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ATtiny261A bảng dữ liệu(PDF) 186 Page - ATMEL Corporation

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ATtiny261A bảng dữ liệu(HTML) 186 Page - ATMEL Corporation

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186
8197A–AVR–10/09
ATtiny261A/461A/861A
19.4 Clock Characteristics
19.4.1
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 20-49 on page 219 and Figure 20-50 on
page 219.
Notes: 1. Accuracy of oscillator frequency at calibration point (fixed temperature and fixed voltage).
19.4.2
External Clock Drive
Figure 19-2. External Clock Drive Waveforms
Table 19-2.
Calibration Accuracy of Internal 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 temperature
within:
-40
°C - 85°C
±1%
VIL1
VIH1
Table 19-3.
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
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
2
2
2
%



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