ATmega162 datasheet(37/324 Pages) ATMEL

37 / 324 page

2513K–AVR–07/09

ATmega162/V

Figure 19. Crystal Oscillator Connections

The Oscillator can operate in four different modes, each optimized for a specific frequency

range. The operating mode is selected by the fuses CKSEL3:1 as shown in Table 7.

Note:

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

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

Table 7. Crystal Oscillator Operating Modes

CKSEL3:1

Frequency Range

(MHz)

Recommended Range for Capacitors C1 and

C2 for Use with Crystals (pF)

100(1)

0.4 - 0.9

–

101

0.9 - 3.0

12 - 22

110

3.0 - 8.0

12 - 22

111

8.0 -

12 - 22

Table 8. Start-up Times for the Crystal Oscillator Clock Selection

CKSEL0

SUT1:0

Start-up Time from

Power-down and

Power-save

Additional Delay from

Reset (VCC = 5.0V)

Recommended

Usage

258 CK(1)

4.1 ms

Ceramic resonator,

fast rising power

258 CK(1)

65 ms

Ceramic resonator,

slowly rising power

010

1K CK(2)

–

Ceramic resonator,

BOD enabled

011

1K CK(2)

4.1 ms

Ceramic resonator,

fast rising power

100

1K CK(2)

65 ms

Ceramic resonator,

slowly rising power

16K CK

–

Crystal Oscillator,

BOD enabled

16K CK

4.1 ms

Crystal Oscillator,

fast rising power

16K CK

65 ms

Crystal Oscillator,

slowly rising power

XTAL2

XTAL1

GND

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