23.10 Setup for PWM Operation to Other Device Peripherals
The following steps should be taken when configuring the module for PWM operation to be used by other device peripherals:
- Disable the PWMx pin output driver(s) by setting the associated TRIS bit(s).
- Clear the PWMxCON register.
- Load the T2PR register with the PWM period value.
- Load the PWMxDCH register and bits <7:6> of the PWMxDCL register with the PWM duty cycle value.
- Configure and start Timer2:
- Clear the TMR2IF interrupt flag bit of the PIRx register.(1)
- Select the timer clock source to be as FOSC/4 using the TxCLKCON register. This is required for correct operation of the PWM module.
- Configure the T2CKPS bits of the T2CON register with the Timer2 prescale value.
- Enable Timer2 by setting the T2ON bit of the T2CON register.
- Wait until Timer2 overflows, TMR2IF bit of the PIRx register is set.(1)
- Configure the PWM module by loading the PWMxCON register with the appropriate values.
Note:
- In order to send a complete duty cycle and period on the first PWM output, the above steps must be included in the setup sequence. If it is not critical to start with a complete PWM signal on the first output, then step 6 may be ignored.