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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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COM20020D датащи(PDF) 48 Page - SMSC Corporation |
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COM20020D датащи(HTML) 48 Page - SMSC Corporation |
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48 / 72 page  48 If an external crystal is used, two capacitors are needed (one from each leg of the crystal to ground). No external resistor is required, since the COM20020D contains an internal resistor. The crystal must have an accuracy of 0.020% or better. The oscillation frequency range is from 10 MHz to 20 MHz. The crystal must have an accuracy of 0.010% or better when the internal clock multiplier is turned on. The oscillation frequency must be 20MHz when the internal clock multiplier is turned on. The XTAL2 side of the crystal may be loaded with a single 74HC-type buffer in order to generate a clock for other devices. The user may attach an external TTL clock, rather than a crystal, to the XTAL1 signal. In this case, a 390 Ω pull-up resistor is required on XTAL1, while XTAL2 should be left unconnected. |
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