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M24LR04E-R 数据表(PDF) 108 Page - STMicroelectronics |
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M24LR04E-R 数据表(HTML) 108 Page - STMicroelectronics |
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108 / 142 page  Command codes M24LR04E-R 108/142 Doc ID 022208 Rev 5 Response parameter: ● Error code as Error_flag is set: – 10h: the specified block is not available – 15h: the specified block is read protected . When configured in the RF busy mode, the RF WIP/BUSY pin is tied to 0 from the SOF that starts the Fast Read Single block command to the end of the M24LR04E-R response. When configured in the RF write in progress mode, the RF WIP/BUSY pin remains in high-Z state. 26.18 Fast Inventory Initiated Before receiving the Fast Inventory Initiated command, the M24LR04E-R must have received an Initiate or a Fast Initiate command in order to set the Initiate_ flag. If not, the M24LR04E-R does not answer to the Fast Inventory Initiated command. The subcarrier_flag should be set to 0, otherwise the M24LR04E-R answers with an error code. On receiving the Fast Inventory Initiated request, the M24LR04E-R runs the anticollision sequence. The Inventory_flag must be set to 1. The meaning of flags 5 to 8 is shown in Table 29. The data rate of the response is multiplied by 2. The request contains: ● the flags, ● the Inventory command code, ● the AFI if the AFI flag is set, ● the mask length, ● the mask value, ● the CRC. The M24LR04E-R does not generate any answer in case of error. Figure 70. Fast Read Single Block frame exchange between VCD and M24LR04E-R VCD SOF Fast Read Single Block request EOF M24LR04E-R <-t1-> SOF Fast Read Single Block response EOF Table 90. Fast Inventory Initiated request format Request SOF Request _flags Fast Inventory Initiated IC Mfg code Optional AFI Mask length Mask value CRC16 Request EOF 8 bits C1h 02h 8 bits 8 bits 0 - 64 bits 16 bits |
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