Rainbow-electronics ATmega64L Bedienungsanleitung PDF herunterladen (Seite 284)

284

ATmega16(L)

2466B–09/01

8] The sum of all IOH, for ports D4-D7, should not exceed 100 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 145. External Clock Drive Waveforms

External Clock Drive

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

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

IL1

IH1

Table 119. 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 TBD 0 TBD MHz

CLCL

Clock Period TBD TBD ns

CHCX

High Time TBD TBD ns

CLCX

Low Time TBD TBD ns

CLCH

Rise Time TBD TBD µs

CHCL

Fall Time TBD TBD µs

Table 120. External RC Oscillator, Typical Frequencies

R [kΩ]

(1)

C [pF] f

100 70 TBD

31.5 20 TBD

6.5 20 TBD

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Rainbow-electronics ATmega64L Bedienungsanleitung Seite 284