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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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ST25DV64K Scheda tecnica(PDF) 111 Page - STMicroelectronics |
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ST25DV64K Scheda tecnica(HTML) 111 Page - STMicroelectronics |
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111 / 220 page  DocID027603 Rev 4 111/220 ST25DV04K ST25DV16K ST25DV64K RF operations 219 7.6.3 General Command Rules In case of a valid command, the following paragraphs will describe the expected behavior for each command. But in case of an invalid command, in a general manner, the ST25DVxxx will behave as follows: 1. if flag usage is incorrect, the error code 03h will be issued only if the right UID is used in the command, otherwise no response will be issued. 2. error 02h will be issued if the custom command is used with the manufacturer code different from the ST one Another case is if I2C is busy. In this case, any RF command (except Inventory, Select, Stay quiet and Reset to ready) will get 0Fh error code as response only: a) if select flag and address flags are not set at the same time (except if ST25DVxxx is in quiet state) b) if select flag is set and ST25DVxxx is in selected state. For all other commands, if I2C is busy, no response will be issued by ST25DVxxx. 7.6.4 Inventory Upon receiving the Inventory request, the ST25DVxxx runs the anticollision sequence. The Inventory_flag is set to 1. The meaning of flags 5 to 8 is shown in Table 59: Request flags 5 to 8 when inventory_flag, Bit 3 = 1. The request contains: • the flags • the Inventory command code (001) • the AFI if the AFI flag is set • the mask length • the mask value if mask length is different from 0 • the CRC The ST25DVxxx does not generate any answer in case of error. The response contains: • the flags • the Unique ID Table 65. Inventory request format Request SOF Request_flags Inventory Optional AFI Mask length Mask value CRC16 Request EOF - 8 bits 01h 8 bits 8 bits 0 - 64 bits 16 bits - Table 66. Inventory response format Response SOF Response_flags DSFID UID CRC16 Response EOF - 8 bits 8 bits 64 bits 16 bits - |
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