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CC2400-RTR1 数据表(PDF) 60 Page - Texas Instruments |
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CC2400-RTR1 数据表(HTML) 60 Page - Texas Instruments |
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60 / 84 page ![]() CC2400 SWRS042A Page 60 of 83 FSCTRL (0x01) - Frequency Synthesiser Control and Status Bit Field Name Reset R/W Description 15:6 - 0 W0 Reserved, write as 0. 5:4 LOCK_THRESHOLD[1:0] 1 R/W Number of consecutive reference clock periods with successful sync windows required to indicate lock: 0: 64 1: 128 2: 256 3: 512 3 CAL_DONE 0 R Calibration has been performed since the last time the FS was turned on. 2 CAL_RUNNING 0 R Calibration status, '1' when calibration in progress. 1 LOCK_LENGTH 0 R/W LOCK_WINDOW pulse width: 0: 2 CLK_PRE periods 1: 4 CLK_PRE periods 0 LOCK_STATUS 0 R '1' when PLL is in lock, otherwise '0'. FSDIV (0x02) - Frequency Synthesiser Frequency Division Control Bit Field Name Reset R/W Description 15:12 - 0 W0 Reserved, write as 0. 11:10 FREQ[11:10] 2 R Read only. Directly gives the right frequency in MHz when reading/writing FREQ[11:0] . 9:0 FREQ[9:0] 353 R/W Frequency control word. [ ][ ] 0 : 9 2048 0 : 11 FREQ FREQ f c + = = [MHz] where fc is the channel centre frequency. See page 47 for a description of how to program the channel for tansmit and receive modes respectively. Reading/writing FREQ[11:0] gives the right frequency in MHz. The default value corresponds to fc=2401MHz. MDMCTRL (0x03) - Modem Control and Status Bit Field Name Reset R/W Description 15:13 - 0 W0 Reserved, write as 0. 12:7 MOD_OFFSET[5:0] 0 R/W Modulator/Demodulator centre frequency in 15.625 kHz steps (for the receiver the steps are relative to 1 MHz, for the transmitter the steps are relative to 0MHz when MDMTST0.TX_1MHZ_OFFSET_N=1 ). Two's complement signed value. I.e. MOD_OFFSET=0x1F centre frequency=1.48 MHz; MOD_OFFSET=0x20 centre frequency=0.50 MHz. 6:0 MOD_DEV[6:0] 64 R/W Modulator frequency deviation in 3.9062 kHz steps (0-500 kHz). Unsigned value. Reset value gives a deviation of 250 kHz. |
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