In SX Microcontrollers, SX/B Compiler and SX-Key Tool, robotworkshop wrote:

Hello,

It is a bit hard to read the schematic but I was wondering what you've done with the RTCC pin on the SX48 chip.  Did you leave it unconnected?  If so you should connect it to something or at least tie it high or low.

Can you try a different resonator?  I just ran into an odd problem this weekend while using one of my SX48 DIP modules and it ended up being a bad resonator.  Once I swapped it my program started working fine again.  I confirmed that the resonator was the problem by trying it on another module.  This is the first time i've ever run into a bad one but it is worth checking.  If you look at some of the schematics out there that use the SX48 w/resonator you may notice that some add a small ~ 5pf cap on one side of the resonator.  Depending upon how you laid out your board you may have to try adding a cap like this.  You should also try adding a small cap .1mf across the supply lines right at the SX48 chip.

Another thing that you would want to try is a 50Mhz oscilator instead of the resonator.  One important thing to note if you do this is make sure the oscilator is in a socket so you can remove it for programming!!  It can not be in the circuit like a resonator can.

Good Luck,

Robert

---------- End of Message ----------


You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=191612#m193405

Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com

The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2007 (http://www.dotNetBB.com)