PIC16 datasheet(268/418 Pages) MICROCHIP

268 / 418 page

PIC16(L)F1508/9

DS40001609C-page 268

 2011-2013 Microchip Technology Inc.

23.1.9

SETUP FOR PWM OPERATION

USING PWMx PINS

The following steps should be taken when configuring

the module for PWM operation using the PWMx pins:

Disable the PWMx pin output driver(s) by setting

the associated TRIS bit(s).

Clear the PWMxCON register.

Load the PR2 register with the PWM period

value.

Clear the PWMxDCH register and bits <7:6> of

the PWMxDCL register.

Configure and start Timer2:

• Clear the TMR2IF interrupt flag bit of the

PIR1 register. See note below.

• Configure the T2CKPS bits of the T2CON

• Enable Timer2 by setting the TMR2ON bit of

the T2CON register.

Enable PWM output pin and wait until Timer2

overflows, TMR2IF bit of the PIR1 register is set.

See note below.

Enable the PWMx pin output driver(s) by clear-

ing the associated TRIS bit(s) and setting the

PWMxOE bit of the PWMxCON register.

Configure the PWM module by loading the

PWMxCON register with the appropriate values.

Note 1: In order to send a complete duty cycle

and period on the first PWM output, the

above steps must be followed in the order

given. If it is not critical to start with a

complete PWM signal, then move Step 8

to replace Step 4.

2: For operation with other peripherals only,

disable PWMx pin outputs.

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