Specifications

dsPIC33F/PIC24H Family Reference Manual

Example 43-17: PWM Phase Shift Initialization

The bit resolution of PWM duty cycle, phase and dead time with respect to different input clock

prescaler selections are shown in Table 43-2.

Table 43-2: Duty Cycle, Phase, Dead Time Bit Resolution Vs. Prescaler Selection

PWM Clock

Prescaler

Bit Resolution

64 ns 32 ns 16 ns 8 ns 4 ns 2 ns 1 ns

1:1 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

1:2 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

—

1:4 bit 4 bit 3 bit 2 bit 1 bit 0 — —

1:8 bit 3 bit 2 bit 1 bit 0

— — —

1:16 bit 2 bit 1 bit 0

— — — —

1:32 bit 1 bit 0

— — — — —

1:64 bit 0

— — — — — —

/* Initialize phase shift value for the PWM output */

/* Phase shifts are initialized when operating in Master Time Base */

PHASEx = 100; /* Primary phase shift value of 104 ns */

SPHASEx = 100; /* Secondary phase shift value of 104 ns */