[Menu]>[Guide to use the PIC]>[873 Hardware]>[SFR]

SFR explanation for PIC16F873(12)

CCP1CON ( CCP1 Control Register ) 17h This register controls the condition of CCP1 feature. The value in the parenthesis is in the condition immediately after the turning on. CCP1X,CCP1Y : PWM Least Significant bits These bits designate low 2 bits of duty cycle of PWM. As for the operation of the CCP, refer to CCP feature of PIC16F873. CCP1M3,CCP1M2,CCP1M1,CCP1M0 : CCP1 Mode Select bits CCP1 M3 CCP1 M2 CCP1 M1 CCP1 M0 CCP1 mode 0 0 0 0 CCP off 0 1 0 0 Capture mode : every falling edge 0 1 0 1 Capture mode : every rising edge 0 1 1 0 Capture mode : every 4th rising edge 0 1 1 1 Capture mode : every 16th rising edge 1 0 0 0 Compare mode : set output on match 1 0 0 1 Compare mode : clear output on match 1 0 1 0 Compare mode : generate software interrupt on match 1 0 1 1 Compare mode : trigger special event and resets TMR1 1 1 x x PWM mode CCPR1L,CCPR1H ( CCP1 register ) 15h, 16h This register is used when operating data by the operation of the CCP. The use changes with each mode. As for the operation of the CCP, refer to CCP feature of PIC16F873. Capture mode The contents of timer1 are stored at the time of the capture. Two registers are combined and works as a 16 bits register. Compare mode It sets the data to compare with timer1. It combines and uses both registers as the 16 bits register. PWM mode It sets data for the duty to CCPR1L. CCPR1H is used for the processing inside and is a read-only register. PR2 ( PWM period register ) 92h This register is used to set the period of the pulse signal by the PWM mode of the CCP. The contents of the PR2 register and the value of timer 2 are compared and the period of the PWM output pulse is decided. As for the operation of the CCP, refer to CCP feature of PIC16F873.