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

Part # ATMEGA6450/V
Description  8-bit Microcontroller with In-System Programmable Flash
PDF  347 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

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

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27
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
(V
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
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
XTAL2
XTAL1
GND
C2
C1



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