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AT25QL641 Datasheet(PDF) 67 Page - Renesas Technology Corp

Part # AT25QL641
Description  SPI Serial Flash Memory with Dual I/O, Quad I/O, QPI Support
PDF  80 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

AT25QL641 Datasheet(HTML) 67 Page - Renesas Technology Corp

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DS-AT25QL641-130 Rev. G
Page 67
Sep 14, 2022
© 2022 Renesas Electronics
AT25QL641 Datasheet
8.36 Enter Secured OTP (B1h)
The Enter Secured OTP command is for entering the additional 4-kbit secured OTP mode. This additional mode
is independent from the main array, which may be used to store unique serial number for system identifier. After
entering the Secured OTP mode, the standard read or program procedure can be used to read or write data. The
Secured OTP data cannot be updated again once it is locked down.
Please note that Write Status Register-1, Write Status Register-2 and Write Security Register commands are not
acceptable during the access of secure OTP region. Once security OTP is locked down, only commands related
with read are valid. The Enter Secured OTP command sequence is shown in Figure 60.
Figure 60. Enter Secured OTP Command for SPI Mode (left) and QPI Mode (right)
8.37 Exit Secured OTP (C1h)
The Exit Secured OTP command is for exiting the additional 4-kbit secured OTP mode. (See Figure 61.)
Figure 61. Exit Secured OTP command for SPI Mode (left) and QPI Mode (right)



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