PIC18C658T-I/L【PDF 33/246 页】IC MCU OTP 16KX16 CAN 68PLCC

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PIC18CXX8

DS30475A-page 128

Advanced Information

2000 Microchip Technology Inc.

14.1

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.

14.2

CCP2 Module

Capture/Compare/PWM Register2 (CCPR2) is com-

prised of two 8-bit registers: CCPR2L (low byte) and

CCPR2H (high byte). The CCP2CON register controls

the operation of CCP2. All are readable and writable.

TABLE 14-1:

CCP MODE - TIMER

RESOURCE

14.3

Capture Mode

In Capture mode, CCPR1H:CCPR1L captures the

16-bit value of the TMR1 or TMR3 registers 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 inter-

rupt 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 cap-

tured value will be lost.

14.3.1

CCP PIN CONFIGURATION

In Capture mode, the RC2/CCP1 pin should be config-

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

14.3.2

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 14-2:

INTERACTION OF TWO CCP MODULES

CCP 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.

CCPx Mode CCPy 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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