ATMEGA323 Ver la hoja de datos (PDF) - Atmel Corporation

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Fabricante

ATMEGA323

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

Atmel Corporation 

Clock Options

Internal RC Oscillator

Crystal Oscillator

The device has the following clock source options, selectable by Flash Fuse bits as

shown:

Table 1. Device Clocking Options Select(1)

Device Clocking Option

External Crystal/Ceramic Resonator

External Low-frequency Crystal

External RC Oscillator

Internal RC Oscillator

External Clock

CKSEL3..0

1111 - 1010

1001 - 1000

0111 - 0101

0100 - 0010

0001 - 0000

Note: 1. “1” means unprogrammed, “0” means programmed.

The various choices for each clocking option give different start-up times as shown in

Table 6 on page 27.

The internal RC Oscillator option is an On-chip Oscillator running at a fixed frequency of

nominally 1 MHz. If selected, the device can operate with no external components. See

“Calibrated Internal RC Oscillator” on page 41 for information on calibrating this

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

C2

XTAL2

C1

XTAL1

GND

6 ATmega323(L)

1457G–AVR–09/03

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