PWM Period

The PWM period is specified by the TxPR register. The PWM period can be calculated using the formula of Figure 1. It is required to have F_OSC/4 as the selected clock input to the timer for correct PWM operation.

Figure 1. PWM Period

PWM Period=[(T2PR)+1]•4•Tosc•(TMR2 Prescale⁢ Value)

Note: T_OSC = 1/F_OSC

When TxTMR is equal to TxPR, the following three events occur on the next increment cycle:

TxTMR is cleared
The PWM output is active (Exception: When the PWM duty cycle = 0%, the PWM output will remain inactive)
The PWMxDCH and PWMxDCL register values are latched into the buffers

Important: The Timer2 postscaler has no effect on the PWM operation.