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ATMEGA16-16MC Datasheet(PDF) 24 Page - ATMEL Corporation

Part No. ATMEGA16-16MC
Description  8-bit AVR Microcontroller with 16K Bytes In-System Programmable Flash
Download  315 Pages
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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ATMEGA16-16MC Datasheet(HTML) 24 Page - ATMEL Corporation

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24
ATmega16(L)
2466E–AVR–10/02
and resonators. The optimal value of the capacitors depends on the crystal or resonator
in use, the amount of stray capacitance, and the electromagnetic noise of the environ-
ment. Some initial guidelines for choosing capacitors for use with crystals are given in
Table 4. For ceramic resonators, the capacitor values given by the manufacturer should
be used. For more information on how to choose capacitors and other details on Oscilla-
tor operation, refer to the Multi-purpose Oscillator application note.
Figure 12. 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 4.
Note:
1. This option should not be used with crystals, only with ceramic resonators.
Table 4. Crystal Oscillator Operating Modes
CKOPT
CKSEL3..1
Frequency Range
(MHz)
Recommended Range for Capacitors
C1 and C2 for Use with Crystals (pF)
1
101
(1)
0.4 - 0.9
1
110
0.9 - 3.0
12 - 22
1
111
3.0 - 8.0
12 - 22
0
101, 110, 111
1.0
12 - 22
XTAL2
XTAL1
GND
C2
C1


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