Rainbow-electronics ATtiny43U Bedienungsanleitung Seite 157

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8048B–AVR–03/09
20.4 Clock Characteristics
20.4.1 Calibrated Internal Oscillator Accuracy
It is possible to manually calibrate the internal oscillator to be more accurate than default factory calibration. Please note
that the oscillator frequency depends on temperature and voltage.
Notes: 1. Accuracy of oscillator frequency at calibration point (fixed temperature and fixed voltage).
20.4.2 External Clock Drive
Figure 20-2. External Clock Drive Waveforms
Table 20-2. Calibration Accuracy of Internal Oscillator
Calibration
Method Target Frequency V
CC
Temperature
Accuracy at given Voltage
& Temperature
(1)
Factory
Calibration
8.0 MHz 3V 25°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%
Table 20-3. External Clock Drive Characteristics
Symbol Parameter
V
CC
= 1.8 - 5.5V V
CC
= 2.7 - 5.5V
UnitsMin. Max. Min. Max.
1/t
CLCL
Clock Frequency 0408MHz
t
CLCL
Clock Period 250 125 ns
t
CHCX
High Time 100 50 ns
t
CLCX
Low Time 100 50 ns
t
CLCH
Rise Time 2.0 1.6 μs
t
CHCL
Fall Time 2.0 1.6 μs
Δt
CLCL
Period change from clock cycle to next 2 2 %
V
IL1
V
IH1
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