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PIC16F946-E/MLQTP bảng dữ liệu(PDF) 217 Page - Microchip Technology

tên linh kiện PIC16F946-E/MLQTP
Giải thích chi tiết về linh kiện  28/40/44/64-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt Technology
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nhà sản xuất  MICROCHIP [Microchip Technology]
Trang chủ  http://www.microchip.com
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PIC16F946-E/MLQTP bảng dữ liệu(HTML) 217 Page - Microchip Technology

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© 2007 Microchip Technology Inc.
DS41250F-page 215
PIC16F913/914/916/917/946
15.3
PWM Mode
The PWM mode generates a Pulse-Width Modulated
signal on the CCPx pin. The duty cycle, period and
resolution are determined by the following registers:
•PR2
•T2CON
• CCPRxL
• CCPxCON
In Pulse-Width Modulation (PWM) mode, the CCP
module produces up to a 10-bit resolution PWM output
on the CCPx pin. Since the CCPx pin is multiplexed
with the PORT data latch, the TRIS for that pin must be
cleared to enable the CCPx pin output driver.
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, see Section 15.3.7
“Setup for PWM Operation”.
FIGURE 15-3:
SIMPLIFIED PWM BLOCK
DIAGRAM
The PWM output (Figure 15-2) has a time base
(period) and a time that the output stays high (duty
cycle).
FIGURE 15-4:
CCP PWM OUTPUT
Note:
Clearing the CCPxCON register will
relinquish CCPx control of the CCPx pin.
CCPRxL
CCPRxH(2) (Slave)
Comparator
TMR2
PR2
(1)
RQ
S
Duty Cycle Registers
CCPxCON<5:4>
Clear Timer2,
toggle CCPx 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, CCPRxH is a read-only register.
TRIS
CCPx
Comparator
Period
Pulse Width
TMR2 = 0
TMR2 = CCPRxL:CCPxCON<5:4>
TMR2 = PR2



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