PCI11010C datasheet(33/46 Pages) MICROCHIP

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DS00006232A-page 33

PCI11010C

3.4

Debouncers

Some pins have associated Debouncers (indicated by a DB buffer type) which can be enabled or disabled as needed.

The pins may be connected to pushbuttons that require debouncing, or they may be connected to digital outputs from

other chips which are perfectly clean (and may even be signaling something at a very high rate higher than the minimum

period resolution of the debounce timer). Via static (or even dynamic software driven) configuration, the system designer

can decide whether a Debouncer is needed and the associated timer value.

When the Debouncer is disabled, the raw input is used as the pin input. When the Debouncer is enabled, it will start to

debounce if there is a change in the value on the pin. The debounce will continue for the specified period of debounce

time. Once the debounce is complete, the signal is passed through (see Figure 3-2).

If the pin value changes within the debounce time, then the debouncing is restarted for the new input value. This behav-

ior is shown in Figure 3-3.

FIGURE 3-2:

DEBOUNCED RAW PIN INPUT

FIGURE 3-3:

DEBOUNCER RESTART

Raw Input

Signal

De-bounced

Signal

De-bounce

time

Raw Input

Signal

De-bounced

Signal

De-bounce

Period 1

(not completed)

De-bouncer

restarts

here

De-bouncer

Starts here

De-bounce

period2

(Completed)

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