Datasheet

27
ATmega323(L)
1457E–11/01
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