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ST25DV16KC-JF8D3 bảng dữ liệu(PDF) 136 Page - STMicroelectronics |
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ST25DV16KC-JF8D3 bảng dữ liệu(HTML) 136 Page - STMicroelectronics |
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136 / 203 page ![]() Figure 76. Fast Write Message frame exchange between VCD and ST25DVxxKC SOF Fast Write Message request VCD EOF ST25DVxxKC t1 SOF Fast Write Message response EOF SOF EOF ST25DVxxKC t1 Write sequence when error Fast Write Message response Write sequence when no error 7.6.42 Fast Read Message Length On receiving the Fast Read Message Length command, the ST25DVxxKC reads the MB_LEN_dyn register which contains the mailbox message length and sends back its 8-bit value in the response. The value of MB_LEN_Dyn returned is the (size of the message length in Bytes - 1). The Option_flag is not supported. The Inventory_flag must be set to 0. The subcarrier_flag should be set to 0, otherwise the ST25DVxxKC answers with an error code. The data rate of the response is multiplied by 2 compared to Read Message Length command. Table 235. Fast Read Message Length request format Request SOF Request_flags Fast Read Message Length IC Mfg code UID (1) CRC16 Request EOF - 8 bits CBh 02h 64 bits 16 bits - 1. This field is optional. Request parameters: • Request flag • UID (optional) Table 236. Fast 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: volatile Control register. Table 237. Fast 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 - ST25DV04KC ST25DV16KC ST25DV64KC RF commands DS13519 - Rev 3 page 136/203 |
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