8-bit MicrocontrollersのトピックP87C51 replacement https://community.nxp.com/t5/8-bit-Microcontrollers/P87C51-replacement/m-p/716086#M22482 <HTML><HEAD></HEAD><BODY><P>I am looking for a replacement for the now obsolete P87C51SBAA,512 processor.</P><P>I have fitted the second generation P87C51MC2BA/02,529 device, programmed with the same .hex file as used for the old part.</P><P>I notice in the data sheet for the new part that it runs instructions at twice the speed of the old part</P><P>The critical timings in our application make use of Timer 1 so I&nbsp;did not expect them to change.</P><P>However, I find that these timings have halved when the code is run in the new part.</P><P>Is this because the internal clock runs at twice the speed, resulting in timer time-out periods also being halved?</P></BODY></HTML> Fri, 12 Jan 2018 11:53:47 GMT nigelhale 2018-01-12T11:53:47Z P87C51 replacement https://community.nxp.com/t5/8-bit-Microcontrollers/P87C51-replacement/m-p/716086#M22482 <HTML><HEAD></HEAD><BODY><P>I am looking for a replacement for the now obsolete P87C51SBAA,512 processor.</P><P>I have fitted the second generation P87C51MC2BA/02,529 device, programmed with the same .hex file as used for the old part.</P><P>I notice in the data sheet for the new part that it runs instructions at twice the speed of the old part</P><P>The critical timings in our application make use of Timer 1 so I&nbsp;did not expect them to change.</P><P>However, I find that these timings have halved when the code is run in the new part.</P><P>Is this because the internal clock runs at twice the speed, resulting in timer time-out periods also being halved?</P></BODY></HTML> Fri, 12 Jan 2018 11:53:47 GMT https://community.nxp.com/t5/8-bit-Microcontrollers/P87C51-replacement/m-p/716086#M22482 nigelhale 2018-01-12T11:53:47Z