AT90LS8535-4MC データシートの表示（PDF） - Atmel Corporation

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AT90LS8535-4MC

8-Bit AVR® Microcontroller with 4K/8K Bytes In-System Programmable Flash

Atmel Corporation 

Clock Options

Crystal Oscillator

External Clock

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

MAX 1 HC BUFFER

HC

C2

XTAL2

C1

XTAL1

GND

Note: When using the MCU Oscillator as a clock for an external device, an HC buffer should be

connected as indicated in the figure.

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.

6 AT90S/LS8535

1041H–11/01

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