ATMEGA323L-4AI datasheet(27/247 Pages) ATMEL

27 / 247 page

ATmega323(L)

1457G–AVR–09/03

Notes:

1. On Power-up, the start-up time is increased with Typ 0.6 ms.

2. “1” means unprogrammed, “0” means programmed.

3. For possible clock selections, see “Clock Options” on page 6.

4. When BODEN is programmed, add 100 µs.

5. When BODEN is programmed, add 25 µs.

6. Default value.

Table 6. Reset Delay Selections

(1)

CKSEL(2)

Start-up Time, V

CC =

2.7V, BODLEVEL

Unprogrammed

Start-up Time, V

CC =

4.0V, BODLEVEL

Programmed

Recommended Usage(3)

0000

4.2 ms + 6 CK

5.8 ms + 6 CK

Ext. Clock, Fast Rising

Power

0001

30 µs + 6 CK(4)

10 µs + 6 CK(5)

Ext. Clock, BOD Enabled

0010(6)

67 ms + 6 CK

92 ms + 6 CK

Int. RC Oscillator, Slowly

Rising Power

0011

4.2 ms + 6 CK

5.8 ms + 6 CK

Int. RC Oscillator, Fast

Rising Power

0100

30 µs + 6 CK(4)

10 µs + 6 CK(5)

Int. RC Oscillator, BOD

Enabled

0101

67 ms + 6 CK

92 ms + 6 CK

Ext. RC Oscillator, Slowly

Rising Power

0110

4.2 ms + 6 CK

5.8 ms + 6 CK

Ext. RC Oscillator, Fast

Rising Power

0111

30 µs + 6 CK(4)

10 µs + 6 CK(5)

Ext. RC Oscillator, BOD

Enabled

1000

67 ms + 32K CK

92 ms + 32K CK

Ext. Low-frequency

Crystal

1001

67 ms + 1K CK

92 ms + 1K CK

Ext. Low-frequency

Crystal

1010

67 ms + 16K CK

92 ms + 16K CK

Crystal Oscillator, Slowly

Rising Power

1011

4.2 ms + 16K CK

5.8 ms + 16K CK

Crystal Oscillator, Fast

Rising Power

1100

30 µs + 16K CK(4)

10 µs + 16K CK(5)

Crystal Oscillator, BOD

Enabled

1101

67 ms 1K CK

92 ms + 1K CK

Ceramic Resonator/Ext.

Clock, Slowly Rising

Power

1110

4.2 ms + 1K CK

5.8 ms + 1K CK

Ceramic Resonator, Fast

Rising Power

1111

30 µs + 1K CK(4)

10 µs + 1K CK(5)

Ceramic Resonator, BOD

Enabled

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