AT25DF081A datasheet(32/54 Pages) ETC2

32 / 54 page

8715C–SFLSH–1/2013

AT25DF081A

Notes: 1. Only bits 4 and 3 of Status Register Byte 2 will be modified when using the Write Status Register Byte 2 command.

2. R/W = Readable and writeable

R = Readable only

11.1.1 SPRL Bit

The SPRL bit is used to control whether the Sector Protection Registers can be modified or not. When the SPRL

bit is in the logical “1” state, all Sector Protection Registers are locked and cannot be modified with the Protect Sec-

tor and Unprotect Sector commands (the device will ignore these commands). In addition, the Global Protect and

Global Unprotect features cannot be performed. Any sectors that are presently protected will remain protected, and

any sectors that are presently unprotected will remain unprotected.

When the SPRL bit is in the logical “0” state, all Sector Protection Registers are unlocked and can be modified (the

Protect Sector and Unprotect Sector commands, as well as the Global Protect and Global Unprotect features, will

be processed as normal). The SPRL bit defaults to the logical “0” state after device power-up. The Reset command

has no effect on the SPRL bit.

The SPRL bit can be modified freely whenever the WP pin is deasserted. However, if the WP pin is asserted, then

the SPRL bit may only be changed from a logical “0” (Sector Protection Registers are unlocked) to a logical “1”

(Sector Protection Registers are locked). In order to reset the SPRL bit back to a logical “0” using the Write Status

The SPRL bit is the only bit of Status Register Byte 1 that can be user modified via the Write Status Register Byte

1 command.

11.1.2 EPE Bit

The EPE bit indicates whether the last erase or program operation completed successfully or not. If at least one

byte during the erase or program operation did not erase or program properly, then the EPE bit will be set to the

logical “1” state. The EPE bit will not be set if an erase or program operation aborts for any reason such as an

attempt to erase or program a protected region or a locked down sector or if the WEL bit is not set prior to an erase

or program operation. The EPE bit will be updated after every erase and program operation.

Table 11-2.

Status Register Format – Byte 2

Bit(1)

Name

Type(2)

Description

RES

Reserved for future use

RES

Reserved for future use

RES

Reserved for future use

RSTE

Reset Enabled

R/W

Reset command is disabled (default)

Reset command is enabled

SLE

Sector Lockdown Enabled

R/W

Sector Lockdown and Freeze Sector Lockdown State

commands are disabled (default)

Sector Lockdown and Freeze Sector Lockdown State

commands are enabled

RES

Reserved for future use

RES

Reserved for future use

RDY/BSY

Ready/Busy Status

Device is ready

Device is busy with an internal operation

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