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AT90S8515

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

Atmel Corporation 

Crystal Oscillator

XTAL1 and XTAL2 are input and output, respectively, of an inverting amplifier that 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

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.

Figure 3. External Clock Drive Configuration

6 AT90S8515

0841G–09/01

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