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AT89C2051-24SU Folha de dados(PDF) 4 Page - ATMEL Corporation |
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AT89C2051-24SU Folha de dados(HTML) 4 Page - ATMEL Corporation |
4 / 19 page 4 0368H–MICRO–6/08 AT89C2051 4.7 XTAL2 Output from the inverting oscillator amplifier. 5. Oscillator Characteristics The XTAL1 and XTAL2 are the input and output, respectively, of an inverting amplifier which can be configured for use as an on-chip oscillator, as shown in Figure 5-1. 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 5-2. There are no require- ments 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 5-1. Oscillator Connections Note: C1, C2 = 30 pF ± 10 pF for Crystals = 40 pF ± 10 pF for Ceramic Resonators Figure 5-2. External Clock Drive Configuration |
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