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ST25DV04K Datasheet(PDF) 133 Page - STMicroelectronics |
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ST25DV04K Datasheet(HTML) 133 Page - STMicroelectronics |
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133 / 200 page  Response parameters: • No parameter. The response is sent back after the write cycle. Table 231. Fast Write Message 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 with no information given Figure 70. Fast Write Message frame exchange between VCD and ST25DVxxx SOF Fast Write Message request VCD EOF ST25DVxxx t1 SOF Fast Write Message response EOF SOF EOF ST25DVxxx 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 ST25DV 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 ST25DVxxx answers with an error code. The data rate of the response is multiplied by 2 compared to Read Message Length command. Table 232. 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) ST25DV04K ST25DV16K ST25DV64K RF commands DS10925 - Rev 9 page 133/200 |
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