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AN332 Datasheet(PDF) 88 Page - Silicon Laboratories |
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AN332 Datasheet(HTML) 88 Page - Silicon Laboratories |
88 / 302 page ![]() AN332 88 Rev. 1.0 Property 0x0202. REFCLK_PRESCALE Sets the number used by the prescaler to divide the external RCLK down to the internal REFCLK. The range may be between 1 and 4095 in 1 unit steps. For example, an RCLK of 13 MHz would require a prescaler value of 400 to divide it to 32500 Hz. The reference clock frequency property would then need to be set to 32500 Hz. The RCLK must be valid 10 ns before sending and 20 ns after completing the FM_TUNE_FREQ and FM_TUNE_START commands. In addition, the RCLK must be valid at all times for proper AFC operation. The RCLK may be removed or reconfigured at other times. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is 1. Available in: All Default: 0x0001 Step: 1 Range: 1–4095 Bit D15 D14 D13 D12 D11 D10 D9 D8D7D6D5D4D3D2D1D0 Name 00 0 RCLK SEL REFCLKP[11:0] Bit Name Function 15:13 Reserved Always write to 0. 12 RCLKSEL RCLKSEL. 0 = RCLK pin is clock source. 1 = DCLK pin is clock source. 11:0 REFCLKP[11:0] Prescaler for Reference Clock. Integer number used to divide clock frequency down to REFCLK frequency. The allowed REFCLK frequency range is between 31130 and 34406 Hz (32768 5%), or 0 (to disable AFC). |
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