Rainbow-electronics ATmega32L Instrukcja Użytkownika Pobierz pdf (Strona 286)

286

ATmega32(L)

2503C–AVR–10/02

6] The sum of all IOH, for ports C0 - C7, should not exceed 200 mA.If IOH exceeds the test condition, VOH may exceed the

related specification. Pins are not guaranteed to source current greater than the listed test condition.

5. Minimum V

for Power-down is 2.5V.

External Clock Drive

Waveforms

Figure 144. External Clock Drive Waveforms

External Clock Drive

Notes: 1. R should be in the range 3 kΩ - 100 kΩ, and C should be at least 20 pF. The C values

given in the table includes pin capacitance. This will vary with package type.

2. The frequency will vary with package type and board layout.

IL1

IH1

Table 118. External Clock Drive

Symbol Parameter

= 2.7V to 5.5VV

= 4.5V to 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

∆t

CLCL

Change in period from

one clock cycle to the

22%

Table 119. External RC Oscillator, Typical Frequencies (V

= 5V)

R [kΩ]

(1)

C [pF] f

(2)

100 47 87 kHz

33 22 650 kHz

10 22 2.0 MHz

1 2 ... 281 282 283 284 285 286 287 288 289 290 291 ... 312 313

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