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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AS3955 데이터시트(PDF) 50 Page - ams AG |
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AS3955 데이터시트(HTML) 50 Page - ams AG |
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50 / 102 page  Page 50 ams Datasheet Document Feedback [v1-04] 2016-Feb-03 AS3955 − Detailed Description Figure 51: Data Transmission from MCU to NFC Device When the NFC device has successfully read all data from the buffer, it shall clear the buffer and prepare for further data transfer by issuing a WRITE command to address FFh. This will trigger a Tx end interrupt. If a READ command is received on address FCh prior to the Transmit Buffer command, AS3955 will return zero data, io_busy set to 1 and io_data_rdy set to 0. A NFC device can then poll AS3955 by continuously sending READ commands at address FCh and waiting until the last word equals 01h. A READ command can be issued only to address FCh. Issuing a READ command to any other address than FCh while in Extended mode shall be treated as an error. In Extended mode, it is assumed that AS3955 will always receive 16 bytes and transmit 12 bytes of data, 3 empty bytes and 1 byte for FLAGS. If the message size differs in any direction, then the MCU or NFC device are responsible for proper error management. & & & && &> '^ &> '^ Z & Z Z & Z tZ/d && Z < |
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