Rainbow-electronics ATtiny28L Bedienungsanleitung PDF herunterladen (Seite 54)

ATtiny28L/V

1062E–10/01

External Clock Drive Waveforms

Figure 40. External Clock

Note: R should be in the range 3 - 100 kΩ, and C should be at least 20 pF.

VIL1

VIH1

External Clock Drive

Symbol Parameter

= 1.8V to 2.7V V

= 2.7V to 4.0V V

= 4.0V to 5.5V

UnitsMin Max Min Max Min Max

1/t

CLCL

Oscillator Frequency 0.0 1.2 0.0 4.0 0.0 4.0 MHz

CLCL

Clock Period 833.0 250.0 250.0 ns

CHCX

High Time 333.0 100.0 100.0 ns

CLCX

Low Time 333.0 100.0 100.0 ns

CLCH

Rise Time 1.6 1.6 0.5 µs

CHCL

Fall Time 1.6 1.6 0.5 µs

Table 25. External RC Oscillator, Typical Frequencies

R [kΩ] C [pF] f

100.0 70.0 100.0 kHz

31.5 20.0 1.0 MHz

6.5 20.0 4.0 MHz

1 2 ... 49 50 51 52 53 54 55 56 57 58 59 ... 74 75

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Rainbow-electronics ATtiny28L Bedienungsanleitung Seite 54