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AT90LS4433-4AI Datasheet(PDF) 6 Page - ATMEL Corporation |
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AT90LS4433-4AI Datasheet(HTML) 6 Page - ATMEL Corporation |
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6 / 126 page  6 AT90S/LS4433 1042H–AVR–04/03 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 and Figure 3. Either a quartz crystal or a ceramic resonator may be used. External Clock If the Oscillator is to be used as a clock for an external device, the clock signal from XTAL2 may be routed to one HC buffer while reducing the load capacitor by 5 pF, as shown in Figure 3. To drive the device from an external clock source, XTAL2 should be left unconnected while XTAL1 is driven as shown in Figure 4. Figure 2. Oscillator Connections Figure 3. Using MCU Oscillator as a Clock for an External Device Figure 4. External Clock Drive Configuration XTAL1 REDUCE BY 5PF MAX 1 HC BUFFER XTAL2 |
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