SST25WF080_12 datasheet(18/33 Pages) MICROCHIP

18 / 33 page

DS25024C

10/12

8 Mbit 1.8V SPI Serial Flash

SST25WF080

Not Recommended for New Designs

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 com-

mand sequence. The Sector-Erase instruction is initiated by executing an 8-bit command, 20H, fol-

lowed 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 register 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 operation, the Write-Enable

(WREN) instruction must be executed. CE# must remain active low for the duration of any command

sequence. The Block-Erase instruction is initiated 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 instruc-

tion is executed. Poll the Busy bit in the software status register or wait TBE for the completion of the inter-

nal self-timed Block-Erase. See Figure 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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