ATMEGA323-8PI datasheet(6/247 Pages) ATMEL

Part #	ATMEGA323-8PI

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

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Manufacturer	ATMEL [ATMEL Corporation]

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6

ATmega323(L)

1457G–AVR–09/03

Clock Options

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

shown:

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.

Internal RC Oscillator

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.

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

Table 1. Device Clocking Options Select

(1)

Device Clocking Option

CKSEL3..0

External Crystal/Ceramic Resonator

1111 - 1010

External Low-frequency Crystal

1001 - 1000

External RC Oscillator

0111 - 0101

Internal RC Oscillator

0100 - 0010

External Clock

0001 - 0000

XTAL2

XTAL1

GND

C2

C1

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