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ST25DV64K Datasheet(PDF) 121 Page - STMicroelectronics |
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ST25DV64K Datasheet(HTML) 121 Page - STMicroelectronics |
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121 / 200 page  Table 201. 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 202. 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 61. Read Message Length frame exchange between VCD and ST25DVxxx SOF Read Message Length request VCD ST25DVxxx EOF SOF Read Message Length response EOF t1 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 203. Read Message request format Request SOF Request_flags Read Message IC Mfg code UID (1) MBpointer Number of Bytes CRC16 Request EOF - 8 bits ACh 02h 64 bits 8 bits 8 bits 16 bits - 1. This field is optional. Request parameters: • Request flag • UID (Optional) ST25DV04K ST25DV16K ST25DV64K RF commands DS10925 - Rev 9 page 121/200 |
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