AT25DF081A datasheet(37/53 Pages) ATMEL

37 / 53 page

8715B–SFLSH–8/10

Atmel AT25DF081A [Preliminary]

12.

Other Commands and Functions

12.1

Reset

In some applications, it may be necessary to prematurely terminate a program or erase cycle early rather than wait

the hundreds of microseconds or milliseconds necessary for the program or erase operation to complete normally.

The Reset command allows a program or erase operation in progress to be ended abruptly and returns the device

to an idle state. Since the need to reset the device is immediate, the Write Enable command does not need to be

issued prior to the Reset command being issued. Therefore, the Reset command operates independently of the

state of the WEL bit in the Status Register.

The Reset command can only be executed if the command has been enabled by setting the Reset Enabled

(RSTE) bit in the Status Register to a logical “1”. If the Reset command has not been enabled (the RSTE bit is in

the logical “0” state), then any attempts at executing the Reset command will be ignored.

To perform a Reset, the CS pin must first be asserted and the opcode of F0h must be clocked into the device. No

address bytes need to be clocked in, but a confirmation byte of D0h must be clocked into the device immediately

after the opcode. Any additional data clocked into the device after the confirmation byte will be ignored. When the

CS pin is deasserted, the program or erase operation currently in progress will be terminated within a time of t

RST.

Since the program or erase operation may not complete before the device is reset, the contents of the page being

programmed or the block being erased cannot be guaranteed to be valid.

The Reset command has no effect on the states of the Sector Protection Registers, the Sector Lockdown Regis-

ters, or the SPRL, RSTE, and SLE bits in the Status Register. The WEL, PS, and ES bits, however, will be reset

back to their default states.

The complete opcode and confirmation byte must be clocked into the device before the CS pin is deasserted, and

the CS pin must be deasserted on an even byte boundary (multiples of eight bits); otherwise, no Reset operation

will be performed.

Figure 12-1. Reset

SCK

MSB

1111000

OPCODE

CONFIRMATION BYTE IN

10 11

814 15

MSB

110100

HIGH-IMPEDANCE

AT25DF081A Datasheet(PDF) 37 Page - ATMEL Corporation