Rainbow-electronics AT90LS4433 Instrukcja Użytkownika Pobierz pdf (Strona 6)

AT90S/LS4433

1042G–AVR–09/02

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 5

MAX 1 HC BUFFER

XTAL2

1 2 3 4 5 6 7 8 9 10 11 ... 124 125

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Rainbow-electronics AT90LS4433 Instrukcja Użytkownika Strona 6