©2013 Silicon Storage Technology, Inc.

DS20005054C

04/13

9

2 Mbit SPI Serial Flash

SST25VF020B

Data Sheet

Top-Sector Protection/Bottom-Sector Protection

The Top-Sector Protection (TSP) and Bottom-Sector Protection (BSP) bits independently indicate

whether the highest and lowest sector locations are Write locked or Write accessible. When TSP or

BSP is set to ‘1’, the respective sector is Write locked; when set to ‘0’ the respective sector is Write

accessible. If TSP or BSP is set to '1' and if the top or bottom sector is within the boundary of the target

address range of the program or erase instruction, the initiated instruction (Byte-Program, AAI-Word

Program, Sector-Erase, Block-Erase, and Chip-Erase) will not be executed. Upon power-up, the TSP

and BSP bits are automatically reset to ‘0’.