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ATmega128
External RC
Oscillator
For timing insensitive applications, the External RC configuration shown in Figure 20 can be
used. The frequency is roughly estimated by the equation f = 1/(3RC). C should be at least
22pF. By programming the CKOPT fuse, the user can enable an internal 36pF capacitor
between XTAL1 and GND, thereby removing the need for an external capacitor. For more infor-
mation on Oscillator operation and details on how to choose R and C, refer to the External RC
Oscillator application note.
Figure 20. External RC Configuration
V CC
R
NC
XTAL2
XTAL1
C
GND
The Oscillator can operate in four different modes, each optimized for a specific frequency
range. The operating mode is selected by the fuses CKSEL3..0 as shown in Table 11 .
Table 11. External RC Oscillator Operating Modes
CKSEL3..0
0101
0110
0111
1000
Frequency Range (MHz)
0.1 - 0.9
0.9 - 3.0
3.0 - 8.0
8.0 - 12.0
W hen this Oscillator is selected, start-up times are determined by the SUT fuses as shown in
Table 12 .
Table 12. Start-Up Times for the External RC Oscillator Clock Selection
Start-up Time from
Power-down and
Additional Delay
from Reset
6 CK
SUT1..0
00
01
10
11
Power-save
18 CK
18 CK
18 CK
(1)
(V CC = 5.0V)
–
4.1ms
65ms
4.1ms
Recommended Usage
BOD enabled
Fast rising power
Slowly rising power
Fast rising power or BOD enabled
Note:
1. This option should not be used when operating close to the maximum frequency of the device.
40
2467X–AVR–06/11
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