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ATmega1284P bảng dữ liệu(PDF) 326 Page - ATMEL Corporation

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Giải thích chi tiết về linh kiện  8-bit Microcontroller with 128K Bytes In-System Programmable Flash
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ATmega1284P bảng dữ liệu(HTML) 326 Page - ATMEL Corporation

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326
8059D–AVR–11/09
ATmega1284P
26.3
Clock Characteristics
26.3.1
External Clock Drive Waveforms
Figure 26-2. External Clock Drive Waveforms
26.3.2
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 pre-
liminary values representing design targets, and will be updated after characterization of actual
silicon.
Table 26-1.
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 26-2.
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
02
08
0
16
MHz
tCLCL
Clock Period
500
125
62.5
ns
tCHCX
High Time
200
50
25
ns
tCLCX
Low Time
200
50
25
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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