3

AT88SC0808CRF

5027CS–CRRF–12/06

The REQB command performs the same function but does not affect a PICC in the Halt

state. The CryptoRF command set is available only after the anticollision process has

been completed.

CRC Error Detection

A two-byte CRC_B is required in each frame transmitted by the PICC or PCD to permit

transmission error detection. The CRC_B is calculated on all of the command and data

bytes in the frame. The SOF, EOF, start bits, stop bits, and EGT are not included in the

CRC_B calculation. The two-byte CRC_B follows the data bytes in the frame.

Figure 2. Location of the Two CRC_B Bytes within a Frame

Type A Tolerance

The RF Interface is designed for use in multiprotocol applications. It will not latch or lock

up if exposed to Type A signals and will not respond to them. The PICC may reset in the

presence of Type A field modulation but is not damaged by exposure to Type A signals.

SOF

K data bytes

CRC1

CRC2

EOF