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ST25DV04K bảng dữ liệu(PDF) 64 Page - STMicroelectronics |
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ST25DV04K bảng dữ liệu(HTML) 64 Page - STMicroelectronics |
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64 / 220 page  ST25DVxxx specific features ST25DV04K ST25DV16K ST25DV64K 64/220 DocID027603 Rev 4 At boot time, and each time RF_MNGT register it is updated, content of RF_MNGT_Dyn register is copied from RF_MNGT register. The content of RF_MNGT_Dyn register is used during application to set ST25DVxxx behavior. Content of this dynamic register RF_MNGT_Dyn can be updated on the fly, to temporarily modify the behavior of ST25DVxxx without affecting the static value of RF_MNGT which will be recovered at next POR. RF_MNGT register is composed of two bits (see Table 27: RF_MNGT_Dyn): RF_DISABLE and RF_SLEEP For a normal usage of RF interface, bits RF_SLEEP and RF_DISABLE must be set to 0. For RF are offered three modes: • RF sleep mode: – When RF_SLEEP is set to 1, all RF communications are disabled, RF interface doesn’t interpret commands, but minimizes consumption of RF interface. • RF disable mode: – When RF_SLEEP is set to 0 and RF_DISABLE is set to 1, RF commands are interpreted but not executed. In case of a valid command, ST25DV will respond after t1 with the error code 0Fh. Inventory and Stay Quiet commands are not answered. • RF normal mode: – In normal usage, RF_SLEEP and RF_DISABLE are set to 0, ST25DVxxx will process the request and respond accordingly when I2C is not accessing ST25DVxxx. If I2C is busy, ST25DV will respond to RF request with the error code 0Fh. Whatever RF_MNGT register value, the Field detection remains available leaving to master the possibility to temporarily open RF communication by overwriting value in RF_MNGT_Dyn dynamic register. |
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