ATMEGA48-15AZV データシートの表示（PDF） - Atmel Corporation

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ATMEGA48-15AZV

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

Atmel Corporation 

Atmel ATmega48/88/168 Automotive

Figure 6-3. Crystal Oscillator Connections

C2

C1

XTAL2

XTAL1

GND

Table 6-6. Start-up Times for the Full Swing Crystal Oscillator Clock Selection

Oscillator Source /

Power Conditions

Ceramic resonator, fast

rising power

Start-up Time from

Power-down and

Power-save

258 CK

Additional Delay

from Reset

(VCC = 5.0V)

14CK + 4.1 ms(1)

CKSEL0

0

Ceramic resonator, slowly

rising power

258 CK

14CK + 65 ms(1)

0

Ceramic resonator, BOD

enabled

1K CK

14CK(2)

0

Ceramic resonator, fast

rising power

1K CK

14CK + 4.1 ms(2)

0

Ceramic resonator, slowly

rising power

1K CK

14CK + 65 ms(2)

1

Crystal Oscillator, BOD

enabled

16K CK

14CK

1

Crystal Oscillator, fast

rising power

16K CK

14CK + 4.1 ms

1

Crystal Oscillator, slowly

rising power

16K CK

14CK + 65 ms

1

SUT1..0

00

01

10

11

00

01

10

11

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.

29

7530J–AVR–03/12

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