ATMEGA32(2008) 데이터 시트보기 (PDF) - Atmel Corporation

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ATMEGA32
(Rev.:2008)

8-bit Microcontroller with 32K Bytes In-System Programmable Flash

Atmel Corporation 

ATmega32(L)

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

5.

Table 5. Start-up Times for the Crystal Oscillator Clock Selection

CKSEL0

0

SUT1..0

00

Start-up Time from

Power-down and

Power-save

258 CK(1)

Additional Delay

from Reset

(VCC = 5.0V)

4.1 ms

Recommended Usage

Ceramic resonator, fast

rising power

0

01

258 CK(1)

65 ms

Ceramic resonator, slowly

rising power

0

10

1K CK(2)

–

Ceramic resonator, BOD

enabled

0

11

1K CK(2)

4.1 ms

Ceramic resonator, fast

rising power

1

00

1K CK(2)

65 ms

Ceramic resonator, slowly

rising power

1

01

16K CK

–

Crystal Oscillator, BOD

enabled

1

10

16K CK

4.1 ms

Crystal Oscillator, fast

rising power

1

Notes:

11

16K CK

65 ms

Crystal Oscillator, slowly

rising power

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.

27

2503N–AVR–06/08

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