Datasheet

© 2009 Microchip Technology Inc. DS41341E-page 135
PIC16F72X/PIC16LF72X
15.0 CAPTURE/COMPARE/PWM
(CCP) MODULE
The Capture/Compare/PWM module is a peripheral
which allows the user to time and control different
events. In Capture mode, the peripheral allows the
timing of the duration of an event. The Compare mode
allows the user to trigger an external event when a
predetermined amount of time has expired. The PWM
mode can generate a Pulse-Width Modulated signal of
varying frequency and duty cycle.
The timer resources used by the module are shown in
Table 15-1.
Additional information on CCP modules is available in
the Application Note AN594, “Using the CCP Modules”
(DS00594).
TABLE 15-1: CCP MODE – TIMER
RESOURCES REQUIRED
TABLE 15-2: INTERACTION OF TWO CCP MODULES
CCP Mode Timer Resource
Capture Timer1
Compare Timer1
PWM Timer2
CCP1 Mode CCP2 Mode Interaction
Capture Capture
Same TMR1 time base
Capture Compare Same TMR1 time base
(1, 2)
Compare Compare Same TMR1 time base
(1, 2)
PWM PWM The PWMs will have the same frequency and update rate (TMR2 interrupt).
The rising edges will be aligned.
PWM Capture None
PWM Compare None
Note 1: If CCP2 is configured as a Special Event Trigger, CCP1 will clear Timer1, affecting the value captured on
the CCP2 pin.
2: If CCP1 is in Capture mode and CCP2 is configured as a Special Event Trigger, CCP2 will clear Timer1,
affecting the value captured on the CCP1 pin.
Note: CCPRx and CCPx throughout this
document refer to CCPR1 or CCPR2 and
CCP1 or CCP2, respectively.