PIC16F1933-ESLASHP datasheet(193/418 Pages) MICROCHIP

193 / 418 page

Preliminary

DS41364A-page 191

PIC16F193X/LF193X

19.5

PWM Mode

The PWM mode generates a Pulse-Width Modulated

signal on the CCPx pin. The duty cycle, period and

resolution are determined by the following registers:

•PRx

•TxCON

• CCPRxL

• CCPxCON

The ECCP modules have the following additional

registers:

• ECCPxAS

• PSTRxCON

•PWMxCON

In Pulse-Width Modulation (PWM) mode, the CCPx

module produces up to a 10-bit resolution PWM output

on the CCPx pin. Since the CCPx pin is multiplexed

with the PORT data latch, the TRIS for that pin must be

cleared to enable the CCPx pin output driver.

The CCPx module in PWM mode can have the PWM

based off of either Timer2, Timer4 or TImer6. This is

controlled by the CCPTMRS0 and CCPTMRS1

registers.

Reference

Section 19.2

“CCP

Clock

Selection” for more information.

Figure 19-3 shows a simplified block diagram of PWM

operation.

Figure 19-4 shows a typical waveform of the PWM

signal.

For a step-by-step procedure on how to set up the CCP

module for PWM operation, see Section 19.5.7

“Setup for PWM Operation”.

FIGURE 19-3:

SIMPLIFIED PWM BLOCK

DIAGRAM

The PWM output (Figure 19-4) has a time base

(period) and a time that the output stays high (duty

cycle).

FIGURE 19-4:

CCP PWM OUTPUT

Note:

Clearing

the

CCPxCON

will

relinquish CCPx control of the CCPx pin.

CCPRxL

CCPRxH(2) (Slave)

Comparator

TMRx

PRx

(1)

Duty Cycle Registers

CCPxCON<5:4>

Clear Timerx,

toggle CCPx pin and

latch duty cycle

Note

The 8-bit timer TMR2 register is concatenated

with the 2-bit internal system clock (FOSC), or

2 bits of the prescaler, to create the 10-bit time

base.

In PWM mode, CCPRxH is a read-only register.

TRIS

CCPx

Comparator

Period

Pulse Width

TMRX = 0

TMRx\2 = CCPRxH:CCPxCON<5:4>

TMRx = PRx

PIC16F1933-E/P Datasheet(PDF) 193 Page - Microchip Technology

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