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PIC18F1220E/PQTP Datasheet(PDF) 127 Page - Microchip Technology |
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PIC18F1220E/PQTP Datasheet(HTML) 127 Page - Microchip Technology |
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127 / 308 page  © 2007 Microchip Technology Inc. DS39605F-page 125 PIC18F1220/1320 FIGURE 15-10: PWM DIRECTION CHANGE (ACTIVE-HIGH) FIGURE 15-11: PWM DIRECTION CHANGE AT NEAR 100% DUTY CYCLE (ACTIVE-HIGH) DC PWM Period(1) SIGNAL Note 1: The direction bit in the CCP1 Control register (CCP1CON<7>) is written any time during the PWM cycle. 2: When changing directions, the P1A and P1C toggle one Timer2 count before the end of the current PWM cycle. The modulated P1B and P1D signals are inactive at this time. PWM Period One Timer2 Count(2) P1A P1B P1C P1D DC Forward Period Reverse Period P1A tON tOFF t = tOFF – tON P1B P1C P1D External Switch D Potential Shoot-Through Current Note 1: tON is the turn-on delay of power switch QC and its driver. 2: tOFF is the turn-off delay of power switch QD and its driver. External Switch C t1 DC DC |
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