PIC16CR74ESLASHSP datasheet(55/172 Pages) MICROCHIP

55 / 172 page

DS21993C-page 53

PIC16CR7X

8.0

CAPTURE/COMPARE/PWM

MODULES

Each Capture/Compare/PWM (CCP) module contains

a 16-bit register which can operate as a:

• 16-bit Capture register

• 16-bit Compare register

• PWM Master/Slave Duty Cycle register

Both the CCP1 and CCP2 modules are identical in

operation, with the exception being the operation of the

special event trigger. Table 8-1 and Table 8-2 show the

resources and interactions of the CCP module(s). In

the following sections, the operation of a CCP module

is described with respect to CCP1. CCP2 operates the

same as CCP1, except where noted.

8.1

CCP1 Module

Capture/Compare/PWM Register1 (CCPR1) is com-

prised of two 8-bit registers: CCPR1L (low byte) and

CCPR1H (high byte). The CCP1CON register controls

the operation of CCP1. The special event trigger is

generated by a compare match and will clear both

TMR1H and TMR1L registers.

8.2

CCP2 Module

Capture/Compare/PWM Register1 (CCPR1) is com-

prised of two 8-bit registers: CCPR1L (low byte) and

CCPR1H (high byte). The CCP2CON register controls

the operation of CCP2. The special event trigger is

generated by a compare match; it will clear both

TMR1H and TMR1L registers, and start an A/D conver-

sion (if the A/D module is enabled).

Additional information on CCP modules is available in

the “PIC® Mid-Range MCU Family Reference Manual”

(DS33023) and in Application Note AN594, “Using the

CCP Modules” (DS00594).

TABLE 8-1:

CCP MODE – TIMER

RESOURCES REQUIRED

TABLE 8-2:

INTERACTION OF TWO CCP MODULES

CCP Mode

Timer Resource

Capture

Timer1

Compare

Timer1

PWM

Timer2

CCPx Mode CCPy Mode

Interaction

Capture

Same TMR1 time base.

Capture

Compare

Same TMR1 time base.

Compare

Same TMR1 time base.

PWM

The PWMs will have the same frequency and update rate (TMR2 interrupt).

The rising edges are aligned.

PWM

Capture

None.

PWM

Compare

None.

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