Rainbow-electronics ATmega163L Instrukcja Użytkownika Pobierz pdf (Strona 6)

ATmega163(L)

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

External Clock

To drive the device from an external clock source, XTAL1 should be driven as shown in Figure 3.

Figure 3. External Clock Drive Configuration

External RC Oscillator

For timing insensitive applications, the external RC configuration shown in Figure 4 can be used. For details on how to

choose R and C, see Table 63 on page 140.

Figure 4. External RC Configuration

Timer Oscillator

For the Timer Oscillator pins, PC6(TOSC1) and PC7(TOSC2), the crystal is connected directly between the pins. No exter-

nal capacitors are needed. The oscillator is optimized for use with a 32,768 Hz watch crystal. Applying an external clock

source to the PC6 (TOSC1) pin is not recommended.

XTAL2

XTAL1

GND

1 2 3 4 5 6 7 8 9 10 11 ... 155 156

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Rainbow-electronics ATmega163L Instrukcja Użytkownika Strona 6