DSPIC30F5015 datasheet(103/234 Pages) MICROCHIP

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DS70149E-page 103

dsPIC30F5015/5016

15.7.2

DEAD-TIME ASSIGNMENT

The DTCON2 SFR contains control bits that allow the

dead times to be assigned to each of the complemen-

tary outputs. Table 15-1 summarizes the function of

each dead-time selection control bit.

TABLE 15-1:

DEAD-TIME SELECTION BITS

15.7.3

DEAD-TIME RANGES

The amount of dead time provided by each dead-time

unit is selected by specifying the input clock prescaler

value and a 6-bit unsigned value. The amount of dead

time provided by each unit may be set independently.

Four input clock prescaler selections have been pro-

vided to allow a suitable range of dead times, based on

the device operating frequency. The clock prescaler

option may be selected independently for each of the

two dead-time values. The dead-time clock prescaler

values are selected using the DTAPS<1:0> and

DTBPS<1:0> control bits in the DTCON1 SFR. One of

four clock prescaler options (TCY, 2 TCY, 4 TCY or 8 TCY)

may be selected for each of the dead-time values.

After the prescaler values are selected, the dead time

for each unit is adjusted by loading two 6-bit unsigned

values into the DTCON1 SFR.

The dead-time unit prescalers are cleared on the

following events:

• On a load of the down timer due to a duty cycle

comparison edge event.

• On a write to the DTCON1 or DTCON2 registers.

• On any device Reset.

FIGURE 15-4:

DEAD-TIME TIMING DIAGRAM

Bit

Selects

DTS1A PWM1L/PWM1H active edge dead time.

DTS1I

PWM1L/PWM1H inactive edge dead time.

DTS2A PWM2L/PWM2H active edge dead time.

DTS2I

PWM2L/PWM2H inactive edge dead time.

DTS3A PWM3L/PWM3H active edge dead time.

DTS3I

PWM3L/PWM3H inactive edge dead time.

DTS4A PWM4L/PWM4H active edge dead time.

DTS4I

PWM4L/PWM4H inactive edge dead time.

Note:

The user should not modify the DTCON1

or DTCON2 values while the PWM mod-

ule is operating (PTEN = 1). Unexpected

results may occur.

Duty Cycle Generator

PWMxH

PWMxL

Time selected by DTSxA bit (A or B)

Time selected by DTSxI bit (A or B)

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