NDEF data

AN3408

10/38

DocID018867 Rev 4

Read access condition values defined by bit 3 and bit 4 of CC1 byte are described in

Table 8.

Write access condition values defined by bit 0 and bit 1 of CC1 byte are described in

Table 9. Write access condition values depend on the product. For more details, refer to the

corresponding STMicroelectronics datasheet.

Note:

Bit 2 and bit 3 of CC1 byte (read access values) shall be reset to 0b00 value.

The user shall set the write protection bit according to bit 0 and bit 1 of CC1 byte. For more

details, refer to the definition of the lock command in the corresponding STMicroelectronics

datasheet.

Example 1

1.

If bit number 2 of CC3 is set, the memory size exceeds 2040 bytes (CC2 overflow). The real memory size can be obtained

with the GetSystemInformation command. For more information about the GetSystemInformation command, refer to the

corresponding STMicroelectronics datasheet.

Table 8. Read access condition

Read access condition value

Description

0b00

Free read access

0b01

RFU

0b10

RFU

0b11

RFU

Table 9. Write access condition

Write access

condition value

Description

LRI1k, LRI2k

LRIS2k, LRIS64k,

M24LR64-R

0b00

Free write access

Yes

Yes

0b01

RFU

No

No

0b10

Write password access (data can be

written after sending a password)

No

Yes

0b11

No write access

Yes

Yes

Table 10. CC field example

Byte name

Value

Bit

Function

CC0

0xE1

7:0

Magic number

CC1

0x40

7:6

Major version number: 0b01

5:4

Minor version number: 0b00

3:2

Read access condition: 0b00 (free read access)

1:0

Write access condition: 0b00 (free write access)