ATtiny5 datasheet(118/168 Pages) ATMEL

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118

8127C–AVR–10/09

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

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

Fixed temp. within:

-40

°C – 85°C

±1%

VIL1

VIH1

Table 16-3.

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

MHz

tCLCL

Clock Period

250

125

tCHCX

High Time

100

tCLCX

Low Time

100

tCLCH

Rise Time

2.0

0.6

μs

tCHCL

Fall Time

2.0

0.6

μs

Δt

CLCL

Change in period from one clock cycle to the next

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