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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM8985GEFL/R датащи(PDF) 80 Page - Wolfson Microelectronics plc |
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WM8985GEFL/R датащи(HTML) 80 Page - Wolfson Microelectronics plc |
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80 / 118 page  WM8985 Pre-Production w PP, Rev 3.4, October 2006 80 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 4 PLLPRESCALE 0 0 = MCLK input not divided (default) 1 = Divide MCLK by 2 before input to PLL R36 (24h) PLL N value 3:0 PLLN 1000 Integer (N) part of PLL input/output frequency ratio. Use values greater than 5 and less than 13. R37 (25h) PLL K value 1 5:0 PLLK [23:18] 0Ch R38 (26h) PLL K Value 2 8:0 PLLK [17:9] 093h R39 (27h) PLL K Value 3 8:0 PLLK [8:0] 0E9h Fractional (K) part of PLL1 input/output frequency ratio (treat as one 24-digit binary number). Table 47 PLL Frequency Ratio Control The PLL performs best when f2 is around 90MHz. Its stability peaks at N=8. Some example settings are shown in 48. K REGISTERS MCLK (MHz) (f1) DESIRED OUTPUT (SYSCLK) (MHz) f2 (MHz) R N K N REGISTER R36[3:0] R37 R38 R39 12 11.29 90.3168 1 2 7.5264 7h 86C226h XX7h 021h 161h 026h 12 12.288 98.304 1 2 8.192 8h 3126E8h XX8h 00Ch 093h 0E8h 13 11.29 90.3168 1 2 6.947446 6h F28BD4h XX6h 03Ch 145h 1D4h 13 12.288 98.304 1 2 7.561846 7h 8FD525h XX7h 023h 1EAh 125h 14.4 11.29 90.3168 1 2 6.272 6h 45A1CAh XX6h 011h 0D0h 1CAh 14.4 12.288 98.304 1 2 6.826667 6h D3A06Eh XX6h 034h 1D0h 06Eh 19.2 11.29 90.3168 2 2 9.408 9h 6872AFh XX9h 01Ah 039h 0AFh 19.2 12.288 98.304 2 2 10.24 Ah 3D70A3h XXAh 00Fh 0B8h 0A3h 19.68 11.29 90.3168 2 2 9.178537 9h 2DB492h XX9h 00Bh 0DAh 092h 19.68 12.288 98.304 2 2 9.990243 9h FD809Fh XX9h 03Fh 0C0h 09Fh 19.8 11.29 90.3168 2 2 9.122909 9h 1F76F7h XX9h 007h 1BBh 0F7h 19.8 12.288 98.304 2 2 9.929697 9h EE009Eh XX9h 03Bh 100h 09Eh 24 11.29 90.3168 2 2 7.5264 7h 86C226h XX7h 021h 161h 026h 24 12.288 98.304 2 2 8.192 8h 3126E8h XX8h 00Ch 093h 0E8h 26 11.29 90.3168 2 2 6.947446 6h F28BD4h XX6h 03Ch 145h 1D4h 26 12.288 98.304 2 2 7.561846 7h 8FD525h XX7h 023h 1EAh 125h 27 11.29 90.3168 2 2 6.690133 6h B0AC93h XX6h 02Ch 056h 093h 27 12.288 98.304 2 2 7.281778 7h 482296h XX7h 012h 011h 096h Table 48 PLL Frequency Examples |
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