MX25L1673E Datasheet, PDF (43/65 Pages) Macronix International – 16M-BIT [x 1/x 2/x 4] CMOS MXSMIO® (SERIAL MULTI I/O) FLASH MEMORY

MX25L1673E
9-26. Write Security Register (WRSCUR)
The WRSCUR instruction is for changing the values of Security Register Bits. The WREN instruction is required be-
fore sending WRSCUR instruction. The WRSCUR instruction may change the values of bit1 (LDSO bit) for customer
to lock-down the Secured OTP area. Once the LDSO bit is set to "1", the Secured OTP area cannot be updated any
more.
The sequence of issuing WRSCUR instruction is :CS# goes low→ sending WRSCUR instruction → CS# goes high.
The SIO[3:1] are don't care when during this mode.
The CS# must go high exactly at the boundary; otherwise, the instruction will be rejected and not executed.
Figure 26. Write Security Register (WRSCUR) Sequence (Command 2F)
CS#
SCLK
SI
SO
01234567
Command
2F
High-Z
P/N: PM1912
REV. 1.2, JAN. 14, 2014
43