AT45DB321E datasheet(21/69 Pages) RENESAS

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AT45DB321E

8784M–DFLASH–02/2022

clocked into a byte location of the Sector Protection Register, then the protection status of the sector corresponding to

that byte location cannot be guaranteed.

Example:

If a value of 17h is clocked into byte location 2 of the Sector Protection Register, then the protection status

of Sector 2 cannot be guaranteed.

The Sector Protection Register can be reprogrammed while the sector protection is enabled or disabled. Being able to

reprogram the Sector Protection Register with the sector protection enabled allows the user to temporarily disable the

sector protection to an individual sector rather than disabling sector protection completely.

The Program Sector Protection Register command utilizes Buffer 1 for processing. Therefore, the contents of Buffer 1

will be altered from its previous state when this command is issued.

Table 6-11.

Program Sector Protection Register Command

Figure 6-6.

Program Sector Protection Register

6.16.3 Read Sector Protection Register

To read the Sector Protection Register, an opcode of 32h and three dummy bytes must be clocked into the device. After

the last bit of the opcode and dummy bytes have been clocked in, any additional clock pulses on the SCK pin will result

in the Sector Protection Register contents being output on the SO pin. The first byte (byte location 0) corresponds to

Sector 0 (0a and 0b), the second byte corresponds to Sector 1, and the last byte (byte location 63) corresponds to Sector

63. Once the last byte of the Sector Protection Register has been clocked out, any additional clock pulses will result in

undefined data being output on the SO pin. The CS pin must be deasserted to terminate the Read Sector Protection

Table 6-12. Read Sector Protection Register Command

Note:

XX = Dummy byte

Command

Byte 1

Byte 2

Byte 3

Byte 4

Program Sector Protection Register

3Dh

2Ah

7Fh

FCh

Data Byte

3Dh

2Ah

7Fh

FCh

Data Byte

n + 1

Data Byte

n + 63

Each transition represents eight bits

Command

Byte 1

Byte 2

Byte 3

Byte 4

Read Sector Protection Register

32h

XXh

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