ATmega16(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
Start-up Time from Additional Delay
Power-down and
Power-save
from Reset
(VCC = 5.0V)
CKSEL0 SUT1..0
Recommended Usage
Ceramic resonator, fast
rising power
0
0
0
0
1
1
1
1
00
01
10
11
00
01
10
11
258 CK(1)
258 CK(1)
1K CK(2)
1K CK(2)
1K CK(2)
16K CK
16K CK
16K CK
4.1 ms
65 ms
–
Ceramic resonator, slowly
rising power
Ceramic resonator, BOD
enabled
Ceramic resonator, fast
rising power
4.1 ms
65 ms
–
Ceramic resonator, slowly
rising power
Crystal Oscillator, BOD
enabled
Crystal Oscillator, fast
rising power
4.1 ms
65 ms
Crystal Oscillator, slowly
rising power
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.
25
2466E–AVR–10/02
ATMEL [ ATMEL ]
