AT90PWM2 datasheet(146/361 Pages) ATMEL

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146

4317J–AVR–08/10

AT90PWM2/3/2B/3B

Figure 16-19. Burst Generation

16.8.4

PSC Input Configuration

The PSC Input Configuration is done by programming bits in configuration registers.

16.8.4.1

Filter Enable

If the “Filter Enable” bit is set, a digital filter of 4 cycles is inserted before evaluation of the signal.

The disable of this function is mainly needed for prescaled PSC clock sources, where the noise

cancellation gives too high latency.

Important: If the digital filter is active, the level sensitivity is true also with a disturbed PSC clock

to deactivate the outputs (emergency protection of external component). Likewise when used as

fault input, PSCn Input A or Input B have to go through PSC to act on PSCOUTn0/1/2/3 output.

This way needs that CLKPSC is running. So thanks to PSC Asynchronous Output Control bit

(PAOCnA/B), PSCnIN0/1 input can desactivate directly the PSC output. Notice that in this case,

input is still taken into account as usually by Input Module System as soon as CLKPSC is running.

PSC Input Filterring

16.8.4.2

Signal Polarity

One can select the active edge (edge modes) or the active level (level modes) See PELEVnx bit

description in Section “PSC n Input A Control Register – PFRCnA”, page 16716.25.14.

OFF

PSCOUTn0

PSCOUTn1

PSCn Input A

(high level)

PSCn Input A

(low level)

BURST

Digital

Filter

4 x CLK

PSC Input

Module X

Ouput

Stage

PSCOUTnX

PSCn Input A or B

CLKPSC

PSC

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