W25Q32JVSFIQ-TR Datasheet, PDF (59/78 Pages) Winbond – 3V 32M-BIT SERIAL FLASH MEMORY WITH DUAL, QUAD SPI

W25Q32JV
Individual Block/Sector Unlock (39h)
The Individual Block/Sector Lock provides an alternative way to protect the memory array from adverse
Erase/Program. In order to use the Individual Block/Sector Locks, the WPS bit in Status Register-3 must
be set to 1. If WPS=0, the write protection will be determined by the combination of CMP, SEC, TB, BP[2:0]
bits in the Status Registers. The Individual Block/Sector Lock bits are volatile bits. The default values after
device power up or after a Reset are 1, so the entire memory array is being protected.
To unlock a specific block or sector as illustrated in Figure 4d, an Individual Block/Sector Unlock command
must be issued by driving /CS low, shifting the instruction code “39h” into the Data Input (DI) pin on the
rising edge of CLK, followed by a 24-bit address and then driving /CS high. A Write Enable instruction must
be executed before the device will accept the Individual Block/Sector Unlock Instruction (Status Register
bit WEL= 1).
Figure 54a. Individual Block Unlock Instruction (SPI Mode)
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Publication Release Date: November 18, 2014
Preliminary-Revision A1