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ATMEGA8515 Datasheet(PDF) 36 Page - ATMEL Corporation

Part # ATMEGA8515
Description  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
Download  257 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA8515 Datasheet(HTML) 36 Page - ATMEL Corporation

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36
ATmega8515(L)
2512K–AVR–01/10
in use, the amount of stray capacitance, and the electromagnetic noise of the environ-
ment. Some initial guidelines for choosing capacitors for use with crystals are given in
Table 7. For ceramic resonators, the capacitor values given by the manufacturer should
be used.
Figure 19. Crystal Oscillator Connections
The Oscillator can operate in three 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
CKOPT
CKSEL3..1
Frequency Range
(MHz)
Recommended Range for Capacitors
C1 and C2 for Use with Crystals (pF)
1
101(1)
0.4 - 0.9
–
1
110
0.9 - 3.0
12 - 22
1
111
3.0 - 8.0
12 - 22
0
101, 110, 111
1.0
≤
12 - 22
Table 8. Start-up Times for the Crystal Oscillator Clock Selection
CKSEL0
SUT1..0
Start-up Time
from Power-down
Additional Delay from
Reset (V
CC = 5.0V)
Recommended
Usage
0
00
258 CK(1)
4.1 ms
Ceramic resonator,
fast rising power
0
01
258 CK(1)
65 ms
Ceramic resonator,
slowly rising power
010
1K CK(2)
–
Ceramic resonator,
BOD enabled
011
1K CK(2)
4.1 ms
Ceramic resonator,
fast rising power
100
1K CK(2)
65 ms
Ceramic resonator,
slowly rising power
XTAL2
XTAL1
GND
C2
C1


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