AT45DB161E datasheet(28/80 Pages) DIALOG

28 / 80 page

AT45DB161E

DS-AT45DB161E–8782N–03-2021

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 uses Buffer 1 for processing. Therefore, the contents of Buffer

1 are altered from their previous state when this command is issued.

Table 8-7.

Program Sector Protection Register Command

Figure 8-5. Program Sector Protection Register

8.3.3

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

results 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 15)

corresponds to Sector 15. Once the last byte of the Sector Protection Register has been clocked out, any

additional clock pulses results in undefined data being output on the SO pin. The CS pin must be deasserted to

terminate the Read Sector Protection Register operation and put the output into a high-impedance state.

Table 8-8.

Read Sector Protection Register Command

Note:

XX = Dummy byte.

Figure 8-6. Read Sector Protection Register

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 + 15

Each transition represents eight bits

Command

Byte 1

Byte 2

Byte 3

Byte 4

Read Sector Protection Register

32h

XXh

32h

Data

n + 1

Data

n + 15

Each transition represents eight bits

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