PIC18F44J10-ESLASHML datasheet(126/358 Pages) MICROCHIP

126 / 358 page

PIC18F45J10 FAMILY

DS39682C-page 124

Preliminary

13.1

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.

13.1.1

CCP MODULES AND TIMER

RESOURCES

The CCP modules utilize Timers 1 or 2, depending on

the mode selected. Timer1 is available to modules in

Capture or Compare modes, while Timer2 is available

for modules in PWM mode.

TABLE 13-1:

ECCP/CCP MODE – TIMER

RESOURCE

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

Figure 13-1

and

Figure 13-2. In Timer1 in Asynchronous Counter mode,

the capture operation will not work.

13.1.2

CCP2 PIN ASSIGNMENT

The pin assignment for CCP2 (Capture input, Compare

and PWM output) can change, based on device config-

uration. The CCP2MX configuration bit determines

which pin CCP2 is multiplexed to. By default, it is

assigned to RC1 (CCP2MX = 1). If the configuration bit

is cleared, CCP2 is multiplexed with RB3.

Changing the pin assignment of CCP2 does not auto-

matically change any requirements for configuring the

port pin. Users must always verify that the appropriate

TRIS register is configured correctly for CCP2

operation regardless of where it is located.

TABLE 13-2:

INTERACTIONS BETWEEN ECCP1/CCP1 AND CCP2 FOR TIMER RESOURCES

ECCP/CCP Mode

Timer Resource

Capture

Compare

PWM

Timer1

Timer2

CCP1 Mode CCP2 Mode

Interaction

Capture

Each module uses TMR1 as the time base.

Capture

Compare

CCP2 can be configured for the Special Event Trigger to reset TMR1. Automatic A/D

conversions on the trigger event can also be done. Operation of ECCP1/CCP1 will be

affected.

Compare

Capture

ECCP1/CCP1 can be configured for the Special Event Trigger to reset TMR1. Operation

of CCP2 will be affected.

Compare

Either module can be configured for the Special Event Trigger to reset TMR1. Automatic

A/D conversions on the CCP2 trigger event can be done.

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.

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