topic RE: HC908QT4 Internal osc. in 8-bit Microcontrollers https://community.nxp.com/t5/8-bit-Microcontrollers/RE-HC908QT4-Internal-osc/m-p/126641#M1166 <HTML><HEAD></HEAD><BODY><DIV>I'm using HC908QT4 and internal osc. I've set the OSCOPT1:0 to 00 in CONFIG2 but the OSC2 on PTA4 (OSC2EN=1) shown it's only ~3.9MHz not 12.8MHz as stated in the datasheet.</DIV><DIV>&nbsp;</DIV><DIV>Any suggestion what goes wrong? Thx!</DIV><DIV>&nbsp;</DIV></BODY></HTML> Mon, 20 Feb 2006 23:53:13 GMT wf_lee 2006-02-20T23:53:13Z RE: HC908QT4 Internal osc. https://community.nxp.com/t5/8-bit-Microcontrollers/RE-HC908QT4-Internal-osc/m-p/126641#M1166 <HTML><HEAD></HEAD><BODY><DIV>I'm using HC908QT4 and internal osc. I've set the OSCOPT1:0 to 00 in CONFIG2 but the OSC2 on PTA4 (OSC2EN=1) shown it's only ~3.9MHz not 12.8MHz as stated in the datasheet.</DIV><DIV>&nbsp;</DIV><DIV>Any suggestion what goes wrong? Thx!</DIV><DIV>&nbsp;</DIV></BODY></HTML> Mon, 20 Feb 2006 23:53:13 GMT https://community.nxp.com/t5/8-bit-Microcontrollers/RE-HC908QT4-Internal-osc/m-p/126641#M1166 wf_lee 2006-02-20T23:53:13Z Re: RE: HC908QT4 Internal osc. https://community.nxp.com/t5/8-bit-Microcontrollers/RE-HC908QT4-Internal-osc/m-p/126642#M1167 <HTML><HEAD></HEAD><BODY>Hi wf.lee<BR />Since the bus clock is one fourth of f osc -&gt; this is correct! The internal osc runs at 12.8MHz (nominal, +/-25%) so maximum bus clock frequency will bee 4MHz (means f osz = 16MHz). For a adjusted osz. frquency you have to programm the OSCTRIM register with the right value.<BR /><BR />Saluti joerg</BODY></HTML> Wed, 22 Feb 2006 04:10:54 GMT https://community.nxp.com/t5/8-bit-Microcontrollers/RE-HC908QT4-Internal-osc/m-p/126642#M1167 joerg 2006-02-22T04:10:54Z