25AA640-ESLASHP datasheet(12/24 Pages) MICROCHIP

12 / 24 page

25AA640/25LC640

DS21223G-page 12

 2004 Microchip Technology Inc.

3.7

Data Protection

The following protection has been implemented to

prevent inadvertent writes to the array:

• The write enable latch is reset on power-up

• A write enable instruction must be issued to set

the write enable latch

• After a byte write, page write, or Status register

write, the write enable latch is reset

•CS must be set high after the proper number of

clock cycles to start an internal write cycle

• Access to the array during an internal write cycle

is ignored and programming is continued

3.8

Power-On-State

The 25XX640 powers on in the following state:

• The device is in low-power Standby mode

(CS = 1)

• The write enable latch is reset

• SO is in high-impedance state

• A high-to-low transition on CS is required to enter

the active state

TABLE 3-3:

WRITE-PROTECT FUNCTIONALITY MATRIX

WPEN

WEL

Protected Blocks

Unprotected Blocks

Status Register

Protected

Writable

Low

Protected

Writable

Protected

High

Protected

Writable

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