DSPIC30F4012 datasheet(101/238 Pages) MICROCHIP

101 / 238 page

DS70135G-page 101

dsPIC30F4011/4012

15.3

Edge-Aligned PWM

Edge-aligned PWM signals are produced by the module

when the PWM time base is in the Free-Running or

Single-Shot mode. For edge-aligned PWM outputs, the

output has a period specified by the value in PTPER

and a duty cycle specified by the appropriate duty cycle

active at the beginning of the period (PTMR = 0) and is

driven inactive when the value in the duty cycle register

matches PTMR.

If the value in a particular duty cycle register is zero,

then the output on the corresponding PWM pin will be

inactive for the entire PWM period. In addition, the out-

put on the PWM pin will be active for the entire PWM

period if the value in the duty cycle register is greater

than the value held in the PTPER register.

FIGURE 15-2:

EDGE-ALIGNED PWM

15.4

Center-Aligned PWM

Center-aligned PWM signals are produced by the

module when the PWM time base is configured in a

Continuous Up/Down Count mode (see Figure 15-3).

The PWM compare output is driven to the active state

when the value of the duty cycle register matches the

value of PTMR and the PWM time base is counting

downwards (PTDIR = 1). The PWM compare output is

driven to the inactive state when the PWM time base is

counting upwards (PTDIR = 0) and the value in the

PTMR register matches the duty cycle value.

If the value in a particular duty cycle register is zero,

then the output on the corresponding PWM pin will be

inactive for the entire PWM period. In addition, the out-

put on the PWM pin will be active for the entire PWM

period if the value in the duty cycle register is equal to

the value held in the PTPER register.

FIGURE 15-3:

CENTER-ALIGNED PWM

Period

Duty Cycle

PTPER

PTMR

Value

New Duty Cycle Latched

PTPER

PTMR

Value

Period

Period/2

Duty

Cycle

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