BOOT SECTOR FLASH
Austin Semiconductor, Inc.
TEMPORARY SECTOR UNPROTECT
This feature allows temporary unprotection of previously protected sectors to change data in-system. The Sector
Unprotect mode is activated by setting the RESET# pin to VID. During this mode, formerly protected sectors can be
programmed or erased by selecting the sector addresses. Once VID is removed from the RESET# pin, all the previously
protected sectors are protected again. Figure 1 shows the algorithm, and Figure 21, on page 35 shows the timing
diagrams, for this feature.
RESET# = VID
Perform Erase or
RESET# = VIH
1. All protected sectors unprotected.
2. All previously protected sectors are protected once
Figure 1. Temporary Sector Unprotect Operation
Rev. 0.0 02/09
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