PIC16F1934-ESLASHML datasheet(196/418 Pages) MICROCHIP

196 / 418 page

PIC16F193X/LF193X

DS41364A-page 194

Preliminary

19.5.4

OPERATION IN SLEEP MODE

In Sleep mode, the TMRx register will not increment

and the state of the module will not change. If the CCPx

pin is driving a value, it will continue to drive that value.

When the device wakes up, TMRx will continue from its

previous state.

19.5.5

CHANGES IN SYSTEM CLOCK

FREQUENCY

The PWM frequency is derived from the system clock

frequency. Any changes in the system clock frequency

will result in changes to the PWM frequency. See

Section 8.0 “Oscillator Module (With Fail-Safe

Clock Monitor)” for additional details.

19.5.6

EFFECTS OF RESET

Any Reset will force all ports to Input mode and the

CCP registers to their Reset states.

19.5.7

SETUP FOR PWM OPERATION

The following steps should be taken when configuring

the CCP module for PWM operation:

Disable the PWM pin (CCPx) output driver(s) by

setting the associated TRIS bit(s).

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 Timerx:

• Clear the TMRxIF interrupt flag bit of the PIRx

• Configure the TxCKPS bits of the TxCON

• Enable Timerx by setting the TMRxON bit of

the T2CON register.

Enable PWM output pin:

• Wait until Timerx overflows, TMRxIF bit of the

PIR1 register is set. See Note below.

• Enable the PWM pin (CCPx) output driver(s) by

clearing the associated TRIS bit(s).

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.

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