topic [68HC908GZ60] Using MMDS and EML08GZ. Changing VREFH in 8-bit Microcontrollers https://community.nxp.com/t5/8-bit-Microcontrollers/68HC908GZ60-Using-MMDS-and-EML08GZ-Changing-VREFH/m-p/123818#M18 <HTML><HEAD></HEAD><BODY><DIV><SPAN style="color: #ff0000;">This message contains an entire topic ported from a separate forum. The original message and all replies are in this single message. We have seeded this new forum with selected information that we expect will be of value to you as you search for answers to your questions.</SPAN></DIV><P><SPAN style="color: #ff0000;"><SPAN style=": ; color: #000000;"><STRONG>Posted: Thu Apr 14, 2005 8:42 am</STRONG><SPAN class="gen">&nbsp;</SPAN>&nbsp;&nbsp;&nbsp;</SPAN></SPAN></P><P><SPAN style="color: #ff0000;"><SPAN class="postdetails"><SPAN class="postbody"><SPAN style="COLOR: darkblue;">I'm looking for some advice with my emulator question. I'm emulating the GZ60 with the MMDS/EML08GZ combination. Everything works OK, but I want to</SPAN> <SPAN style="COLOR: darkred;">CHANGE VREFH.</SPAN> <SPAN style="color: #000000;"><BR /><BR /></SPAN><SPAN style="COLOR: darkblue;">The emulation daughter card simply connects VRFH to VDDA via a 38R ferrite bead. I have my own reference voltage on the target, and wonder how to configure the EML board to accept my reference. My Vref is &lt; VDDA.</SPAN> <SPAN style="color: #000000;"><BR /><BR /><SPAN style="COLOR: black;">I'd appreciate any advice.</SPAN></SPAN></SPAN></SPAN></SPAN></P><P><SPAN style="color: #ff0000;"><SPAN class="postdetails"><SPAN style="color: #000000; COLOR: black;"><SPAN class="postdetails"><STRONG>Posted: Thu Apr 14, 2005 12:45 pm</STRONG><SPAN class="gen">&nbsp;</SPAN>&nbsp;&nbsp;&nbsp;</SPAN></SPAN></SPAN></SPAN></P><P><SPAN style="color: #ff0000;"><SPAN class="postdetails"><SPAN class="postbody"><SPAN style="color: #000000; COLOR: black;"><SPAN class="postdetails"><SPAN class="postbody">Hi,<BR /><BR /> I see your concern, but VREFH shares its pin with VDDAD (analogue supply). <A href="http://www.freegeeks.net/modules/Forums/images/smiles/icon_sad.gif"><IMG alt="Sad" border="0" src="http://www.freegeeks.net/modules/Forums/images/smiles/icon_sad.gif" /></A><BR /> As VDDAD should be at same level as VDD, I don't advise you to change its level.<BR /> You could choose another MCU with VREFH separated, like AZ60A...<BR /><BR /></SPAN></SPAN></SPAN> </SPAN></SPAN></SPAN></P><DIV><BR /></DIV></BODY></HTML> Fri, 20 Jan 2006 06:53:36 GMT RChapman 2006-01-20T06:53:36Z [68HC908GZ60] Using MMDS and EML08GZ. Changing VREFH https://community.nxp.com/t5/8-bit-Microcontrollers/68HC908GZ60-Using-MMDS-and-EML08GZ-Changing-VREFH/m-p/123818#M18 <HTML><HEAD></HEAD><BODY><DIV><SPAN style="color: #ff0000;">This message contains an entire topic ported from a separate forum. The original message and all replies are in this single message. We have seeded this new forum with selected information that we expect will be of value to you as you search for answers to your questions.</SPAN></DIV><P><SPAN style="color: #ff0000;"><SPAN style=": ; color: #000000;"><STRONG>Posted: Thu Apr 14, 2005 8:42 am</STRONG><SPAN class="gen">&nbsp;</SPAN>&nbsp;&nbsp;&nbsp;</SPAN></SPAN></P><P><SPAN style="color: #ff0000;"><SPAN class="postdetails"><SPAN class="postbody"><SPAN style="COLOR: darkblue;">I'm looking for some advice with my emulator question. I'm emulating the GZ60 with the MMDS/EML08GZ combination. Everything works OK, but I want to</SPAN> <SPAN style="COLOR: darkred;">CHANGE VREFH.</SPAN> <SPAN style="color: #000000;"><BR /><BR /></SPAN><SPAN style="COLOR: darkblue;">The emulation daughter card simply connects VRFH to VDDA via a 38R ferrite bead. I have my own reference voltage on the target, and wonder how to configure the EML board to accept my reference. My Vref is &lt; VDDA.</SPAN> <SPAN style="color: #000000;"><BR /><BR /><SPAN style="COLOR: black;">I'd appreciate any advice.</SPAN></SPAN></SPAN></SPAN></SPAN></P><P><SPAN style="color: #ff0000;"><SPAN class="postdetails"><SPAN style="color: #000000; COLOR: black;"><SPAN class="postdetails"><STRONG>Posted: Thu Apr 14, 2005 12:45 pm</STRONG><SPAN class="gen">&nbsp;</SPAN>&nbsp;&nbsp;&nbsp;</SPAN></SPAN></SPAN></SPAN></P><P><SPAN style="color: #ff0000;"><SPAN class="postdetails"><SPAN class="postbody"><SPAN style="color: #000000; COLOR: black;"><SPAN class="postdetails"><SPAN class="postbody">Hi,<BR /><BR /> I see your concern, but VREFH shares its pin with VDDAD (analogue supply). <A href="http://www.freegeeks.net/modules/Forums/images/smiles/icon_sad.gif"><IMG alt="Sad" border="0" src="http://www.freegeeks.net/modules/Forums/images/smiles/icon_sad.gif" /></A><BR /> As VDDAD should be at same level as VDD, I don't advise you to change its level.<BR /> You could choose another MCU with VREFH separated, like AZ60A...<BR /><BR /></SPAN></SPAN></SPAN> </SPAN></SPAN></SPAN></P><DIV><BR /></DIV></BODY></HTML> Fri, 20 Jan 2006 06:53:36 GMT https://community.nxp.com/t5/8-bit-Microcontrollers/68HC908GZ60-Using-MMDS-and-EML08GZ-Changing-VREFH/m-p/123818#M18 RChapman 2006-01-20T06:53:36Z