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ST25DV04K 数据表(PDF) 78 Page - STMicroelectronics |
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ST25DV04K 数据表(HTML) 78 Page - STMicroelectronics |
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78 / 200 page  Table 94. Definition of request flags 1 to 4 Bit No Flag Level Description Bit 1 Subcarrier_flag (1) 0 A single subcarrier frequency is used by the ST25DVxxx 1 Two subcarriers are used by the ST25DVxxx Bit 2 Data_rate_flag (2) 0 Low data rate is used 1 High data rate is used Bit 3 Inventory_flag 0 The meaning of flags 5 to 8 is described in Table 95. Request flags 5 to 8 when inventory_flag, Bit 3 = 0 1 The meaning of flags 5 to 8 is described in Table 96. Request flags 5 to 8 when inventory_flag, Bit 3 = 1 Bit 4 Protocol_extension _flag 0 No Protocol format extension 1 Protocol format extension. Reserved for future use. 1. Subcarrier_flag refers to the ST25DVxxx-to-VCD communication. 2. Data_rate_flag refers to the ST25DVxxx-to-VCD communication. Table 95. Request flags 5 to 8 when inventory_flag, Bit 3 = 0 Bit nb Flag Level Description Bit 5 Select flag (1) 0 The request is executed by any ST25DVxxx according to the setting of Address_flag 1 The request is executed only by the ST25DVxxx in Selected state Bit 6 Address flag 0 The request is not addressed. UID field is not present. The request is executed by all ST25DVxxxs. 1 The request is addressed. UID field is present. The request is executed only by the ST25DVxxx whose UID matches the UID specified in the request. Bit 7 Option flag 0 Option not activated. 1 Option activated. Bit 8 RFU 0 - 1. If the Select_flag is set to 1, the Address_flag is set to 0 and the UID field is not present in the request. Table 96. Request flags 5 to 8 when inventory_flag, Bit 3 = 1 Bit nb Flag Level Description Bit 5 AFI flag 0 AFI field is not present 1 AFI field is present Bit 6 Nb_slots flag 0 16 slots 1 1 slot Bit 7 Option flag 0 - Bit 8 RFU 0 - ST25DV04K ST25DV16K ST25DV64K RF protocol description DS10925 - Rev 9 page 78/200 |
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