SST25WF080B datasheet(14/39 Pages) MICROCHIP

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SST25WF080B

DS20005164C-page 14

 2014 Microchip Technology Inc.

5.6

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 or D7H, followed by

address bits [A23-A0]. Address bits [AMS-A12]

(AMS = Most Significant address) are used to deter-

mine the sector address (SAX), remaining address bits

can be VIL or VIH. CE# must be driven high before the

instruction is executed. Poll the BUSY bit in the Soft-

ware Status register, or wait TSE, for the completion of

the internal self-timed Sector-Erase cycle. See Figure

5-6 for the Sector-Erase sequence and Figure 6-9 for

the flow chart.

FIGURE 5-6:

SECTOR-ERASE SEQUENCE

5.7

64-KByte Block-Erase

The 64-KByte Block-Erase instruction clears all bits in

the selected 64 KByte block to FFH. Applying this

instruction to a protected memory area results in the

instruction being 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.

Initiate the 64-Byte Block-Erase instruction by execut-

ing an 8-bit command, D8H, followed by address bits

[A23-A0]. Address bits [AMS-A16] (AMS = Most Signifi-

cant Address) determine the block address (BAX),

remaining address bits can be VIL or VIH. CE# must be

driven high before executing the instruction. Poll the Busy bit

in the software status register or wait TBE for the com-

pletion of the internal self-timed Block-Erase cycle. See

Figure 5-7 for the 64-KByte Block-Erase sequences

and Figure 6-9 for the flow chart.

FIGURE 5-7:

64-KBYTE BLOCK-ERASE SEQUENCE

CE#

SCK

ADD.

01 2 3 4 5 6 7 8

ADD.

20 or D7

HIGH IMPEDANCE

15 16

23 24

MODE 0

MODE 3

25164 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

25164 F15.0

MSB

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