AT25DF641_13 datasheet(40/56 Pages) ETC2

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AT25DF641

3680F–DFLASH–4/10

11.

Other Commands and Functions

11.1. 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 ex ecuted 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

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

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

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 ef fect on t he states of the Sector Protection Registers, the Sector Lockdown

Registers, 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. If a R eset operation is performed while a s ector is erase suspended, the

suspend operation will abort, and the contents of the block being erased in the suspended sector will be left in an

undefined state. If a Reset is performed while a sector is program suspended, the suspend operation will abort,

and the contents of the page that was being programmed and subsequently suspended will be undefined. The

remaining pages in the 64-Kbyte sector will retain their previous contents.

The complete opcode and confirmation byte must be clocked into the device before the

pin is deasserted, and

the

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

will be performed.

Figure 11-1.

Reset

SCK

MS B

OPCODE

CONFIR MATION BYTE IN

10 11

14 15

MS B

HIG H-IMP E DANC E

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