Rainbow-electronics ATtiny10 Manuel d'utilisateur télécharger pdf (Page 118)

118

8127B–AVR–08/09

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 V

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%

IL1

IH1

Table 16-3. External Clock Drive Characteristics

Symbol Parameter

= 1.8 - 5.5V V

= 2.7 - 5.5V V

= 4.5 - 5.5V

UnitsMin. Max. Min. Max. Min. Max.

1/t

CLCL

Clock Frequency 0 4 0 10 0 20 MHz

CLCL

Clock Period 250 100 50 ns

CHCX

High Time 100 40 20 ns

CLCX

Low Time 100 40 20 ns

CLCH

Rise Time 2.0 1.6 0.5 μs

CHCL

Fall Time 2.0 1.6 0.5 μs

Δt

CLCL

Change in period from one clock cycle to the next 2 2 2 %

1 2 ... 113 114 115 116 117 118 119 120 121 122 123 ... 165 166

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