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Hello, I am using the MC68HC11E1CFU3 64 pin quad flat pack. I have a question concerning the correct orientation of the part. It is somewhat confusing since there are two indented circles on the part and the datasheet only shows one. I am assuming pin 1 is where the larger circle is located. Also, the datasheet shows a slight nip on the part where pin 1 is located but physically looking at it this is ever so slight. The boards were assembled by an assembly house and all five boards have the part in what appears to be backwards. I am testing some prototype boards and microcontroller gets very hot to the touch and of course doesn't work. This is a repackage of a previous design which worked great. I am also wondering since the part is orientate 180 degrees out of phase would this cause the crystal to stop working? If someone can confirm the correct orientation of the part and whether the crystal is effected by having the part in backwards I would appreciate it. Thanks in advance.

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Comment/question below. Emmett Redd Ph.D. mailto: Associate Professor (417)836-5221 Department of Physics, Astronomy, and Material Science Southwest Missouri State University Fax (417)836-6226 901 SOUTH NATIONAL Dept (417)836-5131 SPRINGFIELD, MO 65804 USA > -----Original Message----- > From: coolpix404 <> [mailto:] > Sent: Wednesday, January 15, 2003 10:49 AM > To: > Subject: [m68HC11] Orientation for MC68HC11E1CFU3 QFP > > Hello, > > I am using the MC68HC11E1CFU3 64 pin quad flat pack. I have a > question concerning the correct orientation of the part. It is > somewhat confusing since there are two indented circles on the part > and the datasheet only shows one. I am assuming pin 1 is where the > larger circle is located. Also, the datasheet shows a slight nip on > the part where pin 1 is located but physically looking at it this is > ever so slight. The boards were assembled by an assembly house and > all five boards have the part in what appears to be backwards. > > I am testing some prototype boards and microcontroller gets very hot > to the touch and of course doesn't work. This is a repackage of a > previous design which worked great. I am also wondering since the > part is orientate 180 degrees out of phase would this cause the > crystal to stop working? Unless there is the appropriate inverter at the 180 degree out-of-phase location, why would you expect the crystal to work? If someone can confirm the correct > orientation of the part and whether the crystal is effected by having > the part in backwards I would appreciate it. Thanks in advance. > ------------------------ Yahoo! Groups Sponsor > > To unsubscribe from this group, send an email to:

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Give him hell Professor! >From: "Redd, Emmett R" <> >Reply-To: >To: <> >Subject: RE: [m68HC11] Orientation for MC68HC11E1CFU3 QFP >Date: Wed, 15 Jan 2003 13:49:39 -0600 > >Comment/question below. > >Emmett Redd Ph.D. mailto: >Associate Professor (417)836-5221 >Department of Physics, Astronomy, and Material Science >Southwest Missouri State University Fax (417)836-6226 >901 SOUTH NATIONAL Dept (417)836-5131 >SPRINGFIELD, MO 65804 USA > > > -----Original Message----- > > From: coolpix404 <> [mailto:] > > Sent: Wednesday, January 15, 2003 10:49 AM > > To: > > Subject: [m68HC11] Orientation for MC68HC11E1CFU3 QFP > > > > Hello, > > > > I am using the MC68HC11E1CFU3 64 pin quad flat pack. I have a > > question concerning the correct orientation of the part. It is > > somewhat confusing since there are two indented circles on the part > > and the datasheet only shows one. I am assuming pin 1 is where the > > larger circle is located. Also, the datasheet shows a slight nip on > > the part where pin 1 is located but physically looking at it this is > > ever so slight. The boards were assembled by an assembly house and > > all five boards have the part in what appears to be backwards. > > > > I am testing some prototype boards and microcontroller gets very hot > > to the touch and of course doesn't work. This is a repackage of a > > previous design which worked great. I am also wondering since the > > part is orientate 180 degrees out of phase would this cause the > > crystal to stop working? > >Unless there is the appropriate inverter at the 180 degree out-of-phase >location, why would you expect the crystal to work? > >If someone can confirm the correct > > orientation of the part and whether the crystal is effected by having > > the part in backwards I would appreciate it. Thanks in advance. > > > > > > ------------------------ Yahoo! Groups Sponsor > > > > To unsubscribe from this group, send an email to: > > > > > > > > > > > _________________________________________________________________ STOP MORE SPAM with the new MSN 8 and get 2 months FREE* http://join.msn.com/?page=features/junkmail

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I really wasn't wanting to give him hell. But the question I proposed is Socratic and was intended to illustrate troubleshooting technique and logic. Converse to the question would be the statement, "If the oscillator is working and there is not an inverter on the opposite side, then the part is oriented correctly." But the reverse is not true; a non-working oscillator does not mean the part orientation is wrong. There could be many causes of a non-working oscillator including loading it with the oscilloscope. Please cut coolpix some slack. He may have been in a panic and just dashed off the question without really thinking. I have been in such a panic too many times this past year with my product development. If this is coolpix's problem, I hope my question helped take his mind out of panic mode and into more of a reflective/logic mode. Emmett Redd Ph.D. mailto: Associate Professor (417)836-5221 Department of Physics, Astronomy, and Material Science Southwest Missouri State University Fax (417)836-6226 901 SOUTH NATIONAL Dept (417)836-5131 SPRINGFIELD, MO 65804 USA > -----Original Message----- > From: Jim Madison [mailto:] > Sent: Thursday, January 16, 2003 5:56 PM > To: > Subject: RE: [m68HC11] Orientation for MC68HC11E1CFU3 QFP > > Give him hell Professor! > >From: "Redd, Emmett R" <> > >Reply-To: > >To: <> > >Subject: RE: [m68HC11] Orientation for MC68HC11E1CFU3 QFP > >Date: Wed, 15 Jan 2003 13:49:39 -0600 > > > >Comment/question below. > > > >Emmett Redd Ph.D. mailto: > >Associate Professor (417)836-5221 > >Department of Physics, Astronomy, and Material Science > >Southwest Missouri State University Fax (417)836-6226 > >901 SOUTH NATIONAL Dept (417)836-5131 > >SPRINGFIELD, MO 65804 USA > > > > > -----Original Message----- > > > From: coolpix404 <> [mailto:] > > > Sent: Wednesday, January 15, 2003 10:49 AM > > > To: > > > Subject: [m68HC11] Orientation for MC68HC11E1CFU3 QFP > > > > > > Hello, > > > > > > I am using the MC68HC11E1CFU3 64 pin quad flat pack. I have a > > > question concerning the correct orientation of the part. It is > > > somewhat confusing since there are two indented circles on the part > > > and the datasheet only shows one. I am assuming pin 1 is where the > > > larger circle is located. Also, the datasheet shows a slight nip on > > > the part where pin 1 is located but physically looking at it this is > > > ever so slight. The boards were assembled by an assembly house and > > > all five boards have the part in what appears to be backwards. > > > > > > I am testing some prototype boards and microcontroller gets very hot > > > to the touch and of course doesn't work. This is a repackage of a > > > previous design which worked great. I am also wondering since the > > > part is orientate 180 degrees out of phase would this cause the > > > crystal to stop working? > > > >Unless there is the appropriate inverter at the 180 degree out-of-phase > >location, why would you expect the crystal to work? > > > >If someone can confirm the correct > > > orientation of the part and whether the crystal is effected by having > > > the part in backwards I would appreciate it. Thanks in advance. > > > > > > > > > ------------------------ Yahoo! Groups Sponsor > > > > > > To unsubscribe from this group, send an email to: > > > > > > > > > > > > > > > > > > > > _________________________________________________________________ > STOP MORE SPAM with the new MSN 8 and get 2 months FREE* > http://join.msn.com/?page=features/junkmail > ------------------------ Yahoo! Groups Sponsor > > To unsubscribe from this group, send an email to:

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