AT90S8535 datasheet(6/127 Pages) ATMEL | 8-bit Microcontroller with 8K Bytes In-System Programmable Flash

Part #	AT90S8535

Description	8-bit Microcontroller with 8K Bytes In-System Programmable Flash

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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6

AT90S/LS8535

1041H–11/01

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. Either a quartz

crystal or a ceramic resonator may be used.

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.

External Clock

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.

XTAL2

XTAL1

GND

C2

C1

MAX 1 HC BUFFER

HC

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