PIC18F4580-ESLASHML datasheet(168/490 Pages) MICROCHIP

168 / 490 page

PIC18F2480/2580/4480/4580

DS39637D-page 168

16.1

CCP Module Configuration

Each Capture/Compare/PWM module is associated

with a control register (generically, CCPxCON) and a

data register (CCPRx). The data register, in turn, is

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

and CCPRxH (high byte). All registers are both

readable and writable.

16.1.1

CCP MODULES AND TIMER

RESOURCES

The CCP modules utilize Timers 1, 2 or 3, depending

on the mode selected. Timer1 and Timer3 are available

to modules in Capture or Compare modes, while

Timer2 is available for modules in PWM mode.

TABLE 16-1:

CCP MODE – TIMER

RESOURCE

The assignment of a particular timer to a module is

determined by the Timer to CCP enable bits in the

T3CON register (Register 15-1). Both modules may be

active at any given time and may share the same timer

resource if they are configured to operate in the same

mode (Capture/Compare or PWM) at the same time.

The interactions between the two modules are

summarized in Figure 16-1 and Figure 16-2.

TABLE 16-2:

INTERACTIONS BETWEEN CCP1 AND ECCP1 FOR TIMER RESOURCES

CCP/ECCP Mode

Timer Resource

Capture

Compare

PWM

Timer1 or Timer3

Timer2

CCP1 Mode ECCP1 Mode

Interaction

Capture

Each module can use TMR1 or TMR3 as the time base. Time base can be different for

each CCP.

Capture

Compare

CCP1 can be configured for the Special Event Trigger to reset TMR1 or TMR3

(depending upon which time base is used). Automatic A/D conversions on trigger event

can also be done. Operation of CCP1 could be affected if it is using the same timer as a

time base.

Compare

Capture

CCP1 can be configured for the Special Event Trigger to reset TMR1 or TMR3

(depending upon which time base is used). Operation of CCP1 could be affected if it is

using the same timer as a time base.

Compare

Either module can be configured for the Special Event Trigger to reset the time base.

Automatic A/D conversions on ECCP1 trigger event can be done. Conflicts may occur if

both modules are using the same time base.

Capture

PWM(1)

None

Compare

PWM(1)

None

PWM(1)

Capture

None

PWM(1)

Compare

None

PWM(1)

PWM

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

Note 1:

Includes standard and Enhanced PWM operation.

PIC18F4580-E/ML 데이터시트(PDF) 168 Page - Microchip Technology

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