topic Re: S08QG External Oscillator Connection? in 8-bit Microcontrollers https://community.nxp.com/t5/8-bit-Microcontrollers/S08QG-External-Oscillator-Connection/m-p/148526#M7722 <HTML><HEAD></HEAD><BODY><P>Yes, you can.</P><P>&nbsp;</P><P>EREFS in ICSC2 decides whether the oscillator or an external clock is used. &nbsp; In the latter case, the XTAL pin is freed for I/O use.&nbsp; Use EREFS=0 (reset default) for external clock.&nbsp;&nbsp; But you must also set IREFS=0 in ICSC1 to switch from internal to external clock.</P></BODY></HTML> Fri, 23 Oct 2009 02:48:28 GMT tonyp 2009-10-23T02:48:28Z S08QG External Oscillator Connection? https://community.nxp.com/t5/8-bit-Microcontrollers/S08QG-External-Oscillator-Connection/m-p/148525#M7721 <HTML><HEAD></HEAD><BODY><SPAN>New project, internal clock was fine for my previous first with project with the part, and I am at the pin assignment and product functionality part of the next.&nbsp; I may want to time an event with more precision than the internal clock.&nbsp; With an external crystal taking up two pins, I have none left for the timing function or have to give up some other function.&nbsp; Can I just use one of those oscillator modules?&nbsp; EXTAL seem right for the connection but I have not yet located a clear cut statement in the data sheet to that effect.&nbsp; Cost is not much of an issue.</SPAN></BODY></HTML> Fri, 23 Oct 2009 01:52:44 GMT https://community.nxp.com/t5/8-bit-Microcontrollers/S08QG-External-Oscillator-Connection/m-p/148525#M7721 DSbob 2009-10-23T01:52:44Z Re: S08QG External Oscillator Connection? https://community.nxp.com/t5/8-bit-Microcontrollers/S08QG-External-Oscillator-Connection/m-p/148526#M7722 <HTML><HEAD></HEAD><BODY><P>Yes, you can.</P><P>&nbsp;</P><P>EREFS in ICSC2 decides whether the oscillator or an external clock is used. &nbsp; In the latter case, the XTAL pin is freed for I/O use.&nbsp; Use EREFS=0 (reset default) for external clock.&nbsp;&nbsp; But you must also set IREFS=0 in ICSC1 to switch from internal to external clock.</P></BODY></HTML> Fri, 23 Oct 2009 02:48:28 GMT https://community.nxp.com/t5/8-bit-Microcontrollers/S08QG-External-Oscillator-Connection/m-p/148526#M7722 tonyp 2009-10-23T02:48:28Z