ATtiny44 datasheet(176/236 Pages) ATMEL

tên linh kiện	ATtiny44

Giải thích chi tiết về linh kiện	8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash

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176

8006H–AVR–10/09

ATtiny24/44/84

Figure 20-2. Maximum Frequency vs. V

CC (ATtiny24/44/84)

20.4

Clock Characteristics

20.4.1

Accuracy of Calibrated Internal RC 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 21-40 on page 206 and Figure 21-41 on

page 206.

Notes:

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

2. Voltage range for ATtiny24V/44V/84V.

3. Voltage range for ATtiny24/44/84.

20 MHz

10 MHz

2.7V

4.5V

5.5V

Safe Operating Area

Table 20-2.

Calibration Accuracy of Internal RC Oscillator

Calibration

Method

Target Frequency

VCC

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(2)

2.7V – 5.5V(3)

Fixed temperature

within:

-40

°C – 85°C

±1%

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