PIC876 datasheet(59/218 Pages) MICROCHIP

59 / 218 page

 2001 Microchip Technology Inc.

DS30292C-page 57

PIC16F87X

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.

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 reset Timer1.

CCP2 Module:

Capture/Compare/PWM Register2 (CCPR2) is com-

prised of two 8-bit registers: CCPR2L (low byte) and

CCPR2H (high byte). The CCP2CON register controls

the operation of CCP2. The special event trigger is

generated by a compare match and will reset Timer1

and start an A/D conversion (if the A/D module is

enabled).

Additional information on CCP modules is available in

the PICmicro™ 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

Compare

PWM

Timer1

Timer2

CCPx Mode CCPy Mode

Interaction

Capture

Same TMR1 time-base

Capture

Compare

The compare should be configured for the special event trigger, which clears TMR1

Compare

The compare(s) should be configured for the special event trigger, which clears TMR1

PWM

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

PWM

Capture

None

PWM

Compare

None

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