AT90PWM2B-16SU 查看數據表（PDF） - Atmel Corporation

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AT90PWM2B-16SU

8-bit Atmel Microcontroller with 8K Bytes In-System Programmable Flash

Atmel Corporation 

AT90PWM2/3/2B/3B

16.8 PSC Inputs

Each part A or B of PSC has its own system to take into account one PSC input. According to

PSC n Input A/B Control Register (see description in “PSC n Input A Control Register –

PFRCnA” on page 169page 169), PSCnIN0/1 input can act has a Retrigger or Fault input.

This system A or B is also configured by this PSC n Input A/B Control Register (PFRCnA/B).

Figure 16-14. PSC Input Module

PAOCnA

(PAOCnB)

PSCINn

Analog

Comparator

n Output

0

1

PISELnA

(PISELnB)

Digital

Filter

CLK PSC

PELEVnA / PCAEnA

(PELEVnB) (PCAEnB)

PRFMnA3:0

(PRFMnB3:0)

0

1

PFLTEnA

(PFLTEnB)

2

4

CLK PSC

Input

Processing

(retriggering ...)

CLK PSC

PSC Core

(Counter,

Waveform

Generator, ...)

Output

Control

PSCOUTn0

(PSCOUTn1)

(PSCOUT22)

(PSCOUT23)

16.8.1

16.8.2

PSC Retrigger Behaviour versus PSC running modes

In centered mode, Retrigger Inputs have no effect.

In two ramp or four ramp mode, Retrigger Inputs A or B cause the end of the corresponding

cycle A or B and the beginning of the following cycle B or A.

In one ramp mode, Retrigger Inputs A or B reset the current PSC counting to zero.

Retrigger PSCOUTn0 On External Event

PSCOUTn0 ouput can be resetted before end of On-Time 0 on the change on PSCn Input A.

PSCn Input A can be configured to do not act or to act on level or edge modes. The polarity of

PSCn Input A is configurable thanks to a sense control block. PSCn Input A can be the Output of

the analog comparator or the PSCINn input.

As the period of the cycle decreases, the instantaneous frequency of the two outputs increases.

4317K–AVR–03/2013

145

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