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AT45DB321E Folha de dados(PDF) 35 Page - Renesas Technology Corp

Nome de Peças AT45DB321E
Descrição Electrónicos  32-Mbit DataFlash (with Extra 1-Mbits), 2.3 V Minimum SPI Serial Flash Memory
PDF  80 Pages
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Fabricante Electrônico  RENESAS [Renesas Technology Corp]
Página de início  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

AT45DB321E Folha de dados(HTML) 35 Page - Renesas Technology Corp

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DS-AT45DB321E-8784 Rev. N
Page 35
9/1/23
© 2023 Renesas Electronics
AT45DB321E Datasheet
8.1.2
Freeze Sector Lockdown
The Sector Lockdown command can be permanently disabled, and the current sector lockdown state can be
permanently frozen so that no additional sectors can be locked down aside from those already locked down. Any
attempts to issue the Sector Lockdown command after the Sector Lockdown State has been frozen are ignored.
To issue the Freeze Sector Lockdown command, the CS pin must be asserted and the opcode sequence of 34h,
55h, AAh, and 40h must be clocked into the device. Any additional data clocked into the device are ignored. When
the CS pin is deasserted, the current sector lockdown state is permanently frozen within a time of tLOCK. Also, the
SLE bit in the Status Register is permanently reset to a Logic 0 to indicate that the Sector Lockdown command is
permanently disabled.
Table 18. Freeze Sector Lockdown
Figure 13. Freeze Sector Lockdown
Command
Byte 1
Byte 2
Byte 3
Byte 4
Freeze Sector Lockdown
34h
55h
AAh
40h
34h
55h
AAh
40h
CS
SI
Each transition represents eight bits



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