44
9140CINDCO02/10
ATA8741
Notes: 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.
14.5 Low-frequency Crystal Oscillator
To use a 32.768 kHz watch crystal as the clock source for the device, the low-frequency crystal
oscillator must be selected by setting CKSEL fuses to 0110. The crystal should be connected
as shown in Figure 14-2. See the 32 kHz Crystal Oscillator Application Note for details on oscil-
lator operation and how to choose appropriate values for C1 and C2.
When this oscillator is selected, start-up times are determined by the SUT fuses as shown in
Table 14-5.
Notes: 1. These options should only be used if frequency stability at start-up is not important for the
application.
Table 14-4. Start-up Times for the Crystal Oscillator Clock Selection
CKSEL0
SUT1..0
Start-up Time from
Power-down and
Power-save
Additional Delay
from Reset
(V
CC
= 5.0V)
Recommended Usage
0
00
258 CK
(1)
14CK + 4.1 ms
Ceramic resonator, fast
rising power
0
01
258 CK
(1)
14CK + 65 ms
Ceramic resonator, slowly
rising power
0
10
1K CK
(2)
14CK
Ceramic resonator, BOD
enabled
0
11
1K CK
(2)
14CK + 4.1 ms
Ceramic resonator, fast
rising power
1
00
1K CK
(2)
14CK + 65 ms
Ceramic resonator, slowly
rising power
1
01
16K CK
14CK
Crystal Oscillator, BOD
enabled
1
10
16K CK
14CK + 4.1 ms
Crystal Oscillator, fast
rising power
1
11
16K CK
14CK + 65 ms
Crystal Oscillator, slowly
rising power
Table 14-5. Start-up Times for the Low Frequency Crystal Oscillator Clock Selection
SUT1..0
Start-up Time from
Power Down and Power
Save
Additional Delay from
Reset (V
CC
= 5.0V)
Recommended usage
00
1K CK
(1)
4 ms
Fast rising power or BOD
enabled
01
1K CK
(1)
64 ms
Slowly rising power
10
32K CK
64 ms
Stable frequency at start-up
11
Reserved
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