PIC16F1507-ESLASHSS. datasheet(179/278 Pages) MICROCHIP

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DS40001586D-page 179

PIC16(L)F1507

FIGURE 22-2:

TYPICAL CWG OPERATION WITH PWM1 (NO AUTO-SHUTDOWN)

22.5

Dead-Band Control

Dead-band control provides for non-overlapping output

signals to prevent shoot-through current in power

switches. The CWG contains two 6-bit dead-band

counters. One dead-band counter is used for the rising

edge of the input source control. The other is used for

the falling edge of the input source control.

Dead band is timed by counting CWG clock periods

from zero up to the value in the rising or falling dead-

band

counter

registers.

See

CWGxDBR

and

CWGxDBF registers (Register 22-4 and Register 22-5,

respectively).

22.6

Rising Edge Dead Band

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

CWGxA output from when the CWGxB output is turned

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

rising edge of the input source signal goes true. When

this happens, the CWGxB output is immediately turned

off and the rising edge dead-band delay time starts.

When the rising edge dead-band delay time is reached,

the CWGxA output is turned on.

The CWGxDBR register sets the duration of the dead-

band interval on the rising edge of the input source

signal. 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 for enough time

for the count to be completed, no output will be seen on

the respective output.

22.7

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 for enough time

for the count to be completed, no output will be seen on

the respective output.

Refer to Figure 22-3 and Figure 22-4 for examples.

cwg_clock

PWM1

CWGxA

CWGxB

Rising Edge

Dead Band

Rising Edge

Dead Band

Rising Edge

Dead Band

Falling Edge

Dead Band

Falling Edge

Dead Band

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