Steps to Set Write-Protection Password

1.Connect to the Tag:

Establish a connection with the NTAG213 using your NFC-enabled device.

2.Read the Current Configuration:

Use the READ command to check the current configuration of the tag, especially the memory pages related to password protection.

3.Write the Password:

Use the WRITE command to set the password on the tag. The password is stored in a specific memory page (typically page 43 for NTAG213).

4.Set the PACK (Password Acknowledgment):

Write the password acknowledgment (PACK) to the appropriate memory location (usually page 44). This is a 2-byte value used for authentication.

5.Configure the AUTH0 Register:

Set the AUTH0 byte to define the starting page number from which the password protection should be enabled. This is done by writing to the correct configuration page (usually page 42).

6.Enable the Password Protection:

Configure the ACCESS byte to enable write protection. This byte allows you to set features like password protection for write operations.

Example Commands

Write Password:

Command: A2 2B PWD0 PWD1 PWD2 PWD3 Here, PWD0 to PWD3 are the bytes of your password. Write PACK:

Command: A2 2C PACK0 PACK1 00 00 PACK0 and PACK1 are the 2-byte password acknowledgment. Set AUTH0:

Command: A2 2A AUTH0 00 00 00 AUTH0 is the page number from which protection starts. Considerations Security: Choose a strong password and keep it secure. Testing: After setting the password, test the protection by attempting to write to a protected page without providing the password. By following these steps, you can effectively set a write-protection password on an NXP NTAG213 tag. Make sure to refer to the NTAG213 datasheet for detailed information on memory layout and command specifics.