ATMEGA329P_1 datasheet(32/385 Pages) ATMEL

Nome de Peças	ATMEGA329P

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

PDF	385 Pages

Scroll/Zoom	100%

Fabricante Electrônico	ATMEL [ATMEL Corporation]

Página de início	http://www.atmel.com

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32 / 385 page

32

8021E–AVR–07/09

ATmega329P/3290P

When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in

Table 8-9 on page 32.

Note:

1. The device is shipped with this option selected

.

8.7

External Clock

To drive the device from an external clock source, XTAL1 should be driven as shown in Figure

8-3 on page 32. To run the device on an external clock, the CKSEL Fuses must be programmed

to “0000”.

Figure 8-3.

External Clock Drive Configuration

When this clock source is selected, start-up times are determined by the SUT Fuses as shown in

Table 8-11 on page 32.

Table 8-9.

Start-up times for the internal calibrated RC Oscillator clock selection

Power Conditions

Start-up Time from Power-

down and Power-save

Additional Delay from

Reset (V

CC = 5.0V)

SUT1..0

BOD enabled

6 CK

14CK

00

Fast rising power

6 CK

14CK + 4.1 ms

01

Slowly rising power

6 CK

14CK + 65 ms(1)

10

Reserved

11

Table 8-10.

Crystal Oscillator Clock Frequency

CKSEL3..0

Frequency Range

0000

0 - 16 MHz

Table 8-11.

Start-up Times for the External Clock Selection

SUT1..0

Start-up Time from Power-

down and Power-save

Additional Delay from

Reset (V

CC = 5.0V)

Recommended Usage

00

6 CK

14CK

BOD enabled

01

6 CK

14CK + 4.1 ms

Fast rising power

10

6 CK

14CK + 65 ms

Slowly rising power

11

Reserved

NC

EXTERNAL

CLOCK

SIGNAL

XTAL2

XTAL1

GND

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