DSPIC33FJ12MC202 Microchip Technology Inc., DSPIC33FJ12MC202 Datasheet - Page 152
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DSPIC33FJ12MC202
Manufacturer Part Number
DSPIC33FJ12MC202
Description
High-performance, 16-bit Digital Signal Controllers
Manufacturer
Microchip Technology Inc.
Datasheet
1.DSPIC33FJ12MC202.pdf
(284 pages)
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FIGURE 14-5:
14.9.2
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:
DS70265B-page 150
DTS1A Selects PWMxL1/PWMxH1 active edge
DTS1I
DTS2A Selects PWMxL2/PWMxH2 active edge
DTS2I
DTS3A Selects PWMxL3/PWMxH3 active edge
DTS3I
Bit
Duty Cycle Generator
PWMxH
PWMxL
Time Selected by DTSxA bit (A or B)
dead time.
Selects PWMxL1/PWMxH1 inactive edge
dead time.
dead time.
Selects PWMxL2/PWMxH2 inactive edge
dead time.
dead time.
Selects PWMxL3/PWMxH3 inactive edge
dead time.
DEAD-TIME ASSIGNMENT
DEAD-TIME SELECTION BITS
DEAD-TIME TIMING DIAGRAM
Function
Preliminary
14.9.3
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 (T
T
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
• On a write to the PxDTCON1 or PxDTCON2
• On any device Reset.
CY
comparison edge event.
registers.
Note:
) can be selected for each of the dead-time values.
DEAD-TIME RANGES
The user application should not modify the
PxDTCON1 or PxDTCON2 values while
the PWM module is operating (PTEN = 1).
Unexpected results can occur.
Time Selected by DTSxI bit (A or B)
© 2007 Microchip Technology Inc.
CY
, 2 T
CY
, 4 T
CY
or 8
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