AT90PWM2 datasheet(311/365 Pages) ATMEL

tên linh kiện	AT90PWM2

Giải thích chi tiết về linh kiện	8-bit Microcontroller with 8K Bytes In-System Programmable Flash

PDF	365 Pages

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311 / 365 page

311

AT90PWM2/3

4317B–AVR–02/05

External Clock Drive Characteristics

Figure 147. External Clock Drive Waveforms

Maximum Speed vs. V

Maximum frequency is depending on V

CC. As shown in Figure 148 , the Maximum Fre-

quency vs. V

CC curve is linear between x.xV < VCC < 4.5V. To calculate the maximum

frequency at a given voltage in this interval, use this equation:

At 3 Volt, this gives:

Thus, when V

CC = 3V, maximum frequency will be 14 MHz.

To calculate required voltage for a maximum frequency, use this equation::

Table 133. External Clock Drive

Symbol

Parameter

VCC = 2.7 - 5.5V

VCC = 4.5 - 5.5V

Units

Min.

Max.

Min.

Max.

1/tCLCL

Oscillator Frequency

TBD

MHz

tCLCL

Clock Period

TBD

tCHCX

High Time

TBD

tCLCX

Low Time

TBD

tCLCH

Rise Time

TBD

µs

tCHCL

Fall Time

TBD

µs

∆t

CLCL

Change in period from one clock

cycle to the next

VIL1

VIH1

Frequency

0,9

–

()

0,15

----------------------

Frequency

30,9

–

()

0,15

----------------------

Voltage

0,9

0,15

•

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