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ATmega128-16AU Scheda tecnica(PDF) 40 Page - ATMEL Corporation

Il numero della parte ATmega128-16AU
Spiegazioni elettronici  8-bit Microcontroller with 128K Bytes In-System Programmable Flash
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Produttore elettronici  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega128-16AU Scheda tecnica(HTML) 40 Page - ATMEL Corporation

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2467S–AVR–07/09
ATmega128
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.
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 the CKSEL fuses to “1001”. The crystal should be con-
nected as shown in Figure 19. By programming the CKOPT fuse, the user can enable internal
capacitors on XTAL1 and XTAL2, thereby removing the need for external capacitors. The inter-
nal capacitors have a nominal value of 36 pF.
When this Oscillator is selected, start-up times are determined by the SUT fuses as shown in
Table 10.
Note:
1. These options should only be used if frequency stability at start-up is not important for the
application.
Table 9. 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)
4.1 ms
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
Table 10. 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)
4.1 ms
Fast rising power or BOD enabled
01
1K CK(1)
65 ms
Slowly rising power
10
32K CK
65 ms
Stable frequency at start-up
11
Reserved


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