ATmega328P datasheet(31/448 Pages) ATMEL

31 / 448 page

8161D–AVR–10/09

ATmega48PA/88PA/168PA/328P

Figure 8-3.

Crystal Oscillator Connections

Notes:

1. These options should only be used when not operating close to the maximum frequency of the

device, and only if frequency stability at start-up is not important for the application. These

options are not suitable for crystals.

2. These options are intended for use with ceramic resonators and will ensure frequency stability

at start-up. They can also be used with crystals when not operating close to the maximum fre-

quency of the device, and if frequency stability at start-up is not important for the application.

Table 8-6.

Start-up Times for the Full Swing Crystal Oscillator Clock Selection

Oscillator Source /

Power Conditions

Start-up Time from

Power-down and

Power-save

Additional Delay

from Reset

CC = 5.0V)

CKSEL0

SUT1..0

Ceramic resonator, fast

rising power

258 CK

14CK + 4.1 ms(1)

000

Ceramic resonator, slowly

rising power

258 CK

14CK + 65 ms(1)

001

Ceramic resonator, BOD

enabled

1K CK

14CK(2)

010

Ceramic resonator, fast

rising power

1K CK

14CK + 4.1 ms(2)

011

Ceramic resonator, slowly

rising power

1K CK

14CK + 65 ms(2)

100

Crystal Oscillator, BOD

enabled

16K CK

14CK

Crystal Oscillator, fast

rising power

16K CK

14CK + 4.1 ms

Crystal Oscillator, slowly

rising power

16K CK

14CK + 65 ms

XTAL2 (TOSC2)

XTAL1 (TOSC1)

GND

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