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M24LR64E-R 数据表(PDF) 111 Page - STMicroelectronics |
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M24LR64E-R 数据表(HTML) 111 Page - STMicroelectronics |
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111 / 140 page  M24LR64E-R Command codes Doc ID 022712 Rev 3 111/140 26.21 Inventory Initiated Before receiving the Inventory Initiated command, the M24LR64E-R must have received an Initiate or a Fast Initiate command in order to set the Initiate_ flag. If not, the M24LR64E-R does not answer the Inventory Initiated command. On receiving the Inventory Initiated request, the M24LR64E-R runs the anticollision sequence. The Inventory_flag must be set to 1. The meaning of flags 5 to 8 is given in Table 29. 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 M24LR64E-R does not generate any answer in case of error. The response contains: ● the flags, ● the Unique ID. During an Inventory process, if the VCD does not receive an RF M24LR64E-R response, it waits for a time t3 before sending an EOF to switch to the next slot. t3 starts from the rising edge of the request EOF sent by the VCD. ● If the VCD sends a 100% modulated EOF, the minimum value of t3 is: t3min = 4384/fC (323.3µs) + tSOF ● If the VCD sends a 10% modulated EOF, the minimum value of t3 is: t3min = 4384/fC (323.3µs) + tNRT where: ● tSOF is the time required by the M24LR64E-R to transmit an SOF to the VCD ● tNRT is the nominal response time of the M24LR64E-R tNRT and tSOF are dependent on the M24LR64E-R-to-VCD data rate and subcarrier modulation mode. Table 99. Inventory Initiated request format Request SOF Request _flags Inventory Initiated IC Mfg code Optional AFI Mask length Mask value CRC16 Request EOF 8 bits D1h 02h 8 bits 8 bits 0 - 64 bits 16 bits Table 100. Inventory Initiated response format Response SOF Response _flags DSFID UID CRC16 Response EOF 8 bits 8 bits 64 bits 16 bits |
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