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PIC12F683-E/MDQTP датащи(PDF) 80 Page - Microchip Technology

номер детали PIC12F683-E/MDQTP
подробное описание детали  8-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology
PDF  176 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC12F683-E/MDQTP датащи(HTML) 80 Page - Microchip Technology

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PIC12F683
DS41211D-page 78
© 2007 Microchip Technology Inc.
11.3
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. Since the CCP1 pin is multiplexed
with the PORT data latch, the TRIS for that pin must be
cleared to enable the CCP1 pin output driver.
Figure 11-1 shows a simplified block diagram of PWM
operation.
Figure 11-4 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, see Section 11.3.7
“Setup for PWM Operation”.
FIGURE 11-3:
SIMPLIFIED PWM BLOCK
DIAGRAM
The PWM output (Figure 11-4) has a time base
(period) and a time that the output stays high (duty
cycle).
FIGURE 11-4:
CCP PWM OUTPUT
Note:
Clearing
the
CCP1CON
register
will
relinquish CCP1 control of the CCP1 pin.
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
Pin
Comparator
Period
Pulse Width
TMR2 = 0
TMR2 = CCPR1L:CCP1CON<5:4>
TMR2 = PR2



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