ATMEGA32 View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'ATMEGA32' PDF : 346 Pages View PDF
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
11
16K CK
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.
27
2503J–AVR–10/06
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