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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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ST25DV64K Scheda tecnica(PDF) 152 Page - STMicroelectronics |
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ST25DV64K Scheda tecnica(HTML) 152 Page - STMicroelectronics |
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152 / 220 page  RF operations ST25DV04K ST25DV16K ST25DV64K 152/220 DocID027603 Rev 4 Response parameters: • One byte of data: MB_LEN_Dyn register value Response parameter: • Error code as Error_flag is set – 02h: command not recognized – 03h: the option is not supported – 0Fh: error given with no information 7.6.33 Read Message On receiving the Read Message command, the ST25DVxxx 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. Table 164. 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 - Table 165. 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 - Figure 61. Read Message Length frame exchange between VCD and ST25DVxxx VCD SOF Read Message Length request EOF ST25DVxxx <-t1-> SOF Read Message Length response EOF |
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