ATMEGA323 Просмотр технического описания (PDF) - Atmel Corporation

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производитель

ATMEGA323

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

Atmel Corporation 

External Clock

ATmega323(L)

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

VCC

R

NC

C

XTAL2

XTAL1

GND

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.

7

1457G–AVR–09/03

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