topic CPU cycles vs. Clock cycles in 8-bit Microcontrollers https://community.nxp.com/t5/8-bit-Microcontrollers/CPU-cycles-vs-Clock-cycles/m-p/130701#M2549 <HTML><HEAD></HEAD><BODY><DIV> </DIV><DIV><DIV>Hello all,</DIV><DIV>I am using code warrior development environment for HC08. When debugging the applications by means of the full chip simulator I can get a feeling of the execution time by reading the amount of "CPU cycles" needed (in the register window).</DIV><DIV>By the way, are the "CPU cycles" corresponding to the number of clocks required to run the application or shall I multiply the CPU cycles by a certain factor to get the number of CLOCK CYCLES?</DIV><DIV>If so, which is this factor for HC08, S08, RS08?</DIV><DIV>Thank you very much...</DIV><DIV>Spa</DIV></DIV></BODY></HTML> Tue, 19 Sep 2006 15:53:31 GMT spa 2006-09-19T15:53:31Z CPU cycles vs. Clock cycles https://community.nxp.com/t5/8-bit-Microcontrollers/CPU-cycles-vs-Clock-cycles/m-p/130701#M2549 <HTML><HEAD></HEAD><BODY><DIV> </DIV><DIV><DIV>Hello all,</DIV><DIV>I am using code warrior development environment for HC08. When debugging the applications by means of the full chip simulator I can get a feeling of the execution time by reading the amount of "CPU cycles" needed (in the register window).</DIV><DIV>By the way, are the "CPU cycles" corresponding to the number of clocks required to run the application or shall I multiply the CPU cycles by a certain factor to get the number of CLOCK CYCLES?</DIV><DIV>If so, which is this factor for HC08, S08, RS08?</DIV><DIV>Thank you very much...</DIV><DIV>Spa</DIV></DIV></BODY></HTML> Tue, 19 Sep 2006 15:53:31 GMT https://community.nxp.com/t5/8-bit-Microcontrollers/CPU-cycles-vs-Clock-cycles/m-p/130701#M2549 spa 2006-09-19T15:53:31Z Re: CPU cycles vs. Clock cycles https://community.nxp.com/t5/8-bit-Microcontrollers/CPU-cycles-vs-Clock-cycles/m-p/130702#M2550 <HTML><HEAD></HEAD><BODY>Hi:<BR /><BR />The HCS08 architecture does not have a fix ratio between number of clock cycles and CPU cycles. It depends of the instruction being executed: some instructions take 2,3, up to 7 clock cycles to execute.<BR /><BR />IF you check the CPU Manual, it gives a list of all assembly instructions with their resepctive number of clock cycles to execute.<BR /><BR />Regards,<BR /><BR />Alex</BODY></HTML> Thu, 21 Sep 2006 02:58:14 GMT https://community.nxp.com/t5/8-bit-Microcontrollers/CPU-cycles-vs-Clock-cycles/m-p/130702#M2550 alex_spotw 2006-09-21T02:58:14Z Re: CPU cycles vs. Clock cycles https://community.nxp.com/t5/8-bit-Microcontrollers/CPU-cycles-vs-Clock-cycles/m-p/130703#M2551 <HTML><HEAD></HEAD><BODY>for example with a 8mhz clock on a mc9s08rd32dwe part:<BR /> one NOP gives about ~3.04microsec delay<P>Message Edited by jah on <SPAN class="date_text">2006-09-21</SPAN> <SPAN class="time_text">12:41 PM</SPAN></P></BODY></HTML> Fri, 22 Sep 2006 00:39:26 GMT https://community.nxp.com/t5/8-bit-Microcontrollers/CPU-cycles-vs-Clock-cycles/m-p/130703#M2551 jah 2006-09-22T00:39:26Z