PIC16F1459-ESSQTP datasheet(297/418 Pages) MICROCHIP

297 / 418 page

 2012 Microchip Technology Inc.

Preliminary

DS41639A-page 297

PIC16(L)F1454/5/9

25.7

Falling Edge Dead Band

The falling edge dead band delays the turn-on of the

CWGxB output from when the CWGxA output is turned

off. The falling edge dead-band time starts when the

falling edge of the input source goes true. When this

happens, the CWGxA output is immediately turned off

and the falling edge dead-band delay time starts. When

the falling edge dead-band delay time is reached, the

CWGxB output is turned on.

The CWGxDBF register sets the duration of the dead-

band interval on the falling edge of the input source sig-

nal. This duration is from 0 to 64 counts of dead band.

Dead band is always counted off the edge on the input

source signal. A count of 0 (zero), indicates that no

dead band is present.

If the input source signal is not present long enough for

the count to complete, no output will be seen on the

respective output.

Refer to Figure 25-5 and Figure 25-6 for examples.

25.8

Dead-Band Uncertainty

When the rising and falling edges of the input source

trigger the dead-band counters, the input may be asyn-

chronous. This will create some uncertainty in the dead-

band time delay. The maximum uncertainty is equal to

one CWG clock period. Refer to Equation 25-1 for more

detail.

PIC16F1459-ESSQTP Datasheet(PDF) 297 Page - Microchip Technology