Rainbow-electronics ATmega64C1 Manual de usuario descargar pdf (Pagina 312)

100

101

312

7647A–AVR–02/08

ATmega32/64/M1/C1

25.3 Clock Characteristics

25.3.1 Calibrated Internal RC Oscillator Accuracy

25.4 External Clock Drive Characteristics

Figure 25-1. External Clock Drive Waveforms

25.5 Maximum Speed vs. V

Maximum frequency is depending on V

CC.

As shown in Figure 25-2 , the Maximum Frequency

equals 8MHz when V

is between 2.7V and 4.5V and equals 16MHz when V

is between 4.5V

and 5.5V.

Table 25-1. 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 - 125°C±10%

Table 2. 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 ... 365 366

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Rainbow-electronics ATmega64C1 Manual de usuario Pagina 312

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