DSPIC33FJ12MC02ESS datasheet(152/284 Pages) MICROCHIP

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dsPIC33FJ12MC201/202

DS70265B-page 150

Preliminary

FIGURE 14-5:

DEAD-TIME TIMING DIAGRAM

14.9.2

DEAD-TIME ASSIGNMENT

The PxDTCON2 SFR contains control bits that allow

the dead times to be assigned to each of the comple-

mentary outputs. Table 14-1 summarizes the function

of each dead-time selection control bit.

TABLE 14-1:

DEAD-TIME SELECTION BITS

14.9.3

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 can 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 can 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 PxDTCON1 SFR. One

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

TCY) can 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 PxDTCON1 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 PxDTCON1 or PxDTCON2

registers.

• On any device Reset.

Duty Cycle Generator

PWMxH

PWMxL

Time Selected by DTSxA bit (A or B)

Time Selected by DTSxI bit (A or B)

Bit

Function

DTS1A Selects PWMxL1/PWMxH1 active edge

dead time.

DTS1I

Selects PWMxL1/PWMxH1 inactive edge

dead time.

DTS2A Selects PWMxL2/PWMxH2 active edge

dead time.

DTS2I

Selects PWMxL2/PWMxH2 inactive edge

dead time.

DTS3A Selects PWMxL3/PWMxH3 active edge

dead time.

DTS3I

Selects PWMxL3/PWMxH3 inactive edge

dead time.

Note:

The user application should not modify the

PxDTCON1 or PxDTCON2 values while

the PWM module is operating (PTEN = 1).

Unexpected results can occur.

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