ATmega16 datasheet(25/315 Pages) ATMEL

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ATmega16(L)

2466E–AVR–10/02

The CKSEL0 Fuse together with the SUT1..0 fuses select the start-up times as shown in

Table 5.

Notes:

1. These options should only be used when not operating close to the maximum fre-

quency 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 fre-

quency stability at start-up. They can also be used with crystals when not operating

close to the maximum frequency of the device, and if frequency stability at start-up is

not important for the application.

Table 5. 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

000

258 CK

(1)

4.1 ms

Ceramic resonator, fast

rising power

001

258 CK

(1)

65 ms

Ceramic resonator, slowly

rising power

010

1K CK

(2)

–

Ceramic resonator, BOD

enabled

011

1K CK

(2)

4.1 ms

Ceramic resonator, fast

rising power

100

1K CK

(2)

65 ms

Ceramic resonator, slowly

rising power

16K CK

–

Crystal Oscillator, BOD

enabled

16K CK

4.1 ms

Crystal Oscillator, fast

rising power

16K CK

65 ms

Crystal Oscillator, slowly

rising power

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