ATmega16 datasheet(24/315 Pages) ATMEL

tên linh kiện	ATMEGA16

Giải thích chi tiết về linh kiện	8-bit AVR Microcontroller with 16K Bytes In-System Programmable Flash

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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)

101

(1)

0.4 - 0.9

–

110

0.9 - 3.0

12 - 22

111

3.0 - 8.0

12 - 22

101, 110, 111

1.0

≤

12 - 22

XTAL2

XTAL1

GND

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