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CC2500-RTR1 数据表(PDF) 59 Page - Texas Instruments |
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CC2500-RTR1 数据表(HTML) 59 Page - Texas Instruments |
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59 / 84 page  CC2500 PRELIMINARY Data Sheet (Rev.1.2) SWRS040A Page 59 of 83 0x0B: FSCTRL1 – Frequency synthesizer control Bit Field Name Reset R/W Description 7:5 Reserved R0 4:0 FREQ_IF[4:0] 15 (0x0F) R/W The desired IF frequency to employ in RX. Subtracted from FS base frequency in RX and controls the digital complex mixer in the demodulator. IF FREQ f f XOSC IF _ 2 10 ⋅ = The default value gives an IF frequency of 381 kHz, assuming a 26.0 MHz crystal. 0x0C: FSCTRL0 – Frequency synthesizer control Bit Field Name Reset R/W Description 7:0 FREQOFF[7:0] 0 (0x00) R/W Frequency offset added to the base frequency before being used by the FS. (2-complement). Resolution is FXTAL/2 14 (1.59 - 1.65 kHz); range is ±202 kHz to ±210 kHz, dependent of XTAL frequency. 0x0D: FREQ2 – Frequency control word, high byte Bit Field Name Reset R/W Description 7:6 FREQ[23:22] 1 (01) R FREQ[23:22] is always binary 01 (the FREQ2 register is in the range 85 to 95 with 26-27 MHz crystal) 5:0 FREQ[21:16] 30 (0x1E) R/W FREQ[23:0] is the base frequency for the frequency synthesiser in increments of FXOSC/2 16. [] 0 : 23 2 16 FREQ f f XOSC carrier ⋅ = The default frequency word gives a base frequency of 2464 MHz, assuming a 26.0 MHz crystal. With the default channel spacing settings, the following FREQ2 values and channel numbers can be used: FREQ2 Base frequency Frequency range (CHAN numbers) 91 (0x5B) 2386 MHz 2400.2-2437 MHz (71-255) 92 (0x5C) 2412 MHz 2412-2463 MHz (0-255) 93 (0x5D) 2438 MHz 2431-2483.4 MHz (0-227) 94 (0x5E) 2464 MHz 2464-2483.4 MHz (0-97) 0x0E: FREQ1 – Frequency control word, middle byte Bit Field Name Reset R/W Description 7:0 FREQ[15:8] 196 (0xC4) R/W Ref. FREQ2 register 0x0F: FREQ0 – Frequency control word, low byte Bit Field Name Reset R/W Description 7:0 FREQ[7:0] 236 (0xEC) R/W Ref. FREQ2 register |
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