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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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ST25DV64K 数据表(PDF) 101 Page - STMicroelectronics |
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ST25DV64K 数据表(HTML) 101 Page - STMicroelectronics |
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101 / 220 page  DocID027603 Rev 4 101/220 ST25DV04K ST25DV16K ST25DV64K RF operations 219 7.4.2 ST25DVxxx states referring to RF protocol The ST25DVxxx can be in one of four states: • Power-off • Ready • Quiet • Selected Transitions between these states are specified in Figure 33: ST25DVxxx state transition diagram and Table 55: ST25DVxxx response depending on Request_flags. Power-off state The ST25DVxxx is in the Power-off state when it does not receive enough energy from the VCD. Ready state The ST25DVxxx is in the Ready state when it receives enough energy from the VCD. When in the Ready state, the ST25DVxxx answers any request where the Select_flag is not set. Quiet state When in the Quiet state, the ST25DVxxx answers any request with the Address_flag set, except for Inventory requests. Selected state In the Selected state, the ST25DVxxx answers any request in all modes (see Section 7.4.3: Modes): • Request in Select mode with the Select_flag set • Request in Addressed mode if the UID matches • Request in Non-Addressed mode as it is the mode for general requests Figure 32. ST25DVxxx protocol timing VCD Request frame Request frame ST25DVx xx Response frame Response frame Timing <-t1-> <-t2-> <-t1-> <-t2-> |
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