AT45DB021E datasheet(39/70 Pages) RENESAS

39 / 70 page

DS-AT45DB021E-8789 Rev. L

Page 39

8/11/22

AT45DB021E Datasheet

15. Software Reset

In some applications, it can 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 Software Reset command allows a program or erase operation in progress to be ended abruptly and returns

the device to an idle state.

To perform a Software Reset, the CS pin must be asserted and a 4-byte command sequence of F0h, 00h, 00h,

and 00h must be clocked into the device. Any additional data clocked into the device after the last byte are

ignored. When the CS pin is deasserted, the program or erase operation currently in progress is terminated within

a time tSWRST. Since the program or erase operation might not complete before the device is reset, the contents of

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

The Software Reset command has no effect on the states of the Sector Protection Register, the Sector Lockdown

The complete 4-byte opcode must be clocked into the device before the CS pin is deasserted; otherwise, no reset

operation is performed.

Table 25. Software Reset

Figure 22. Software Reset

Command

Byte 1

Byte 2

Byte 3

Byte 4

Software Reset

F0h

00h

F0h

00h

Each transition represents eight bits

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