SST25VF080B datasheet(12/32 Pages) MICROCHIP

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SST25VF080B

DS20005045C-page 12

 2015 Microchip Technology Inc.

4.4.7

4-KBYTE 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 Sig-

nificant 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 exe-

cuted. 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 4-10

for the Sector-Erase sequence.

FIGURE 4-10:

SECTOR-ERASE SEQUENCE

CE#

SCK

ADD.

01 2 3 4 5 6 7 8

ADD.

HIGH IMPEDANCE

15 16

23 24

MODE 0

MODE 3

1296 SecErase.0

MSB

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