AT45DB641E datasheet(28/78 Pages) RENESAS

28 / 78 page

DS-AT45DB641E-027 Rev. O

Page 28

6/30/23

AT45DB641E Datasheet

8.1.1

Enable Sector Protection

Sectors specified for protection in the Sector Protection Register can be protected from program and erase

operations by issuing the Enable Sector Protection command. To enable the sector protection, a 4-byte command

sequence of 3Dh, 2Ah, 7Fh, and A9h must be clocked into the device. After the last bit of the opcode sequence

has been clocked in, the CS pin must be deasserted to enable the Sector Protection.

Figure 5. Enable Sector Protection

8.1.2

Disable Sector Protection

To disable the sector protection, a 4-byte command sequence of 3Dh, 2Ah, 7Fh, and 9Ah must be clocked into

the device. After the last bit of the opcode sequence has been clocked in, the CS pin must be deasserted to

disable the sector protection.

Figure 6. Disable Sector Protection

Table 6. Enable Sector Protection Command

Command

Byte 1

Byte 2

Byte 3

Byte 4

Enable Sector Protection

3Dh

2Ah

7Fh

A9h

Table 7. Disable Sector Protection Command

Command

Byte 1

Byte 2

Byte 3

Byte 4

Disable Sector Protection

3Dh

2Ah

7Fh

9Ah

3Dh

2Ah

7Fh

A9h

Each transition represents eight bits

3Dh

2Ah

7Fh

9Ah

Each transition represents eight bits

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