https://community.nxp.com/t5/CodeWarrior-for-MCU/digital-to-analog-converter/m-p/126951#M429 <HTML><HEAD></HEAD><BODY><DIV>Hi!</DIV><DIV>&nbsp;</DIV><DIV>I´m&nbsp; using the DAC on the mc9s12e64 the first time and I´m woundering about the both 8 bit left and right oriented data register DACD. What´s the advantage of this??</DIV><DIV>&nbsp;</DIV><DIV>Thanks,</DIV><DIV>Thomas</DIV></BODY></HTML> Thu, 17 Aug 2006 15:46:20 GMT ThomasH 2006-08-17T15:46:20Z https://community.nxp.com/t5/CodeWarrior-for-MCU/digital-to-analog-converter/m-p/126951#M429 <HTML><HEAD></HEAD><BODY><DIV>Hi!</DIV><DIV>&nbsp;</DIV><DIV>I´m&nbsp; using the DAC on the mc9s12e64 the first time and I´m woundering about the both 8 bit left and right oriented data register DACD. What´s the advantage of this??</DIV><DIV>&nbsp;</DIV><DIV>Thanks,</DIV><DIV>Thomas</DIV></BODY></HTML> Thu, 17 Aug 2006 15:46:20 GMT https://community.nxp.com/t5/CodeWarrior-for-MCU/digital-to-analog-converter/m-p/126951#M429 ThomasH 2006-08-17T15:46:20Z https://community.nxp.com/t5/CodeWarrior-for-MCU/digital-to-analog-converter/m-p/126952#M430 <HTML><HEAD></HEAD><BODY><DIV></DIV><P>When trying to do computation rapidly on real-world quantities, it is often helpful to look at integers as fractions of&nbsp;a "full scale" value.&nbsp; This has the nice feature that multiplication of two quantities less than 1 will always give a result less than 1.&nbsp; So to scale a quantity, you just do a multiply and take the most significant bits.&nbsp; No shifting involved, just word operations.</P><P>Its real easy in assembler, but a little awkward in C, so hiding it in some function written in assembly may be a good idea.&nbsp;</P><P>It seems like a fractional arithmetic class in C++ would make this easy, but I'm not aware of one.&nbsp; (I haven't had occasion to look.)</P></BODY></HTML> Fri, 18 Aug 2006 00:25:28 GMT https://community.nxp.com/t5/CodeWarrior-for-MCU/digital-to-analog-converter/m-p/126952#M430 SteveRussell 2006-08-18T00:25:28Z