AT25DF161 datasheet(37/60 Pages) ATMEL

37 / 60 page

3687C–DFLASH–7/09

AT25DF161 [Preliminary]

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 can-

not 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 per-

formed. 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 Pro-

tect 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 Regis-

ters 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 Register Byte 1 command, the WP 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 Sta-

tus 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 pro-

Table 11-2.

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.

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