AT90PWM2 datasheet(131/361 Pages) ATMEL

131 / 361 page

131

4317J–AVR–08/10

AT90PWM2/3/2B/3B

16.3.1

PSC2 Distinctive Feature

Figure 16-2. PSC2 versus PSC1&PSC0 Block Diagram

Note:

n = 2

PSC2 has two supplementary outputs PSCOUT22 and PSCOUT23. Thanks to a first selector

PSCOUT22 can duplicate PSCOUT20 or PSCOUT21. Thanks to a second selector PSCOUT23

can duplicate PSCOUT20 or PSCOUT21.

The Output Matrix is a kind of 2*2 look up table which gives the possibility to program the output

values according to a PSC sequence (See “Output Matrix” on page 157.)

16.3.2

Output Polarity

The polarity “active high” or “active low” of the PSC outputs is programmable. All the timing dia-

grams in the following examples are given in the “active high” polarity.

OCRnRB

OCRnSB

OCRnRA

PSC Counter

Waveform

Generator B

PSC Input

Module B

PSC Input

Module A

PSCOUTn1

PCTLn

PFRCnA

PSOCn

( From Analog

Comparator n Ouput )

OCRnSA

PCNFn

PFRCnB

POM2(PSC2 only)

PICRn

Waveform

Generator A

PSCOUTn0

PSCINn

Part A

Part B

PSCOUTn2

PSCOUTn3

PISELnB

PISELnA

PSCn Input B

PSCn Input A

POS23

POS22

Output

Matrix

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