Posted on May 17, 2011 at 11:36I have an application that uses the ST90R158 operates correctly about 90% of the time.
The only part of memory that is remapped is the internal ram, which is selected in DPR1 and is used for the stack and some initialized data. DPR0, DPR2, and DPR3 all point to the areas of memory within the normal 64K that would be addressed if the MMU didn't exist.
However, under some circumstances (usually during an increase in temperature) the unit changes it's accesses to the actual physical memory the program indicates, instead of the mapped memory. Since there is no ram there, the application fails. The program is still running, but it tend to fall into a loop where it's trying to increment values and can't.
Is there any way that the MMU can be disabled? I was under the impression that the MMU operated all of the time, but this is obviously not what's happening.
