Rainbow-electronics ATmega163L Bedienungsanleitung PDF herunterladen (Seite 140)

ATmega163(L)

140

External Clock Drive Waveforms

Figure 89. External Clock Drive Waveforms

External Clock Drive

Note: 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.

2-wire Serial Interface Characteristics

Table 64 describes the requirements for devices connected to the 2-wire Serial Bus. The ATmega163 2-wire Serial Inter-

face meets or exceeds these requirements under the noted conditions.

Timing symbols refer to Figure 90.

Table 62. External Clock Drive

Symbol Parameter

= 2.7V to 5.5VV

= 4.0V to 5.5V

UnitsMin Max Min Max

1/t

CLCL

Oscillator Frequency 0 4 0 8 MHz

CLCL

Clock Period 250 125 ns

CHCX

High Time 100 50 ns

CLCX

Low Time 100 50 ns

CLCH

Rise Time 1.6 0.5 µs

CHCL

Fall Time 1.6 0.5 µs

Table 63. External RC Oscillator, typical frequencies

R [kΩ]C [pF] f

100 70 100 kHz

31.5 20 1.0 MHz

6.5 20 4.0 MHz

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Rainbow-electronics ATmega163L Bedienungsanleitung Seite 140