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ATMEGA161 Datasheet(PDF) 5 Page - ATMEL Corporation |
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5 page 
ATmega161(L) 5 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. To drive the device from an external clock source, XTAL2 should be left unconnected while XTAL1 is driven as shown in Figure 3. 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. Figure 3. External Clock Drive Configuration XTAL2 XTAL1 GND C2 C1 MAX 1 HC BUFFER HC |
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