Rainbow-electronics ATmega64M1 Manuel d'utilisateur télécharger pdf (Page 312)

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8209A–AVR–08/09

ATmega16M1/32M1/64M1

29.4 Clock Characteristics

29.4.1 Calibrated Internal RC Oscillator Accuracy

29.5 External Clock Drive Characteristics

Figure 29-2. External Clock Drive Waveforms

Table 29-1. Calibration Accuracy of Internal RC Oscillator

Frequency V

Temperature Calibration Accuracy

Factory

Calibration

8.0 MHz 3V 25°C±1%

User

Calibration

7.3 - 8.1 MHz 2.7V - 5.5V -40°C to +85°C±10%

Table 1. External Clock Drive

Symbol Parameter

= 2.7 - 5.5V V

= 4.5 - 5.5V

UnitsMin. Max. Min. Max.

1/t

CLCL

Oscillator Frequency 0 8 0 16 MHz

CLCL

Clock Period 125 62.5 ns

CHCX

High Time 50 25 ns

CLCX

Low Time 50 25 ns

CLCH

Rise Time 1.6 0.5 μs

CHCL

Fall Time 1.6 0.5 μs

Δt

CLCL

Change in period from one clock cycle

to the next

22%

IL1

IH1

1 2 ... 307 308 309 310 311 312 313 314 315 316 317 ... 342 343

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Rainbow-electronics ATmega64M1 Manuel d'utilisateur Page 312

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