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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AT89 датащи(PDF) 21 Page - ATMEL Corporation |
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AT89 датащи(HTML) 21 Page - ATMEL Corporation |
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21 / 41 page  21 AT89S8252 0401F–MICRO–11/03 Oscillator Characteristics XTAL1 and XTAL2 are the input and output, respectively, of an inverting amplifier that can be configured for use as an on-chip oscillator, as shown in Figure 11. Either a quartz crystal or ceramic resonator may be used. To drive the device from an external clock source, XTAL2 should be left unconnected while XTAL1 is driven, as shown in Figure 12. There are no requirements on the duty cycle of the external clock signal, since the input to the internal clocking circuitry is through a divide-by-two flip-flop, but minimum and maximum voltage high and low time specifications must be observed. Figure 11. Oscillator Connections Note: C1, C2 = 30 pF ± 10 pF for Crystals = 40 pF ± 10 pF for Ceramic Resonators Figure 12. External Clock Drive Configuration |
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