AT88SC0204CRF Просмотр технического описания (PDF) - Atmel Corporation
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AT88SC0204CRF Datasheet PDF : 9 Pages
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CRC Error Detection
Type A Tolerance
AT88SC0204CRF
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.
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
SOF
K data bytes
CRC1 CRC2
EOF
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.
3
5022CS–CRRF–12/06
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