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ATMEGA8-16PU 데이터시트(PDF) 28 Page - ATMEL Corporation

부품명 ATMEGA8-16PU
상세설명  8-bit with 8K Bytes In-System Programmable Flash
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

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28
2486T–AVR–05/08
ATmega8(L)
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 11. 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 6.
Note:
1. These options should only be used if frequency stability at start-up is not important for the
application.
External RC
Oscillator
For timing insensitive applications, the external RC configuration shown in Figure 12 can be
used. The frequency is roughly estimated by the equation f = 1/(3RC). C should be at least 22
Table 5. 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
(VCC = 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
101
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 6. 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


유사한 부품 번호 - ATMEGA8-16PU

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