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ST25DV64K 数据表(PDF) 122 Page - STMicroelectronics |
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ST25DV64K 数据表(HTML) 122 Page - STMicroelectronics |
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122 / 200 page  • Pointer (start at 00h) • Number of bytes is one less then the requested data Table 204. Read Message response format when Error_flag is NOT set Response SOF Response_flags Mailbox content CRC16 Response EOF - 8 bits (Number of bytes + 1) bytes (1) 16 bits - 1. Number of message Bytes when Number of Bytes is set to 00h. Response parameters: • (number of data + 1 ) data bytes Response parameter: • Error code as Error_flag is set: – 02h: command not recognized – 03h: command option not supported – 0Fh: error with no information given Figure 62. Read Message frame exchange between VCD and ST25DVxxx SOF Read Message request VCD ST25DVxxx EOF SOF Read Message response EOF t1 7.6.34 Fast Read Message On receiving the Fast 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, Fast 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 mailbox message automatically clears b1 of MB_CTRL_Dyn “HOST_PUT_MSG” and allows RF to put a new message. The data rate of the response is multiplied by 2 compated to Read Message. The subcarrier_flag should be set to 0, otherwise the ST25DVxxx answers with an error code. The Option_flag is not supported, and the Inventory_flag must be set to 0. Table 205. Fast Read Message request format Request SOF Request_flags Fast Read Message IC Mfg code UID(1) MBpointer Number of Bytes CRC16 Request EOF - 8 bits CCh 02h 64 bits 8 bits 8 bits 16 bits - 1. This field is optional Request parameters: • Request flag ST25DV04K ST25DV16K ST25DV64K RF commands DS10925 - Rev 9 page 122/200 |
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