AT45DB321E datasheet(35/80 Pages) RENESAS

部品番号	AT45DB321E

部品情報	32-Mbit DataFlash (with Extra 1-Mbits), 2.3 V Minimum SPI Serial Flash Memory

PDF	80 Pages

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メーカー	RENESAS [Renesas Technology Corp]

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DS-AT45DB321E-8784 Rev. N

Page 35

9/1/23

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

Each transition represents eight bits

AT45DB321E データシート(PDF) 35 Page - Renesas Technology Corp