ATmega16 datasheet(27/357 Pages) ATMEL

27 / 357 page

2466S–AVR–05/09

ATmega16(L)

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

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 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

CC = 5.0V)

Recommended Usage

258 CK(1)

4.1 ms

Ceramic resonator, fast

rising power

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

101

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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