AT90PWM2 datasheet(144/365 Pages) ATMEL

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4317K–AVR–03/2013

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 adjust 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. See Table 16-5, “Distribution of fb2 in the modu-

lated frame,” on page 143

The waveform frequency is defined by the following equations:

d is the fractional divider factor.

PSCn

PSCnCycle

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

CLK_PSCn

OT0

OT1

DT0

DT1

+++



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

PSCOUTn0

Period

PSCOUTn1

OT0

OT1

DT1

DT0

OT0

OT1+1

DT1

DT0

PSCn

------

fCLK_PSCn

OT0

OT1

DT0

DT1



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

PSCn

------

CLK_PSCn

OT0

OT1

DT0

DT11



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

AVERAGE

–

---------------f1

PSCn

------f2

PSCn

AT90PWM2 Datasheet(PDF) 144 Page - ATMEL Corporation

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