Rainbow-electronics ATtiny861_V Manual de usuario descargar pdf (Pagina 188)

188

2588B–AVR–11/06

ATtiny261/461/861

23.4 Clock Characteristics

23.4.1 Calibrated Internal RC Oscillator Accuracy

Notes: 1. Voltage range for ATtiny261V/461V/861V.

2. Voltage range for ATtiny261/461/861.

23.4.2 External Clock Drive Waveforms

Figure 23-3. External Clock Drive Waveforms

23.4.3 External Clock Drive

Table 23-1. Calibration Accuracy of Internal RC Oscillator

Frequency V

Temperature Calibration Accuracy

Factory

Calibration

8.0 MHz 3V 25°C ±10%

User

Calibration

7.3 - 8.1 MHz

1.8V - 5.5V

(1)

2.7V - 5.5V

(2)

-40°C - 85°C±1%

IL1

IH1

Table 23-2. External Clock Drive

Symbol Parameter

= 1.8 - 5.5V V

= 2.7 - 5.5V V

= 4.5 - 5.5V

UnitsMin. Max. Min. Max. Min. Max.

1/t

CLCL

Clock Frequency 0 4 0 10 0 20 MHz

CLCL

Clock Period 250 100 50 ns

CHCX

High Time 100 40 20 ns

CLCX

Low Time 100 40 20 ns

CLCH

Rise Time 2.0 1.6 0.5 μs

CHCL

Fall Time 2.0 1.6 0.5 μs

Δt

CLCL

Change in period from one clock cycle to the next 2 2 2 %

1 2 ... 183 184 185 186 187 188 189 190 191 192 193 ... 235 236

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Rainbow-electronics ATtiny861_V Manual de usuario Pagina 188

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