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AT88SC0808CRF Datasheet(PDF) 9 Page - ATMEL Corporation |
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AT88SC0808CRF Datasheet(HTML) 9 Page - ATMEL Corporation |
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9 / 108 page  9 5276A–RFID–07/08 AT88SC0104/0204/0404/0808/1616/3216/6416CRF 4.1 Anticollision Command Definitions Commands in this section are arranged in order by the hexadecimal code in the command byte. 4.2 REQB / WUPB Polling Commands [$05] The REQB / WUPB command is used to search for PICCs in the RF field. The command and response are ISO/IEC 14443-3:2001 compliant. 4.2.1 Operation The “Request B” (REQB) and “Wake-Up B” (WUPB) commands are used to probe the RF field for Type B PICCs as the first step in the anticollision process. The response to an REQB or WUPB command is the “Answer to Request B” (ATQB). PICCs in the Active State are not per- mitted to answer this command. 4.2.2 Command Field Descriptions AFI: The Application Family Identifier (AFI) is used to select the family and sub-family of cards which the PCD is targeting. Only PICCs with a matching AFI code are permitted to answer an REQB or WUPB command. Table 4-3 describes the AFI matching criteria. An AFI of $00 acti- vates all Type B PICCs. Reader PICC Command > $05 AFI PARAM CRC1 CRC2 ATQB Response > $50 SUCCESS RESPONSE PUPI 0 System Zone Byte $00 PUPI 1 System Zone Byte $01 PUPI 2 System Zone Byte $02 PUPI 3 System Zone Byte $03 APP 0 System Zone Byte $04 APP 1 System Zone Byte $05 APP 2 System Zone Byte $06 APP 3 System Zone Byte $07 Protocol 1 $00 Protocol 2 System Zone Byte $08 Protocol 3 $51 CRC1 CRC2 |
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