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2010 Microchip Technology Inc.
DS39774D-page 175
PIC18F85J11 FAMILY
16.4
PWM Mode
In Pulse-Width Modulation (PWM) mode, the CCP2 pin
produces up to a 10-bit resolution PWM output. Since
the CCP2 pin is multiplexed with a PORTB, PORTC or
PORTE data latch, the appropriate TRIS bit must be
cleared to make the CCP2 pin an output.
Figure 16-4 shows a simplified block diagram of the
CCP1 module in PWM mode.
For a step-by-step procedure on how to set up the CCP
module for PWM operation, see Section 16.4.3
FIGURE 16-4:
SIMPLIFIED PWM BLOCK
DIAGRAM
A PWM output (Figure 16-5) has a time base (period)
and a time that the output stays high (duty cycle). The
frequency of the PWM is the inverse of the period
(1/period).
FIGURE 16-5:
PWM OUTPUT
16.4.1
PWM PERIOD
The PWM period is specified by writing to the PR2
register. The PWM period can be calculated using the
following formula:
EQUATION 16-1:
PWM frequency is defined as 1/[PWM period].
When TMR2 is equal to PR2, the following three events
occur on the next increment cycle:
TMR2 is cleared
The CCP2 pin is set (exception: if PWM duty
cycle = 0%, the CCP2 pin will not be set)
The PWM duty cycle is latched from CCPR2L into
CCPR2H
Note:
Clearing the CCP2CON register will force
the RB3, RC1 or RE7 output latch
(depending on device configuration) to the
default low level. This is not the PORTB,
PORTC or PORTE I/O data latch.
CCPR1L
CCPR1H (Slave)
Comparator
TMR2
Comparator
PR2
(Note 1)
R
Q
S
Duty Cycle Registers
CCP1CON<5:4>
Clear Timer,
CCP1 pin and
latch D.C.
TRISC<2>
RC2/CCP1
Note 1:
The 8-bit TMR2 value is concatenated with the 2-bit
internal Q clock, or 2 bits of the prescaler, to create
the 10-bit time base.
Note:
The Timer2 postscalers (see Section 14.0
“Timer2 Module”) are not used in the
determination of the PWM frequency. The
postscaler could be used to have a servo
update rate at a different frequency than
the PWM output.
Period
Duty Cycle
TMR2 = PR2
TMR2 = Duty Cycle
TMR2 = PR2
PWM Period = (PR2) + 1] 4 TOSC
(TMR2 Prescale Value)
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