topic Problem with HCS08AW60 in 3.3v system in 8-bit Microcontrollers https://community.nxp.com/t5/8-bit-Microcontrollers/Problem-with-HCS08AW60-in-3-3v-system/m-p/134968#M3899 <HTML><HEAD></HEAD><BODY><SPAN>Hello,</SPAN><BR /><SPAN>I am operating an AW60 in a 3.3v system.</SPAN><BR /><SPAN>By default on power-on reset the LVD system in enabled to reset the uP when the voltage drops below the lower LVD threshold (2.56v). On two occasions I have found that the system is being held in reset because the threshold has been changed to the upper level(4.4v) relevant for a 5v system. I have proved this by increasing the supply voltage to around 5v and the system starts, lower it back to 3.3 and the uP is held in reset without performing a POR.</SPAN><BR /><BR /><SPAN>I have not actively changed the LVWV bit in SPMSC2 to a "1". The bit changing to a "1" in a 3.3v system is fatal!</SPAN><BR /><BR /><SPAN>My I don't think my code is crashing and it is highly unlikely to be setting this bit, or is there a problem with the part itself.</SPAN><BR /><BR /><SPAN>I would prefer that the threshold selection bit was set in flash at programming time!</SPAN><BR /><BR /><SPAN>I look forward to your comments.</SPAN><BR /><BR /><SPAN>Regards</SPAN><BR /><SPAN>Phil Green</SPAN></BODY></HTML> Tue, 31 Oct 2006 18:09:06 GMT PhilG 2006-10-31T18:09:06Z Problem with HCS08AW60 in 3.3v system https://community.nxp.com/t5/8-bit-Microcontrollers/Problem-with-HCS08AW60-in-3-3v-system/m-p/134968#M3899 <HTML><HEAD></HEAD><BODY><SPAN>Hello,</SPAN><BR /><SPAN>I am operating an AW60 in a 3.3v system.</SPAN><BR /><SPAN>By default on power-on reset the LVD system in enabled to reset the uP when the voltage drops below the lower LVD threshold (2.56v). On two occasions I have found that the system is being held in reset because the threshold has been changed to the upper level(4.4v) relevant for a 5v system. I have proved this by increasing the supply voltage to around 5v and the system starts, lower it back to 3.3 and the uP is held in reset without performing a POR.</SPAN><BR /><BR /><SPAN>I have not actively changed the LVWV bit in SPMSC2 to a "1". The bit changing to a "1" in a 3.3v system is fatal!</SPAN><BR /><BR /><SPAN>My I don't think my code is crashing and it is highly unlikely to be setting this bit, or is there a problem with the part itself.</SPAN><BR /><BR /><SPAN>I would prefer that the threshold selection bit was set in flash at programming time!</SPAN><BR /><BR /><SPAN>I look forward to your comments.</SPAN><BR /><BR /><SPAN>Regards</SPAN><BR /><SPAN>Phil Green</SPAN></BODY></HTML> Tue, 31 Oct 2006 18:09:06 GMT https://community.nxp.com/t5/8-bit-Microcontrollers/Problem-with-HCS08AW60-in-3-3v-system/m-p/134968#M3899 PhilG 2006-10-31T18:09:06Z Re: Problem with HCS08AW60 in 3.3v system https://community.nxp.com/t5/8-bit-Microcontrollers/Problem-with-HCS08AW60-in-3-3v-system/m-p/134969#M3900 <HTML><HEAD></HEAD><BODY>reference: mc9s08rd32dwe<BR /><BR />on the above processor we may be experiencing some die mis-functions in voltage detection. i have not looked into this other than deleting the lo voltage detection except during flash a flash write.</BODY></HTML> Tue, 07 Nov 2006 00:36:50 GMT https://community.nxp.com/t5/8-bit-Microcontrollers/Problem-with-HCS08AW60-in-3-3v-system/m-p/134969#M3900 jah 2006-11-07T00:36:50Z