W25X16A Datasheet, PDF (14/48 Pages) Winbond – 16M-BIT SERIAL FLASH MEMORY WITH 4KB SECTORS AND DUAL OUTPUT SPI

W25X16A
12.1.5 Reserved Bits
Status register bit location S6 is reserved for future use. Current devices will read 0 for this bit
location. It is recommended to mask out the reserved bit when testing the Status Register. Doing this
will ensure compatibility with future devices.
12.1.6 Status Register Protect (SRP)
The Status Register Protect (SRP) bit is a non-volatile read/write bit in status register (S7) that can be
used in conjunction with the Write Protect (/WP) pin to disable writes to status register. When the SRP
bit is set to a 0 state (factory default) the /WP pin has no control over status register. When the SRP
pin is set to a 1, the Write Status Register instruction is locked out while the /WP pin is low. When the
/WP pin is high the Write Status Register instruction is allowed.
Figure 3. Status Register Bit Locations
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