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CP2201 Datasheet(PDF) 19 Page - Silicon Laboratories |
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CP2201 Datasheet(HTML) 19 Page - Silicon Laboratories |
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19 / 108 page  CP2200/1 Rev. 1.0 19 6.4. Clocking Options The CP2200/1 can be clocked from an external parallel-mode crystal oscillator or CMOS clock. Figure 10 and Figure 11 show typical connections for both clock source types. If a crystal oscillator is chosen to clock the device, the crystal is started once the device is released from reset and remains on until the device reenters the reset state or loses power. Figure 10. Crystal Oscillator Example Important note on external crystals: Crystal oscillator circuits are quite sensitive to PCB layout. The crystal should be placed as close as possible to the XTAL pins on the device. The traces should be as short as possible and shielded with a ground plane from any other traces that could introduce noise or interference. Figure 11. External CMOS Clock Example Table 7 lists the clocking requirements of the CP2200/1 when using a crystal oscillator or CMOS clock. Table 8 shows the electrical characteristics of the XTAL1 pin. These characteristics are useful when selecting an external CMOS clock. XTAL1 XTAL2 10 M Ω 20 MHz XTAL1 XTAL2 No Connect 20 MHz CMOS Clock |
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