AT25DF321A datasheet(33/53 Pages) ETC2

33 / 53 page

3686F–DFLASH–1/2014

AT25DF321A

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 Lockdown 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 permanently 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”.

Figure 11-1.Read Status Register

SCK

MSB

00000101

410 11

812

21 22

15 16

13 14

23 24

28 29

OPCODE

MSB

DDDDDD

MSB

DDDDD

STATUS REGISTER

BYTE 1

STATUS REGISTER

BYTE 1

STATUS REGISTER

BYTE 2

HIGH-IMPEDANCE

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