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AS3955 データシート(PDF) 24 Page - ams AG |
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AS3955 データシート(HTML) 24 Page - ams AG |
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24 / 111 page  Page 24 ams Datasheet Document Feedback [v1-01] 2015-Apr-29 AS3955 − Detailed Description ACK Response The ACK response of AS3955 is a 4-bit value Ah. NACK Response The AS3955 uses all four combinations of NAK values. The usage of various NAK values is explained in section Error Handling. Access to UID, SENS_RES and SEL_REQ During Anti-Collision UID block, SENSR1, SENSR2 and SELR bytes are stored in a buffer. The purpose of storing these data into the buffer is faster access to the data and UID verification during the anti-collision procedure. Buffer access over SPI / I²C is locked until NFC tag enters SELECTED state. Get Version Command In addition to standard NFC tag commands, AS3955 supports a custom Get Version command. This command consists of 8 bits and shall be transmitted only in standalone and Extended mode when the tag is SELECTED state. The command code and the tag response are shown resp. in Figure 24 and Figure 25. Figure 24: Coding of Get Version Command b8 b7 b6 b5 b4 b3 b2 b1 011000 0 0 |
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