PIC16F7X7 datasheet(89/276 Pages) MICROCHIP

89 / 276 page

 2004 Microchip Technology Inc.

DS30498C-page 87

PIC16F7X7

9.0

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

The CCP1, CCP2 and CCP3 modules are identical in

operation, with the exception being the operation of the

special event trigger. Table 9-1 and Table 9-2 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 and CCP3

operate the same as CCP1, except where noted.

9.1

CCP1 Module

Capture/Compare/PWM

(CCPR1)

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

and CCPR1H (high byte). The CCP1CON register con-

trols the operation of CCP1. The special event trigger

is generated by a compare match and will clear both

TMR1H and TMR1L registers.

9.2

CCP2 Module

Capture/Compare/PWM Register 2 (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 gen-

erated by a compare match; it will clear both TMR1H and

TMR1L registers 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 Module(s)” (DS00594).

9.3

CCP3 Module

Capture/Compare/PWM Register 3 (CCPR3) is com-

prised of two 8-bit registers: CCPR3L (low byte) and

CCPR3H (high byte). The CCP3CON register controls

the operation of CCP3.

TABLE 9-1:

CCP MODE – TIMER

RESOURCES REQUIRED

TABLE 9-2:

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

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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