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ST25R3911B 数据表(PDF) 27 Page - STMicroelectronics |
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ST25R3911B 数据表(HTML) 27 Page - STMicroelectronics |
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27 / 116 page  1.2.13 Direct commands Table 9. Direct commands Command code (hex) Command Comments Command chaining Interrupt after Termination Operation mode (1) C1 Set default Puts the ST25R3911B in default state (same as after power-up) No No All C2, C3 Clear Stops all activities and clears FIFO Yes No en C4 Transmit with CRC Starts a transmit sequence using automatic CRC generation Yes No en, tx_en C5 Transmit without CRC Starts a transmit sequence without automatic CRC generation Yes No en, tx_en C6 Transmit REQA Transmits REQA command (ISO14443A mode only) Yes No en, tx_en C7 Transmit WUPA Transmits WUPA command (ISO14443A mode only) Yes No en, tx_en C8 NFC initial field ON Performs initial RF collision avoidance and switch on the field Yes Yes en (2) C9 NFC response field ON Performs response RF collision avoidance and switch on the field Yes Yes en(2) CA NFC response field ON with n=0 Performs response RF collision avoidance with n=0 and switch on the field Yes Yes en(2) CB Go to normal NFC mode Accepted in NFCIP-1 active communication bit rate detection mode Yes No - CC Analog preset Presets Rx and Tx configuration based on state of Mode definition register and Bit rate definition register Yes No All D0 Mask receive data Receive after this command is ignored Yes No en, rx_en D1 Unmask receive data Receive data following this command is normally processed (this command has priority over internal Mask Receive timer) Yes No en, rx_en D2 - Not used - - - D3 Measure amplitude Amplitude of signal present on RFI inputs is measured, result is stored in A/D converter output register No Yes en D4 Squelch Performs gain reduction based on the current noise level No No en, rx_en D5 Reset Rx gain Clears the current squelch setting and loads the manual gain reduction from Receiver configuration register 1 No No en D6 Adjust regulators Adjusts supply regulators according to the current supply voltage level No Yes en (3) D7 Calibrate modulation depth Starts sequence that activates the Tx, measures the modulation depth and adapts it to comply with the specified modulation depth No Yes en D8 Calibrate antenna Starts the sequence to adjust parallel capacitances connected to TRIMx_y pins so that the antenna LC tank is in resonance No Yes en D9 Measure phase Measurement of phase difference between the signal on RFO and RFI No Yes en ST25R3911B Application information DS11793 - Rev 6 page 27/116 |
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