AT25DF641A datasheet(37/57 Pages) ATMEL

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8693A–DFLASH–8/10

Atmel AT25DF641A [Preliminary]

11.1.6

RSTE Bit

The RSTE bit is used to enable or disable the Reset command. When the RSTE bit is in the log-

ical “0” state (the default state after power-up), the Reset command is disabled and any attempts

to reset the device using the Reset command will be ignored. When the RSTE bit is in the logical

“1” state, the Reset command is enabled.

The RSTE bit will retain its state as long as power is applied to the device. Once set to the logi-

cal “1” state, the RSTE bit will remain in that state until it is modified using the Write Status

will not change the state of the RSTE bit.

11.1.7

SLE Bit

The SLE bit is used to enable and disable the Sector Lockdown and Freeze Sector Lockdown

State commands. When the SLE bit is in the logical “0” state (the default state after power-up),

the Sector Lockdown and Freeze Sector Lockdown commands are disabled. If the Sector Lock-

down and Freeze Sector Lockdown commands are disabled, then any attempts to issue the

commands will be ignored. This provides a safeguard for these commands against accidental or

erroneous execution. When the SLE bit is in the logical “1” state, the Sector Lockdown and

Freeze Sector Lockdown State commands are enabled.

Unlike the WEL bit, the SLE bit does not automatically reset after certain device operations.

Therefore, once set, the SLE bit will remain in the logical “1” state until it is modified using the

Write Status Register Byte 2 command or until the device has been power cycled. The Reset

command has no effect on the SLE bit.

If the Freeze Sector Lockdown State command has been issued, then the SLE bit will be perma-

nently reset in the logical “0” state to indicate that the Sector Lockdown command has been

disabled.

11.1.8

PS Bit

The PS bit indicates whether or not a sector is in the Program Suspend state.

11.1.9

ES Bit

The ES bit indicates whether or not a sector is in the Erase Suspend state.

11.1.10

RDY/BSY Bit

The RDY/BSY bit is used to determine whether or not an internal operation, such as a program

or erase, is in progress. To poll the RDY/BSY bit to detect the completion of a program or erase

cycle, new Status Register data must be continually clocked out of the device until the state of

the RDY/BSY bit changes from a logical “1” to a logical “0”.

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