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AT45DB321E Fiches technique(PDF) 37 Page - Renesas Technology Corp

No de pièce AT45DB321E
Description  32-Mbit DataFlash (with Extra 1-Mbits), 2.3 V Minimum SPI Serial Flash Memory
PDF  80 Pages
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Fabricant  RENESAS [Renesas Technology Corp]
Site Internet  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

AT45DB321E Fiches technique(HTML) 37 Page - Renesas Technology Corp

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DS-AT45DB321E-8784 Rev. N
Page 37
9/1/23
© 2023 Renesas Electronics
AT45DB321E Datasheet
8.2.2
Reading the Security Register
To read the Security Register, an opcode of 77h and three dummy bytes must be clocked into the device. After the
last dummy bit has been clocked in, the contents of the Security Register can be clocked out on the SO pin. After
the last byte of the Security Register has been read, additional pulses on the SCK pin results in undefined data
being output on the SO pin.
Deasserting the CS pin terminates the Read Security Register operation and put the SO pin into a high-
impedance state.
Figure 15. Read Security Register
77h
XX
XX
XX
Data
n
Data
n + 1
CS
Data
n + x
SI
SO
Each transition represents eight bits



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