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STRFNFCA 数据表(PDF) 22 Page - STMicroelectronics |
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STRFNFCA 数据表(HTML) 22 Page - STMicroelectronics |
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22 / 74 page  Commands STRFNFCA 22/74 Doc ID 023077 Rev 10 5.5 Pollfield command (0x03) description This command returns the current value of the FieldDet flag. The result of this command depends on the protocol selected. If we select a Reader mode protocol, the flag FieldDet is set to ‘1’ because the RF field is turned ON by the reader. Table 11. POLLFIELD command description Direction Data Comments Example Host to STRFNFCA 03 Command code >>>0x0300 00 Length of data STRFNFCA to Host 00 Result code <<<0x000101 01 Length of data <FieldDet> 01 , if FieldDet is set Table 12. Response for <POLLFIELD> command Function Explanation Response example Comments POLLFIELD Response 00 01 01 This command returns the current state of the RF field. Result code Length of data field [7:1]: RFU 0 : Field detected (if set) |
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