SST25VF020B_11 Datasheet, PDF (17/35 Pages) Microchip Technology – 2 Mbit SPI Serial Flash

A Microchip Technology Company
2 Mbit SPI Serial Flash
SST25VF020B
Data Sheet
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 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 [A_MS-A₁₂] (A_MS = Most Significant address) are used to
determine the sector address (SA_X), remaining address bits can be V_IL or V_IH. CE# must be driven high
before the instruction is executed. The user may poll the Busy bit in the software status register or wait
T_SE for the completion of the internal self-timed Sector-Erase cycle. See Figure 12 for the Sector-
Erase sequence.
CE#
MODE 3
SCK ^{MODE 0}
0 1 2345 6 78
15 16
23 24 31
SI
20
ADD. ADD. ADD.
MSB
MSB
SO
HIGH IMPEDANCE
1417 SecErase.0
Figure 12:Sector-Erase Sequence
©2011 Silicon Storage Technology, Inc.
17
S71417-03-000
02/11