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 6-2. Crystal Oscillator Connections

C2

C1

XTAL2

XTAL1

GND

The Low Power Oscillator can operate in three different modes, each optimized for a specific fre-

quency range. The operating mode is selected by the fuses CKSEL3..1 as shown in Table 6-3

on page 27.

Table 6-3. Low Power Crystal Oscillator Operating Modes(3)

Frequency Range(1) (MHz)

0.4 - 0.9

CKSEL3..1

100(2)

Recommended Range for Capacitors C1

and C2 (pF)

–

0.9 - 3.0

101

12 - 22

3.0 - 8.0

110

12 - 22

8.0 - 16.0

111

12 - 22

Notes: 1. The frequency ranges are preliminary values. Actual values are TBD.

2. This option should not be used with crystals, only with ceramic resonators.

3. If 8 MHz frequency exceeds the specification of the device (depends on VCC), the CKDIV8

Fuse can be programmed in order to divide the internal frequency by 8. It must be ensured

that the resulting divided clock meets the frequency specification of the device.

The CKSEL0 Fuse together with the SUT1..0 Fuses select the start-up times as shown in Table

6-4.

Table 6-4. Start-up Times for the Low Power 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

SUT1..0

00

01

10

11

00

27

7530J–AVR–03/12

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