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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MC68340 датащи(PDF) 107 Page - Freescale Semiconductor, Inc |
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MC68340 датащи(HTML) 107 Page - Freescale Semiconductor, Inc |
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107 / 441 page  4- 10 MC68340 USER’S MANUAL MOTOROLA using crystal mode, the system clock frequency is programmable (using the W, X, and Y bits in the SYNCR) over the range specified in Section 11 Electrical Characteristics (see Table 4-2.). EXTAL PHASE COMPARATOR LOW-PASS FILTER VCO CRYSTAL OSCILLATOR XTAL XFC PIN VDDSYN XFC VDDSYN 0.1 µF 0.01 µF 0.1 µF NOTE 1: Must be low-leakage capacitor. 20 pF 20 pF 20 M 1 ÷4 MODULUS DIVIDER Y W FEEDBACK DIVIDER 0 1 SEL MUX 0 $3F ÷64 ÷8 6 SEL 0 1 MUX ÷2 0 X CLKOUT Figure 4-4. Clock Block Diagram for Crystal Operation . XTAL EXTAL 60 k Ω 60 k Ω Figure 4-5. MC68340 Crystal Oscillator A separate power pin (VCCSYN) is used to allow the clock circuits to run with the rest of the device powered down and to provide increased noise immunity for the clock circuits. The source for VCCSYN should be a quiet power supply with adequate external bypass capacitors placed as close as possible to the VCCSYN pin to ensure a stable operating frequency. Figure 4-4 shows typical values for the bypass and PLL external capacitors. The crystal manufacturer's documentation should be consulted for specific recommendations for external components. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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