command 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.

Start Header

SCIO

Device Address

Command

Standby Pulse

SCIO

Start Header

SCIO

Device Address

Command

Standby Pulse

SCIO

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