W25Q32JVTBIQ-TR Datasheet, PDF (16/76 Pages) Winbond – 3V 32M-BIT SERIAL FLASH MEMORY WITH DUAL, QUAD SPI

W25Q32JV
Status Register Protect (SRL)
The Status Register Lock bit (SRL) is a volatile/non-volatile read/write bit in the status register (S8). The
SRL bit controls the method of write protection to the Status Registers: temporary Power Lock-Down or
permanently One Time Program OTP.
SRL
0
1
Status Register Lock
Description
Non-Lock
Status Registers are unlocked.
Power Lock-Down
(Temporary/Volatile)
Status Registers are locked and cannot be written to
until the next power-down, power-up cycle to reset
SRL=0.
One Time Program⁽¹⁾
A special instruction flow can be used to permanently
(Permanently/Non-Volatile) ^{OTP lock the Status Registers.}
Note:1. Please contact Winbond for details regarding the special instruction sequence.
Suspend Status
(Status-Only)
Complement Protect
(Volatile/Non-Volatile Writable)
Security Register Lock Bits
(Volatile/Non-Volatile OTP Writable)
Reserved
Quad Enable
(Volatile/Non-Volatile Writable)
Status Register Lock
(Volatile/Non-Volatile Writable)
S15 S14 S13 S12 S11 S10 S9 S8
SUS CMP LB3 LB2 LB1 (R) QE SRL
Figure 4b. Status Register-2
Erase/Program Suspend Status (SUS) – Status Only
The Suspend Status bit is a read only bit in the status register (S15) that is set to 1 after executing a
Erase/Program Suspend (75h) instruction. The SUS status bit is cleared to 0 by Erase/Program Resume
(7Ah) instruction as well as a power-down, power-up cycle.
Security Register Lock Bits (LB3, LB2, LB1) – Volatile/Non-Volatile OTP Writable
The Security Register Lock Bits (LB3, LB2, LB1) are non-volatile One Time Program (OTP) bits in Status
Register (S13, S12, S11) that provide the write protect control and status to the Security Registers. The
default state of LB3-1 is 0, Security Registers are unlocked. LB3-1 can be set to 1 individually using the
Write Status Register instruction. LB3-1 are One Time Programmable (OTP), once it’s set to 1, the
corresponding 256-Byte Security Register will become read-only permanently.
- 15 -