PIC18F25K80 MICROCHIP [Microchip Technology], PIC18F25K80 Datasheet - Page 277

• Manufacturer Part Number: PIC18F25K80
• Manufacturer: MICROCHIP [Microchip Technology]

20.4
The Enhanced PWM mode can generate a PWM signal
on up to four different output pins with up to 10 bits of
resolution. It can do this through four different PWM
Output modes:
• Single PWM
• Half-Bridge PWM
• Full-Bridge PWM, Forward mode
• Full-Bridge PWM, Reverse mode
To select an Enhanced PWM mode, the P1M bits of the
CCP1CON register must be set appropriately.
FIGURE 20-3:
 2011 Microchip Technology Inc.
Note 1: The TRIS register value for each PWM output must be configured appropriately.
Note 1: The 8-bit TMR2 register is concatenated with the 2-bit internal Q clock, or 2 bits of the prescaler, to create
CCPR1H (Slave)
2: Any pin not used by an Enhanced PWM mode is available for alternate pin functions.
PWM (Enhanced Mode)
Duty Cycle Registers
Comparator
CCPR1L
PR2
TMR2
Comparator
the 10-bit time base.
EXAMPLE SIMPLIFIED BLOCK DIAGRAM OF THE ENHANCED PWM MODE
(1)
Clear Timer2,
Toggle PWM Pin and
Latch Duty Cycle
DC1B<1:0>
R
S
P1M<1:0>
Q
Preliminary
ECCP1DEL
Controller
PIC18F66K80 FAMILY
ECCP1/P1A
Output
2
The PWM outputs are multiplexed with I/O pins and are
designated: P1A, P1B, P1C and P1D. The polarity of the
PWM pins is configurable and is selected by setting the
CCP1M bits in the CCP1CON register appropriately.
Table 20-1
Enhanced PWM mode.
Figure 20-3
diagram of the Enhanced PWM module.
Note:
P1C
P1B
P1D
4
CCP1M<3:0>
To
incomplete waveform when the PWM is
first enabled, the ECCP module waits until
the start of a new PWM period before
generating a PWM signal.
provides the pin assignments for each
provides an example of a simplified block
TRIS
TRIS
TRIS
TRIS
prevent
the
generation
ECCP1/Output Pi
Output Pi
Output Pi
Output Pi
DS39977C-page 277
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