ATtiny13A datasheet(119/174 Pages) ATMEL

119 / 174 page

119

8126D–AVR–11/09

ATtiny13A

18.4 Clock Characteristics

18.4.1

Calibrated Internal RC Oscillator Accuracy

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 19-46 on page 147, Figure 19-47 on page

148, Figure 19-48 on page 148, Figure 19-49 on page 149, Figure 19-50 on page 149, and Fig-

ure 19-51 on page 150.

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

18.4.2

External Clock Drive

Figure 18-2. External Clock Drive Waveform

Table 18-2.

Calibration Accuracy of Internal RC Oscillator

Calibration

Method

Target Frequency

VCC

Temperature

Accuracy at given Voltage

& Temperature(1)

Factory

Calibration

4.8 / 9.6 MHz

⋅C±10%

User

Calibration

Fixed frequency within:

4 – 5 MHz / 8 – 10 MHz

Fixed voltage within:

1.8V – 5.5V

Fixed temperature

within:

-40

⋅C – 85⋅C

±2%

VIL1

VIH1

Table 18-3.

External Clock Drive

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

100

tCHCX

High Time

100

tCLCX

Low Time

100

tCLCH

Rise Time

2.0

1.6

0.5

µs

tCHCL

Fall Time

2.0

1.6

0.5

µs

Δt

CLCL

Change in period from one clock cycle to the next

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