Datasheet

102
7734Q–AVR–02/12
AT90PWM81/161
12.3.1 PSC2 Distinctive Feature
Figure 12-2. 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 out-
put values according to a PSC sequence (see “Output Matrix” on page 129).
12.3.2 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.
DATABUS
OCRnRB
OCRnSB
OCRnRA
=
=
=
PSC Counter
Waveform
Generator B
PSC Input
Module B
PSC Input
Module A
PSCOUTn1
PCTLn PFRCnA PSOCn
OCRnSA
=
PCNFn PFRCnB POM2(PSC2 only)
PICRn
Waveform
Generator A
PSCOUTn0
Part A
Part B
PSCOUTn2
PSCOUTn3
PSCn Input B
PSCn Input A
POS23
POS22
Output
Matrix
PCNFEn PASDLYn