ATMEGA6450-16AI(2004) 데이터 시트보기 (PDF) - Atmel Corporation
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ATMEGA6450-16AI Datasheet PDF : 347 Pages
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2570A–AVR–09/04
ATmega325/3250/645/6450
Figure 13. Crystal Oscillator Connections
C2
C1
XTAL2
XTAL1
GND
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.
Table 5. Crystal Oscillator Operating Modes
CKSEL3..1
100(1)
Frequency Range
(MHz)
0.4 - 0.9
Recommended Range for Capacitors C1
and C2 for Use with Crystals (pF)
–
101
0.9 - 3.0
12 - 22
110
3.0 - 8.0
12 - 22
111
8.0 -
12 - 22
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 6. Start-up Times for the Crystal Oscillator Clock Selection
CKSEL0 SUT1..0
0
00
Start-up Time from
Power-down and
Power-save
258 CK(1)
0
01
258 CK(1)
0
10
1K CK(2)
0
11
1K CK(2)
1
00
1K CK(2)
Additional Delay
from Reset
(VCC = 5.0V)
14CK + 4.1 ms
14CK + 65 ms
14CK
14CK + 4.1 ms
14CK + 65 ms
Recommended
Usage
Ceramic resonator,
fast rising power
Ceramic resonator,
slowly rising power
Ceramic resonator,
BOD enabled
Ceramic resonator,
fast rising power
Ceramic resonator,
slowly rising power
1
01
16K CK
14CK
Crystal Oscillator,
BOD enabled
1
10
16K CK
14CK + 4.1 ms
Crystal Oscillator, fast
rising power
1
11
16K CK
14CK + 65 ms
Crystal Oscillator,
slowly rising power
27
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