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PIC12F683 Datasheet(PDF) 74 Page - Microchip Technology |
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PIC12F683 Datasheet(HTML) 74 Page - Microchip Technology |
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74 / 148 page  PIC12F683 DS41211B-page 72 Preliminary 2004 Microchip Technology Inc. 11.3 PWM Mode (PWM) In Pulse Width Modulation mode, the CCP1 pin produces up to a 10-bit resolution PWM output. Since the CCP1 pin is multiplexed with the GPIO data latch, the TRISIO<2> bit must be cleared to make the CCP1 pin an output. Figure 11-3 shows a simplified block diagram of the CCP module in PWM mode. For a step-by-step procedure on how to set up the CCP module for PWM operation, see Section 11.3.3 “Setup for PWM Operation”. FIGURE 11-3: SIMPLIFIED PWM BLOCK DIAGRAM A PWM output (Figure 11-4) has a time base (period) and a time that the output stays high (duty cycle). The frequency of the PWM is the inverse of the period (1/period). FIGURE 11-4: PWM OUTPUT 11.3.1 PWM PERIOD The PWM period is specified by writing to the PR2 register. The PWM period can be calculated using the following formula. EQUATION 11-1: PWM frequency is defined as 1/[PWM period]. When TMR2 is equal to PR2, the following three events occur on the next increment cycle: • TMR2 is cleared. • The CCP1 pin is set (Exception: If PWM duty cycle = 0%, the CCP1 pin will not be set). • The PWM duty cycle is latched from CCPR1L into CCPR1H. Note: Clearing the CCP1CON register will force the CCP1 PWM output latch to the default low level. This is not the GPIO data latch. CCPR1L CCPR1H (Slave) Comparator TMR2 Comparator PR2 (Note 1) R Q S Duty Cycle Registers CCP1CON<5:4> Clear Timer, CCP1 pin and latch D.C. TRISIO<2> GP2/CCP1 Note 1: The 8-bit timer is concatenated with 2-bit internal Q clock, or 2 bits of the prescaler, to create 10-bit time base. Note: The Timer2 postscaler (see Section 7.1 “Timer2 Operation”) is not used in the determination of the PWM frequency. The postscaler could be used to have a servo update rate at a different frequency than the PWM output. Period Duty Cycle TMR2 = PR2 TMR2 = Duty Cycle TMR2 = PR2 PWM Period = [(PR2) + 1] • 4 • Tosc • TMR2 Prescale Value |
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