AT25DF321A datasheet(35/53 Pages) ETC2

35 / 53 page

3686F–DFLASH–1/2014

AT25DF321A

11.3

Write Status Register Byte 2

The Write Status Register Byte 2 command is used to modify the RSTE and SLE bits of the Status Register. Using the Write

Status Register Byte 2 command is the only way to modify the RSTE and SLE bits in the Status Register during normal device

operation, and the SLE bit can only be modified if the sector lockdown state has not been frozen. Before the Write Status

the Status Register to a logical “1”.

To issue the Write Status Register Byte 2 command, the CS pin must first be asserted and the opcode of 31h must be clocked

into the device followed by one byte of data. The one byte of data consists of three don’t care bits, the RSTE bit value, the SLE

bit value, and three additional don’t care bits (see Table 11-4). Any additional data bytes that are sent to the device will be

ignored. When the CS pin is deasserted, the RSTE and SLE bits in the Status Register will be modified, and the WEL bit in the

Status Register will be reset back to a logical “0”. The SLE bit will only be modified if the Freeze Sector Lockdown State

command has not been previously issued.

The complete one byte of data must be clocked into the device before the CS pin is deasserted, and the CS pin must be

deasserted on even byte boundaries (multiples of eight bits); otherwise, the device will abort the operation, the state of the

RSTE and SLE bits will not change, and the WEL bit in the Status Register will be reset back to the logical “0” state.

Figure 11-3.Write Status Register Byte 2

Table 11-4.

Write Status Register Byte 2 Format

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

XXX

RSTE

SLE

XXX

SCK

MSB

0011000

OPCODE

10 11

814 15

MSB

XXX

STATUS REGISTER IN

BYTE 2

HIGH-IMPEDANCE

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