ATtiny48 datasheet(203/266 Pages) ATMEL

203 / 266 page

203

8008C–AVR–03/09

ATtiny48/88

21.3

Speed Grades

Maximum frequency is dependent on V

CC. As shown in Figure 21-1, the Maximum Frequency vs.

CC curve is linear between 1.8V < VCC < 4.5V.

Figure 21-1. Maximum Frequency vs. V

21.4

Clock Characterizations

21.4.1

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. Volt-

age and temperature characteristics can be found in TBD.

Notes:

1. Accuracy of oscillator frequency at calibration point (fixed temperature and fixed voltage).

21.4.2

External Clock Drive

Figure 21-2. External Clock Drive Waveforms

4 MHz

1.8V

5.5V

4.5V

12 MHz

Table 21-1.

Calibration Accuracy of Internal Oscillator

Calibration

Method

Target Frequency

Temperature

Accuracy at given

Voltage & Temperature(1)

Factory Calibration

8.0 MHz

°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

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