AT90PWM2 datasheet(142/361 Pages) ATMEL

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142

4317J–AVR–08/10

AT90PWM2/3/2B/3B

16.7.2

Modes of Operation

16.7.2.1

Normal Mode

The simplest mode of operation is the normal mode. See Figure 16-6.

The active time of PSCOUTn0 is given by the OT0 value. The active time of PSCOUTn1 is given

by the OT1 value. Both of them are 12 bit values. Thanks to DT0 & DT1 to ajust the dead time

between PSCOUTn0 and PSCOUTn1 active signals.

The waveform frequency is defined by the following equation:

16.7.2.2

Enhanced Mode

The Enhanced Mode uses the previously described method to generate a high resolution

frequency.

Figure 16-13. Enhanced Mode, Timing Diagram

The supplementary step in counting to generate fb2 is added on the PSCn0 signal while needed

in the frame according to the fractional divider. SeeTable 16-5, “Distribution of fb2 in the modu-

lated frame,” on page 141

The waveform frequency is defined by the following equations:

d is the fractionel divider factor.

fPSCn

PSCnCycle

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

CLK_PSCn

OT0 OT1 DT0 DT1

()

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

PSCOUTn0

Period

PSCOUTn1

OT0

OT1

DT1

DT0

OT0

OT1+1

DT1

DT0

f1PSCn

------

CLK_PSCn

OT0 OT1 DT0 DT1

()

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

f2PSCn

------

CLK_PSCn

OT0 OT1 DT0 DT11

()

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

fAVERAGE

------

f1PSCn

–

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

f2PSCn

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