PIC16F1526 datasheet(193/354 Pages) MICROCHIP

193 / 354 page

 2011 Microchip Technology Inc.

Preliminary

DS41458A-page 193

PIC16(L)F1526/27

20.3.2

SETUP FOR PWM OPERATION

The following steps should be taken when configuring

the CCP module for standard PWM operation:

Disable the CCPx pin output driver by setting the

associated TRIS bit.

Load the PRx register with the PWM period

value.

Configure the CCP module for the PWM mode

by loading the CCPxCON register with the

appropriate values.

Load the CCPRxL register and the DCxBx bits

of the CCPxCON register, with the PWM duty

cycle value.

Configure and start Timer2/4/6/8/10:

• Select the Timer2/4/6/8/10 resource to be

used for PWM generation by setting the

CxTSEL<1:0> bits in the CCPTMRSx

• Clear the TMRxIF interrupt flag bit of the

PIRx register. See Note below.

• Configure the TxCKPS bits of the TxCON

• Enable the Timer by setting the TMRxON

bit of the TxCON register.

Enable PWM output pin:

• Wait until the Timer overflows and the

TMRxIF bit of the PIRx register is set. See

Note below.

• Enable the CCPx pin output driver by clear-

ing the associated TRIS bit.

20.3.3

TIMER2/4/6/8/10 TIMER RESOURCE

The PWM standard mode makes use of one of the 8-bit

Timer2/4/6/8/10 timer resources to specify the PWM

period.

Configuring the CxTSEL<1:0> bits in the CCPTMRSx

See Table 20-6 for CCPx PWM Timer2/4/6/8/10

resources.

20.3.4

PWM PERIOD

The PWM period is specified by the PRx register of

Timer2/4/6/8/10. The PWM period can be calculated

using the formula of Equation 20-1.

EQUATION 20-1:

PWM PERIOD

When TMRx is equal to PRx, the following three events

occur on the next increment cycle:

• TMRx is cleared

• The CCPx pin is set. (Exception: If the PWM duty

cycle = 0%, the pin will not be set.)

• The PWM duty cycle is latched from CCPRxL into

CCPRxH.

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.

Note:

The Timer postscaler (see Section 19.1

“Timer2/4/6/8/10 Operation”

is not used

in the

determination of

the PWM

frequency.

PWM Period

PRx

 1

 4TOSC 



(TMRx Prescale Value)

Note 1:

TOSC = 1/FOSC

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