S12 / MagniV Microcontrollersのトピック[Help]Why my PWM output is AC (sine wave) not DC?? https://community.nxp.com/t5/S12-MagniV-Microcontrollers/Help-Why-my-PWM-output-is-AC-sine-wave-not-DC/m-p/219296#M9196 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>&nbsp;</P><P>I v use S12xe, the board is i made myself, now I want to use PWM to output 2.5V DC (50% Duty), I v not use filter circuit, just direct connect with the PWM output pin, but the funny thing is the output is 2.5 v AC &nbsp; (from the oscillograph, i v got a sine wave), the frequence i set to 1MHz, i v use both hardware PWM and software PWM, the situation is the same. Is some one can help me to give some advise, that maybe&nbsp; where is the problem, thanks&nbsp; a lo.</P></BODY></HTML> Sun, 04 Oct 2009 03:29:31 GMT jaky0 2009-10-04T03:29:31Z [Help]Why my PWM output is AC (sine wave) not DC?? https://community.nxp.com/t5/S12-MagniV-Microcontrollers/Help-Why-my-PWM-output-is-AC-sine-wave-not-DC/m-p/219296#M9196 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>&nbsp;</P><P>I v use S12xe, the board is i made myself, now I want to use PWM to output 2.5V DC (50% Duty), I v not use filter circuit, just direct connect with the PWM output pin, but the funny thing is the output is 2.5 v AC &nbsp; (from the oscillograph, i v got a sine wave), the frequence i set to 1MHz, i v use both hardware PWM and software PWM, the situation is the same. Is some one can help me to give some advise, that maybe&nbsp; where is the problem, thanks&nbsp; a lo.</P></BODY></HTML> Sun, 04 Oct 2009 03:29:31 GMT https://community.nxp.com/t5/S12-MagniV-Microcontrollers/Help-Why-my-PWM-output-is-AC-sine-wave-not-DC/m-p/219296#M9196 jaky0 2009-10-04T03:29:31Z Re: [Help]Why my PWM output is AC (sine wave) not DC?? https://community.nxp.com/t5/S12-MagniV-Microcontrollers/Help-Why-my-PWM-output-is-AC-sine-wave-not-DC/m-p/219297#M9197 <HTML><HEAD></HEAD><BODY>make sure&nbsp;the&nbsp;oscilloscope ground connects to ground of your system in test.</BODY></HTML> Mon, 05 Oct 2009 09:37:47 GMT https://community.nxp.com/t5/S12-MagniV-Microcontrollers/Help-Why-my-PWM-output-is-AC-sine-wave-not-DC/m-p/219297#M9197 Xbot 2009-10-05T09:37:47Z