W25Q32JVTBIQ-TR Datasheet, PDF (55/76 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).
/CS
CLK
DI
(IO0)
DO
(IO1)
Mode 3
0
Mode 0
* ^{= MSB}
123456789
29 30 31
Instruction (39h)
24-Bit Address
23 22
*
High Impedance
210
Mode 3
Mode 0
Figure 54. Individual Block Unlock Instruction
- 54 -
Publication Release Date: August 30, 2016
Revision C