PIC18F4685-ISLASHSP datasheet(166/484 Pages) MICROCHIP

166 / 484 page

PIC18F2682/2685/4682/4685

DS39761B-page 164

Preliminary

15.1

CCP1 Module Configuration

Each Capture/Compare/PWM module is associated

with a control register (CCP1CON or ECCP1CON) and

a data register (CCPR1 or ECCPR1). The data register,

in turn, is comprised of two 8-bit registers: CCPR1L or

ECCPR1L (low byte) and CCPR1H or ECCPR1H (high

byte). All registers are both readable and writable.

15.1.1

CCP1 MODULES AND TIMER

RESOURCES

The CCP1 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 15-1:

CCP1 MODE – TIMER

RESOURCE

The assignment of a particular timer to a module is

determined by the Timer to CCP1/ECCP1 enable bits

in the T3CON register (Register 14-1). 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 15-1 and Figure 15-2.

TABLE 15-2:

INTERACTIONS BETWEEN CCP1 AND ECCP1 FOR TIMER RESOURCES

CCP1/ECCP1 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 CCP1.

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*

None

Compare

PWM*

None

PWM*

Capture

None

PWM*

Compare

None

PWM*

PWM

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

Includes standard and Enhanced PWM operation.

PIC18F4685-I/SP Datasheet(PDF) 166 Page - Microchip Technology

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