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ATtiny5 데이터시트(PDF) 118 Page - ATMEL Corporation

부품명 ATtiny5
상세설명  8-bit Microcontroller with 512/1024 Bytes In-System Programmable Flash
PDF  168 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATtiny5 데이터시트(HTML) 118 Page - ATMEL Corporation

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8127C–AVR–10/09
ATtiny4/5/9/10
16.4 Clock Characteristics
16.4.1
Accuracy of Calibrated Internal Oscillator
It is possible to manually calibrate the internal oscillator to be more accurate than default factory
calibration. Note that the oscillator frequency depends on temperature and voltage. Voltage and
temperature characteristics can be found in Figure 17-39 on page 142 and Figure 17-40 on
page 142.
Notes: 1. Accuracy of oscillator frequency at calibration point (fixed temperature and fixed voltage).
16.4.2
External Clock Drive
Figure 16-2. External Clock Drive Waveform
Table 16-2.
Calibration Accuracy of Internal RC Oscillator
Calibration
Method
Target Frequency
VCC
Temperature
Accuracy at given Voltage
& Temperature(1)
Factory
Calibration
8.0 MHz
3V
25
°C±10%
User
Calibration
Fixed frequency within:
7.3 – 8.1 MHz
Fixed voltage within:
1.8V – 5.5V
Fixed temp. within:
-40
°C – 85°C
±1%
VIL1
VIH1
Table 16-3.
External Clock Drive Characteristics
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
Clock Frequency
0
4
0
8
0
12
MHz
tCLCL
Clock Period
250
125
83
ns
tCHCX
High Time
100
50
33
ns
tCLCX
Low Time
100
50
33
ns
tCLCH
Rise Time
2.0
1
0.6
μs
tCHCL
Fall Time
2.0
1
0.6
μs
Δt
CLCL
Change in period from one clock cycle to the next
2
2
2
%



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