ST25R95 datasheet(12/61 Pages) STMICROELECTRONICS

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4.3

Support of long frames

In Reader mode it is possible to receive up to 528 bytes of frame data from VICC and Type-B cards and up to 256

bytes of frame data from Type-A cards. In this case, the device sends a reply to the external MCU in the following

format:

Table 7. Format of ResultCode

Bit

Meaning

Always 1

Bit 9 of Length

See examples and explanation below

Bit 8 of Length

If set, there are residual bits in the last byte. Applicable only for Type-A protocol.

3:0

Always 0

Figure 10. Long frame format

1 X X 0 0 0 0 0

X X X X X X X X

X X

9 8

ResultCode

Len

Data byte

Number N of data bytes

The number of databytes is 10-bit long.

Table 8. Examples of ResultCode: Len pairs

Result code

Len

Effective length of data

0x80

0x00 - 0xFF

0 - 255 bytes

0xA0

0x00 - 0xFF

256 - 511 bytes

0xC0

0x00 - 0x10

512 - 528 bytes

0x90

0x00 - 0xFF

0 - 255 bytes (1)

0xB0

0x00 - 0xFF

256 - 511 bytes(1)

0xD0

0x00 - 0x10

512 - 528 bytes(1)

1. In ISO 14443A only in case of none integer number of bytes

ST25R95

Support of long frames

DS12807 - Rev 4

page 12/61

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