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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC16F882-I датащи(PDF) 130 Page - Microchip Technology |
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PIC16F882-I датащи(HTML) 130 Page - Microchip Technology |
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130 / 328 page  PIC16F882/883/884/886/887 DS41291F-page 128 © 2009 Microchip Technology Inc. 11.5 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 11-3 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 11.5.7 “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 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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