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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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ST25DV64KC Scheda tecnica(PDF) 124 Page - STMicroelectronics |
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ST25DV64KC Scheda tecnica(HTML) 124 Page - STMicroelectronics |
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124 / 203 page  Table 203. Read Message Length request format Request SOF Request_flags Read Message Length IC Mfg code UID (1) CRC16 Request EOF - 8 bits ABh 02h 64 bits 16 bits - 1. The field is optional. Request parameters: • UID (Optional) Table 204. Read Message Length response format when Error_flag is NOT set Response SOF Response_flags Data CRC16 Response EOF - 8 bits 8 bits 16 bits - Response parameters: • One byte of data: MB_LEN_Dyn register value Table 205. Read Message Length response format when Error_flag is set Response SOF Response_flags error code CRC16 Response EOF - 8 bits 8 bits 16 bits - Response parameter: • Error code as Error_flag is set: – 02h: command not recognized – 03h: command option not supported – 0Fh: error given with no information Figure 67. Read Message Length frame exchange between VCD and ST25DVxxKC SOF Read Message Length request VCD ST25DVxxKC EOF SOF Read Message Length response EOF t1 7.6.33 Read Message On receiving the Read Message command, the ST25DVxxKC reads up to 256 byte in the Mailbox from the location specified by MBpointer and sends back their value in the response. First MailBox location is '00’. When Number of bytes is set to 00h and MBPointer is equals to 00h, the MB_LEN bytes of the full message are returned. Otherwise, Read Message command returns (Number of Bytes + 1) bytes (i.e. 01h returns 2 bytes, FFh returns 256 bytes). An error is reported if (Pointer + Nb of bytes + 1) is greater than the message length. RF Reading of the last byte of the mailbox message automatically clears b1 of MB_CTRL_Dyn “HOST_PUT_MSG”, and allows RF to put a new message. The Option_flag is not supported. The Inventory_flag must be set to 0. ST25DV04KC ST25DV16KC ST25DV64KC RF commands DS13519 - Rev 3 page 124/203 |
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