Figure 19, Table 7, Atmega162/v – Rainbow Electronics ATmega162V User Manual
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ATmega162/V
2513E–AVR–09/03
Figure 19. Crystal Oscillator Connections
The Oscillator can operate in four different modes, each optimized for a specific fre-
quency range. The operating mode is selected by the fuses CKSEL3:1 as shown in
Table 7.
Note:
1. This option should not be used with crystals, only with ceramic resonators.
The CKSEL0 Fuse together with the SUT1..0 Fuses select the start-up times as shown
in Table 8.
Table 7. Crystal Oscillator Operating Modes
CKSEL3:1
Frequency Range
(MHz)
Recommended Range for Capacitors C1 and
C2 for Use with Crystals (pF)
100
0.4 - 0.9
–
101
0.9 - 3.0
12 - 22
110
3.0 - 8.0
12 - 22
111
8.0 -
12 - 22
Table 8. 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
4.1 ms
Ceramic resonator,
fast rising power
0
01
258 CK
65 ms
Ceramic resonator,
slowly rising power
0
10
1K CK
–
Ceramic resonator,
BOD enabled
0
11
1K CK
4.1 ms
Ceramic resonator,
fast rising power
1
00
1K CK
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
XTAL2
XTAL1
GND
C2
C1