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ATmega328P 데이터시트(PDF) 317 Page - ATMEL Corporation

부품명 ATmega328P
상세설명  8-bit Microcontroller with 4/8/16/32K Bytes In-System Programmable Flash
PDF  448 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
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317
8161D–AVR–10/09
ATmega48PA/88PA/168PA/328P
28.4
Clock Characteristics
28.4.1
Calibrated Internal RC Oscillator Accuracy
28.4.2
External Clock Drive Waveforms
Figure 28-2. External Clock Drive Waveforms
28.4.3
External Clock Drive
Note:
All DC Characteristics contained in this datasheet are based on simulation and characterization of other AVR microcontrollers
manufactured in the same process technology. These values are preliminary values representing design targets, and will be
updated after characterization of actual silicon.
Table 28-1.
Calibration Accuracy of Internal RC Oscillator
Frequency
V
CC
Temperature
Calibration Accuracy
Factory
Calibration
8.0 MHz
3V
25
°C±10%
User
Calibration
7.3 - 8.1 MHz
1.8V - 5.5V
-40
°C - 85°C±1%
VIL1
VIH1
Table 28-2.
External Clock Drive
Symbol
Parameter
VCC= 1.8 - 5.5V
VCC= 2.7 - 5.5V
VCC= 4.5 - 5.5V
Units
Min.
Max.
Min.
Max.
Min.
Max.
1/tCLCL
Oscillator Frequency
0
4
0
10
0
20
MHz
tCLCL
Clock Period
250
100
50
ns
tCHCX
High Time
100
40
20
ns
tCLCX
Low Time
100
40
20
ns
tCLCH
Rise Time
2.0
1.6
0.5
μs
tCHCL
Fall Time
2.0
1.6
0.5
μs
Δt
CLCL
Change in period from
one clock cycle to the
next
22
2
%



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