AT25SL321 datasheet(66/82 Pages) DIALOG

No de pièce	AT25SL321

Description	32-Mbit, 1.7 V Minimum SPI Serial Flash Memory with Dual I/O, Quad I/O and QPI Support

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AT25SL321

DS-25SL321–112H–2020-10

8.37 Enter Secured OTP (B1h)

The Enter Secured OTP instruction is for entering the additional 4 kbit secured OTP mode. The additional 4 kbit

secured OTP is independent from main array, which can be used to store unique serial number for system

identifier. After entering the Secured OTP mode, and then follow standard read or program, procedure to read out

the data or update data. The Secured OTP data cannot be updated again once it is lock-down

Please note that Write Status Register-1, Write Status Register-2 and Write Security Register instructions are not

acceptable during the access of secure OTP region. Once security OTP is lock down, only commands related with

read are valid. The Enter Secured OTP instruction sequence is shown in Figure 8-59.

Figure 8-59. Enter Secured OTP Instruction for SPI Mode (left) and QPI Mode (right)

8.38 Exit Secured OTP (C1h)

The Exit Secured OTP instruction is for exiting the additional 4 kbit secured OTP mode. See

Figure 8-60.

Figure 8-60. Exit Secured OTP instruction for SPI Mode (left) and QPI Mode (right)

AT25SL321 Fiches technique(PDF) 66 Page - Dialog Semiconductor