PIC18F258-ESLASHLSQTP datasheet(126/402 Pages) MICROCHIP

126 / 402 page

PIC18FXX8

DS41159E-page 124

15.1

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. All are readable and writable.

Table 15-1 shows the timer resources of the CCP

module modes.

TABLE 15-1:

CCP1 MODE – TIMER

RESOURCE

15.2

Capture Mode

In Capture mode, CCPR1H:CCPR1L captures the 16-

bit value of the TMR1 or TMR3 register when an event

occurs on pin RC2/CCP1. An event is defined as:

• every falling edge

• every rising edge

• every 4th rising edge

• every 16th rising edge

An event is selected by control bits CCP1M3:CCP1M0

(CCP1CON<3:0>). When a capture is made, the

interrupt request flag bit, CCP1IF (PIR registers), is set.

It must be cleared in software. If another capture

occurs before the value in register CCPR1 is read, the

old captured value will be lost.

15.2.1

CCP PIN CONFIGURATION

In Capture mode, the RC2/CCP1 pin should be

configured as an input by setting the TRISC<2> bit.

15.2.2

TIMER1/TIMER3 MODE SELECTION

The timers used with the capture feature (either Timer1

and/or Timer3) must be running in Timer mode or Syn-

chronized Counter mode. In Asynchronous Counter

mode, the capture operation may not work. The timer

used with each CCP module is selected in the T3CON

TABLE 15-2:

INTERACTION OF CCP1 AND ECCP1 MODULES

CCP1 Mode

Timer Resource

Capture

Compare

PWM

Timer1 or Timer3

Timer2

Note:

If the RC2/CCP1 is configured as an out-

put, a write to the port can cause a capture

condition.

CCP1

Mode

ECCP1

Mode

Interaction

Capture

TMR1 or TMR3 time base. Time base can be different for each CCP.

Capture

Compare

The compare could be configured for the special event trigger which clears either TMR1

or TMR3, depending upon which time base is used.

Compare

The compare(s) could be configured for the special event trigger which clears TMR1 or

TMR3, depending upon which time base is used.

PWM

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

PWM

Capture

None.

PWM

Compare

None.

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