DSPIC30F4012 Microchip Technology Inc., DSPIC30F4012 Datasheet - Page 99

• Manufacturer Part Number: DSPIC30F4012
• Description: Dspic30f4011/4012 Enhanced Flash 16-bit Digital Signal Controller
• Manufacturer: Microchip Technology Inc.

15.7.1
Each complementary output pair for the PWM module
has a 6-bit down counter that is used to produce the
dead-time insertion. As shown in Figure 15-4, each
dead-time unit has a rising and falling edge detector
connected to the duty cycle comparison output.
15.7.2
The amount of dead time provided by the dead-time
unit is selected by specifying the input clock prescaler
value and a 6-bit unsigned value.
Four input clock prescaler selections have been
provided to allow a suitable range of dead time based
on the device operating frequency. The dead-time
clock prescaler values are selected using the
FIGURE 15-4:
© 2007 Microchip Technology Inc.
PWMxH
Duty Cycle Generator
PWMxL
DEAD-TIME GENERATORS
DEAD-TIME RANGES
DEAD-TIME TIMING DIAGRAM
Dead-Time A (Active)
DTAPS<1:0> control bits in the DTCON1 SFR. One of
four clock prescaler options (T
may be selected.
After the prescaler value is selected, the dead time is
adjusted by loading 6-bit unsigned values into the
DTCON1 SFR.
The dead-time unit prescaler is cleared on the following
events:
• On a load of the down timer due to a duty cycle
• On a write to the DTCON1 register.
• On any device Reset.
comparison edge event.
Note:
dsPIC30F4011/4012
The user should not modify the DTCON1
value while the PWM module is operating
(PTEN = 1). Unexpected results may
occur.
Dead-Time A (Inactive)
CY
, 2 T
CY
DS70135E-page 97
, 4 T
CY
or 8 T
CY
)