PIC12F1822 MICROCHIP [Microchip Technology], PIC12F1822 Datasheet - Page 208

• Manufacturer Part Number: PIC12F1822
• Description: 8/14-Pin Flash Microcontrollers with nanoWatt XLP Technology
• Manufacturer: MICROCHIP [Microchip Technology]

PIC12F/LF1822/16F/LF1823
23.4
The enhanced PWM mode generates a Pulse-Width
Modulation (PWM) signal on up to four different output
pins with up to 10 bits of resolution. The period, duty
cycle, and resolution are controlled by the following
registers:
• PR2 registers
• T2CON registers
• CCPR1L registers
• CCP1CON registers
The ECCP modules have the following additional PWM
registers which control Auto-shutdown, Auto-restart,
Dead-band Delay and PWM Steering modes:
• CCP1AS registers
• PSTR1CON registers
• PWM1CON registers
The enhanced PWM module can generate the following
four PWM Output modes:
• Single PWM
• Half-Bridge PWM
• Full-Bridge PWM (PIC16F/LF1823 only)
• Single PWM with PWM Steering Mode
To select an Enhanced PWM Output mode, the P1M bits
of the CCP1CON register must be configured
appropriately.
FIGURE 23-5:
DS41413A-page 208
Note 1:
CCPR1H (Slave)
Duty Cycle Registers
Comparator
PWM (Enhanced Mode)
CCPR1L
PR2
TMR2
2:
Comparator
The 8-bit timer TMR1 register is concatenated with the 2-bit internal Q clock, or 2 bits of the prescaler to create the 10-bit time
base.
PIC16F/LF1823 only.
(1)
EXAMPLE SIMPLIFIED BLOCK DIAGRAM OF THE ENHANCED PWM MODE
Clear Timer,
toggle PWM pin and
latch duty cycle
DC1B<1:0>
R
S
P1M<1:0>
Q
Preliminary
PWM1CON
Controller
Output
2
CCP1/P1A
P1C
P1D
P1B
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
bits
appropriately.
Figure 23-5 shows an example of a simplified block
diagram of the Enhanced PWM module.
Table 23-8 shows the pin assignments for various
Enhanced PWM modes.
4
CCP1M<3:0>
(2)
(2)
Note 1: The corresponding TRIS bit must be
CCP1M<3:0>
2: Clearing the CCP1CON register will
3: Any pin not used in the enhanced PWM
4: To
TRISx
TRISx
TRISx
TRISx
cleared to enable the PWM output on the
CCP1 pin.
relinquish control of the CCP1 pin.
mode is available for alternate pin
functions, if applicable.
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.
prevent
in
 2010 Microchip Technology Inc.
the
the
CCP1/P1A
P1B
P1D
P1C
CCP1CON
generation
(2)
(2)
of
register
an