Rainbow-electronics ATtiny861_V Instrukcja Użytkownika Pobierz pdf (Strona 30)

2588B–AVR–11/06

ATtiny261/461/861

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.

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

= 5.0V) Recommended Usage

0 00 258 CK

(1)

14CK + 4.1 ms

Ceramic resonator, fast

rising power

0 01 258 CK

(1)

14CK + 65 ms

Ceramic resonator, slowly

rising power

0 10 1K (1024) CK

(2)

14CK

Ceramic resonator, BOD

enabled

0 11 1K (1024)CK

(2)

14CK + 4.1 ms

Ceramic resonator, fast

rising power

1 00 1K (1024)CK

(2)

14CK + 65 ms

Ceramic resonator, slowly

rising power

1 01 16K (16384) CK 14CK

Crystal Oscillator, BOD

enabled

1 10 16K (16384) CK 14CK + 4.1 ms

Crystal Oscillator, fast

rising power

1 11 16K (16384) CK 14CK + 65 ms

Crystal Oscillator, slowly

rising power

XTAL2

XTAL1

GND

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 235 236

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