When my code is compiled, it causes XDATA memory above 100HEX to be addressed with MOVX @R0,A rather than MOVX @DPTR,A instructions. This causes variables in the XDATA range 0 - 100HEX to be overwritten. I do not have this problem with XDATA above C000HEX, and am not sure how far above 100HEX this problem exists. Any solutions would be appreciated. Thank you, Frank Way
Please inlcude a short segment of C code that demonstrates the problem. Note any compiler flags you use too. XDATA can be accessed with R0 as a page pointer by setting up Port 2 and then using R0 to control Port 0 (the LSB). Are you using pdata anywhere? - Mark