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N682387MG Datasheet(PDF) 40 Page - Nuvoton Technology Corporation |
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N682387MG Datasheet(HTML) 40 Page - Nuvoton Technology Corporation |
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40 / 160 page  N682386/87 + N681622 Dual Programmable Extended Codec/SLCC + SLFC Revision 1.3 Page 40 of 160 Sep 2010 12.1.3.2.1. SINUSOIDAL RINGING Sinusoidal Ringing is selected by setting RMPC:TRAP[7] address (0xC1) to LOW. For a desired frequency fR is calculated and programmed as before (see section Tone Generation). The oscillator initial condition for oscillator 2 is set in register O2ICn[17:0] address (0xC4 – 0xC5) according to the following equation. Description Equation Desired frequency ft The resulting hexadecimal coefficient is input to registers OS2CH and OS2C and ROFFS 17 2 * kHz 8 t f * π * 2 cos 0] : O2CCn[17 ⎥ ⎥ ⎥ ⎦ ⎤ ⎢ ⎢ ⎢ ⎣ ⎡ = (n: 1, 2) Oscillator initial condition for oscillator 2 The resulting hexadecimal coefficient is input to registers OS2ICH and OS2ICL 15 2 * kHz 8 R f * π * 2 sin * A 0] : O2ICCn[15 ⎥ ⎥ ⎥ ⎦ ⎤ ⎢ ⎢ ⎢ ⎣ ⎡ = (n: 1, 2) A is calculated from the desired peak amplitude, APK, in volts 96 PK A A = Note that A is calculated differently for Tone Generation. Finally the precise phase position where the sinusoidal ringing signal begins transmitting can be controlled by programming a transmission or phase delay of up to 31.8 ms into OS2RPD:O2RPDCn[7:0] address (0xAD). If the zero-crossing feature is enabled signal transmission will end at the equivalent phase position. Target Frequency (Hz) Frequency with Dual Pro–X (Hz) O2CCn[17:0] 10 11.12 1FFFB 11 11.12 1FFFB 12 12.18 1FFFA 13 13.15 1FFF9 14 14.07 1FFF8 15 15.73 1FFF6 16 16.49 1FFF5 17 17.22 1FFF4 18 18.60 1FFF2 19 19.27 1FFF1 20 20.51 1FFEF 25 25.37 1FFE6 50 50.26 1FF9A Table 16: Example Ringer Register settings |
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