AT25DF641_13 datasheet(35/56 Pages) ETC2

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AT25DF641

3680F–DFLASH–4/10

Table 10-2.

Status Register Format – Byte 2

Bit(1)

Name

Type(2)

Description

RES

Reserved for future use

Reserved for future use.

RES

Reserved for future use

Reserved for future use.

RES

Reserved for future use

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.

Program Suspend Status

No sectors are program suspended (default).

A sector is program suspended.

Erase Suspend Status

No sectors are erase suspended (default).

A sector is erase suspended.

RDY/BSY Ready/Busy Status

Device is ready.

Device is busy with an internal operation.

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

10.1.1. 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

Sector 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

pin is deasserted. However, if the

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

pin will have to first be deasserted.

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.

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