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AT90LS8535-4AI bảng dữ liệu(PDF) 6 Page - ATMEL Corporation |
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AT90LS8535-4AI bảng dữ liệu(HTML) 6 Page - ATMEL Corporation |
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6 / 127 page ![]() 6 AT90S/LS8535 1041H–11/01 Clock Options Crystal Oscillator XTAL1 and XTAL2 are input and output, respectively, of an inverting amplifier which can be configured for use as an on-chip oscillator, as shown in Figure 2. Either a quartz crystal or a ceramic resonator may be used. Figure 2. Oscillator Connections Note: When using the MCU Oscillator as a clock for an external device, an HC buffer should be connected as indicated in the figure. External Clock To drive the device from an external clock source, XTAL2 should be left unconnected while XTAL1 is driven as shown in Figure 3. Figure 3. External Clock Drive Configuration Timer Oscillator For the Timer Oscillator pins, TOSC1 and TOSC2, the crystal is connected directly between the pins. No external capacitors are needed. The oscillator is optimized for use with a 32,768 Hz watch crystal. Applying an external clock source to TOSC1 is not recommended. XTAL2 XTAL1 GND C2 C1 MAX 1 HC BUFFER HC |
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