FOR MOBILE APPLICATIONS
W25Q256FV
Publication Release Date: May 13, 2012
- 86 - Preliminary - Revision M1
8.2.48
Individual Block/Sector Lock (36h)
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, TB, BP[3:0] 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 lock a specific block or sector as illustrated in Figure 4d, an Individual Block/Sector Lock command
must be issued by driving /CS low, shifting the instruction code “36h” into the Data Input (DI) pin on the
rising edge of CLK, followed by a 24/32-bit address and then driving /CS high.
Figure 52a. Individual Block/Sector Lock Instruction (SPI Mode)
32-Bit Address is required when the device is operating in 4-Byte Address Mode
Figure 52b. Individual Block/Sector Lock Instruction (QPI Mode)
32-Bit Address is required when the device is operating in 4-Byte Address Mode
