SST25WF080 datasheet(14/29 Pages) SST

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Advance Information

8Mbit 1.8V SPI Serial Flash

SST25WF080

S71203-03-000

04/10

Sector-Erase

The Sector-Erase instruction clears all bits in the selected 4

KByte sector to FFH. A Sector-Erase instruction applied to

a protected memory area will be ignored. Prior to any Write

operation, the Write-Enable (WREN) instruction must be

executed. CE# must remain active low for the duration of

any command sequence. The Sector-Erase instruction is

initiated by executing an 8-bit command, 20H, followed by

address bits [A23-A0]. Address bits [AMS-A12] (AMS =Most

Significant address) are used to determine the sector

address (SAX), remaining address bits can be VIL or VIH.

CE# must be driven high before the instruction is executed.

The user may poll the Busy bit in the software status regis-

ter or wait TSE for the completion of the internal self-timed

Sector-Erase cycle. See Figure 14 for the Sector-Erase

sequence.

FIGURE 14: Sector-Erase Sequence

32-KByte Block-Erase

The Block-Erase instruction clears all bits in the selected 32

KByte block to FFH. A Block-Erase instruction applied to a

protected memory area is ignored. Prior to any Write oper-

ation, the Write-Enable (WREN) instruction must be exe-

cuted. CE# must remain active low for the duration of any

command sequence. The Block-Erase instruction is initi-

ated by executing an 8-bit command, 52H, followed by

address bits [A23-A0]. Address bits [AMS-A15] (AMS =Most

Significant Address) are used to determine block address

(BAX), remaining address bits can be VIL or VIH. CE# must

be driven high before the instruction is executed. Poll the

Busy bit in the software status register or wait TBE for the

completion of the internal self-timed Block-Erase. See Fig-

ure 15 for the Block-Erase sequences.

FIGURE 15: 32-KByte Block-Erase Sequence

CE#

SCK

ADD.

01 2 3 4 5 6 7 8

ADD.

HIGH IMPEDANCE

15 16

23 24

MODE 0

MODE 3

1203 F13.0

MSB

CE#

SCK

ADDR

01 2 3 4 5 6 7 8

ADDR

HIGH IMPEDANCE

15 16

23 24

MODE 0

MODE 3

1203 F14.0

MSB

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