topic Re: Timer malfunction 9S12DP512 in S12 / MagniV Microcontrollers https://community.nxp.com/t5/S12-MagniV-Microcontrollers/Timer-malfunction-9S12DP512/m-p/193756#M7654 <HTML><HEAD></HEAD><BODY><P>When fast flag clear is set you can't clear timer flags and modulus down counter flag writing ones&nbsp;to flag bits. I guess this is your case. It's not eenough to clear timer flags reading capture registers you also need to read MCCNT to clear MCZF.</P></BODY></HTML> Mon, 28 Mar 2011 12:00:29 GMT kef 2011-03-28T12:00:29Z Timer malfunction 9S12DP512 https://community.nxp.com/t5/S12-MagniV-Microcontrollers/Timer-malfunction-9S12DP512/m-p/193755#M7653 <HTML><HEAD></HEAD><BODY><P>My application also uses the Modulus system which generates an interrupt when downcounter reaches zero. The counter automatically reloads. This may or may not be related to the following problem.</P><P>&nbsp;</P><P>The ECT_16B8C Block User Guide V01.02 states "When TFFCA bit in TSCR register is set, a read from an input capture channel ($10-$1F) will cause the corresponding channel flag CnF to be cleared".</P><P>&nbsp;</P><P>The Timer oscillator in this application freeruns and is used for input capture interrupts.&nbsp; If the TFFCA bit in TSCR1 is set to provide fast interrupt flag clearing on input capture, then the micro will hang up. A better solution, but which takes more time, is to clear the TFLG1 interrupt flag in the interrupt service routine.</P><P>&nbsp;</P><P>Does anyone know if this is a defect in the chip?</P></BODY></HTML> Mon, 28 Mar 2011 07:11:55 GMT https://community.nxp.com/t5/S12-MagniV-Microcontrollers/Timer-malfunction-9S12DP512/m-p/193755#M7653 astro_goto 2011-03-28T07:11:55Z Re: Timer malfunction 9S12DP512 https://community.nxp.com/t5/S12-MagniV-Microcontrollers/Timer-malfunction-9S12DP512/m-p/193756#M7654 <HTML><HEAD></HEAD><BODY><P>When fast flag clear is set you can't clear timer flags and modulus down counter flag writing ones&nbsp;to flag bits. I guess this is your case. It's not eenough to clear timer flags reading capture registers you also need to read MCCNT to clear MCZF.</P></BODY></HTML> Mon, 28 Mar 2011 12:00:29 GMT https://community.nxp.com/t5/S12-MagniV-Microcontrollers/Timer-malfunction-9S12DP512/m-p/193756#M7654 kef 2011-03-28T12:00:29Z