Datasheet

PIC18F6310/6410/8310/8410
DS39635C-page 168  2010 Microchip Technology Inc.
16.1 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.
16.1.1 CCP MODULES AND TIMER
RESOURCES
The CCP 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 16-1: CCP MODE – TIMER
RESOURCE
The assignment of a particular timer to a module is
determined by the Timer-to-CCP enable bits in the
T3CON register (Register 15-1). All three 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.
Depending on the configuration selected, up to three
timers may be active at once, with modules in the same
configuration (Capture/Compare or PWM) sharing
timer resources. The possible configurations are
shown in Figure 16-1.
16.1.2 CCP2 PIN ASSIGNMENT
The CCP2MX Configuration bit determines if CCP2 is
multiplexed to its default or alternate assignment. By
default, CCP2 is assigned to RC1 (CCP2MX = 1). If
CCP2MX is cleared, CCP2 is multiplexed with either
RE7 or RB3 (RE7 is the only alternative assignment for
64-pin devices).
For any device in Microcontroller mode, the alternate
CCP2 assignment is RE7. For 80-pin devices in
Microcprocessor, Extended Microcontroller or Microcon-
troller with Boot Block mode, the alternate assignment is
RB3. Note that RE7 is the only alternative assignment for
64-pin devices.
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.
FIGURE 16-1: CCP AND TIMER INTERCONNECT CONFIGURATIONS
CCP Mode Timer Resource
Capture
Compare
PWM
Timer1 or Timer3
Timer1 or Timer3
Timer2
Timer1 is used for all
Capture and Compare
operations for all three
CCP modules. Timer2
is used for PWM oper-
ations for all three CCP
modules. Timer3 is not
used.
All modules may share
Timer1 and Timer2
resources as common
time bases.
Timer1 is used for
Capture and Compare
operations for CCP1
and Timer 3 is used for
CCP2 and CCP3.
All three modules
share Timer2 as a
common time base for
PWM operation.
Timer3 is used for all
Capture and Compare
operations for all three
CCP modules. Timer2
is used for PWM oper-
ations for all three CCP
modules. Timer1 is not
used.
All modules may share
Timer2 and Timer3
resources as common
time bases.
TMR1
TMR2
TMR3
CCP3
CCP2
CCP1
TMR1
TMR2
TMR3
CCP3
CCP2
CCP1
TMR1
TMR2
TMR3
CCP3
CCP2
CCP1
TMR1 TMR3
TMR2
CCP3
CCP2
CCP1
T3CCP<2:1> = 00 T3CCP<2:1> = 01 T3CCP<2:1> = 10 T3CCP<2:1> = 11
Timer1 is used for
Capture and Compare
operations for CCP1
and CCP2. Timer 3 is
used for CCP3.
All three modules
share Timer2 as a
common time base for
PWM operation.