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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) 125 Page - STMicroelectronics |
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ST25DV64KC Scheda tecnica(HTML) 125 Page - STMicroelectronics |
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125 / 203 page  Table 206. 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) • Pointer (start at 00h) • Number of bytes is one less then the requested data Table 207. 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 68. Read Message frame exchange between VCD and ST25DVxxKC SOF Read Message request VCD ST25DVxxKC EOF SOF Read Message response EOF t1 7.6.34 Fast Read Message On receiving the Fast 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, 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. ST25DV04KC ST25DV16KC ST25DV64KC RF commands DS13519 - Rev 3 page 125/203 |
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