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PIC16F720-E/ML датащи(PDF) 114 Page - Microchip Technology

номер детали PIC16F720-E/ML
подробное описание детали  20-Pin Flash Microcontrollers with nanoWatt XLP Technology
PDF  244 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16F720-E/ML датащи(HTML) 114 Page - Microchip Technology

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PIC16F/LF720/721
DS41430A-page 114
 2010 Microchip Technology Inc.
15.3
PWM Mode
The PWM mode generates a Pulse-Width Modulated
signal on the CCP1 pin. The duty cycle, period and
resolution are determined by the following registers:
•PR2
•T2CON
• CCPR1L
• CCP1CON
In Pulse-Width Modulation (PWM) mode, the CCP
module produces up to a 10-bit resolution PWM output
on the CCP1 pin.
Figure 15-3 shows a simplified block diagram of PWM
operation.
Figure 15-4 shows a typical waveform of the PWM
signal.
For a step-by-step procedure on how to set up the CCP
module for PWM operation, refer to Section 15.3.8
“Setup for PWM Operation”.
FIGURE 15-3:
SIMPLIFIED PWM BLOCK
DIAGRAM
The PWM output (Figure 15-4) has a time base
(period) and a time that the output stays high (duty
cycle).
FIGURE 15-4:
CCP PWM OUTPUT
15.3.1
CCPX PIN CONFIGURATION
In PWM mode, the CCP1 pin is multiplexed with the
PORT data latch. The user must configure the CCP1
pin as an output by clearing the associated TRIS bit.
CCPR1L
CCPR1H(2) (Slave)
Comparator
TMR2
PR2
(1)
RQ
S
Duty Cycle Registers
CCP1CON<5:4>
Clear Timer2,
toggle CCP1 pin and
latch duty cycle
Note
1:
The 8-bit timer TMR2 register is concatenated with
the 2-bit internal system clock (FOSC), or 2 bits of the
prescaler, to create the 10-bit time base.
2:
In PWM mode, CCPR1H is a read-only register.
TRIS
CCP1
Comparator
Note:
Clearing the CCP1CON register will
relinquish CCP1 control of the CCP1 pin.
Period
Pulse Width
TMR2 = 0
TMR2 = CCPR1L:CCP1CON<5:4>
TMR2 = PR2



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