ATtiny261-ESSZ datasheet(31/227 Pages) ATMEL

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7753C–AVR–07/09

ATtiny261/ATtiny461/ATtiny861

Figure 7-4.

Crystal Oscillator Connections

The Oscillator can operate in three different modes, each optimized for a specific frequency

range. The operating mode is selected by the fuses CKSEL3..1 as shown in Table 7-10.

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

7-11.

Notes:

1. These options should only be used when not operating close to the maximum frequency of the

device, and only if frequency stability at start-up is not important for the application. These

options are not suitable for crystals.

2. These options are intended for use with ceramic resonators and will ensure frequency stability

at start-up. They can also be used with crystals when not operating close to the maximum fre-

quency of the device, and if frequency stability at start-up is not important for the application.

Table 7-10.

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 7-11.

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

(VCC = 5.0V)

Recommended Usage

258 CK(1)

14CK + 4.1 ms

Ceramic resonator, fast

rising power

258 CK(1)

14CK + 65 ms

Ceramic resonator, slowly

rising power

1K (1024) CK(2)

14CK

Ceramic resonator, BOD

enabled

1K (1024)CK(2)

14CK + 4.1 ms

Ceramic resonator, fast

rising power

1K (1024)CK(2)

14CK + 65 ms

Ceramic resonator, slowly

rising power

16K (16384) CK

14CK

Crystal Oscillator, BOD

enabled

16K (16384) CK

14CK + 4.1 ms

Crystal Oscillator, fast rising

power

16K (16384) CK

14CK + 65 ms

Crystal Oscillator, slowly

rising power

XTAL2

XTAL1

GND

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