ATMEGA6450SLASHV datasheet(27/347 Pages) ATMEL

27 / 347 page

ATmega325/3250/645/6450

2570A–AVR–09/04

Figure 13. Crystal Oscillator Connections

The 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 5.

Notes:

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 6.

Table 5. 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 6. 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

CC = 5.0V)

Recommended

Usage

000

258 CK(1)

14CK + 4.1 ms

Ceramic resonator,

fast rising power

001

258 CK(1)

14CK + 65 ms

Ceramic resonator,

slowly rising power

010

1K CK(2)

14CK

Ceramic resonator,

BOD enabled

011

1K CK(2)

14CK + 4.1 ms

Ceramic resonator,

fast rising power

100

1K CK(2)

14CK + 65 ms

Ceramic resonator,

slowly rising power

16K CK

14CK

Crystal Oscillator,

BOD enabled

16K CK

14CK + 4.1 ms

Crystal Oscillator, fast

rising power

16K CK

14CK + 65 ms

Crystal Oscillator,

slowly rising power

XTAL2

XTAL1

GND

ATMEGA6450/V 데이터시트(PDF) 27 Page - ATMEL Corporation

ATMEGA6450/V 데이터시트(HTML) 27 Page - ATMEL Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

데이터시트 다운로드

링크 URL