Migration from F873 to F876, UTI03-Chip from Smartec

[Maximilian]

Hi,

at the moment we migrate a project from F873 to F876 mainly due to memory limitations. We use a UTI03 chip from Smartec in conjunction with the microcontroller. We also use parts of the Smartec code example to access the UTI chip (http://www.smartec.nl/software/Utikiteval.c).

We use the CCS compiler of version 2.049, MPLAB 7.40 and the Picstart+ programmer with the latest firmware.

After changing the #include statement from #include <16F873> to #include <16F876> the codes works somehow, but all calculations are completly wrong.

Is their any difference between the two types which the ccs compiler disregards?

One think we can imagine is, that the Smartec code (link to code see above) contains some inline assembler code, originally written for the F73, but works still fine with the F873. Maybe after changing to the F876 this could be the problem?

Greetings from Germany

Maximilian

[PCM programmer]

The compiler uses some of the PIC's RAM for its own scratch variables.
It could be that your ASM code uses some of that RAM.

My advice is to use printf statements to display some intermediate
results in your calculation code. Then you can find the line of code
which is causing the incorrect results.