ATMEGA323-8AC datasheet(7/247 Pages) ATMEL

Part #	ATMEGA323-8AC

Description	8-bit Microcontroller with 32K Bytes of In-System Programmable Flash

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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7

ATmega323(L)

1457G–AVR–09/03

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 73 on page 215.

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 external capacitors are needed. The Oscillator is opti-

mized for use with a 32.768 kHz watch crystal. Applying an external clock source to

PC6(TOSC1) is not recommended.

XTAL2

XTAL1

GND

C

R

VCC

NC

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