SST25PF020B データシートの表示（PDF） - Microchip Technology

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SST25PF020B

2 Mbit 2.3-3.6V SPI Serial Flash

Microchip Technology 

4.4.5

BLOCK PROTECTION LOCK-DOWN

(BPL)

WP# pin driven low (VIL), enables the Block-Protection-

Lock-Down (BPL) bit. When BPL is set to 1, it prevents

any further alteration of the BPL, BP1, and BP0 bits of

the status register and BSP and TSP of Status Register

1. When the WP# pin is driven high (VIH), the BPL bit

has no effect and its value is “Don’t Care”. After power-

up, the BPL bit is reset to 0.

4.4.6

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-Pro-

gram, 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’.

SST25PF020B

 2013 Microchip Technology Inc.

DS20005135B-page 7

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