Hi, I've the same problem as Dan Kneipp with Cygnal device - source above address 0x8000 is not mapped when running debugger (only ASM is shown). The difference is the code IS NOT BANKED and has constants in range 0x0000-0x8400 and code above till 0xA000. C51 v7.03 A51 v7.03 BL51 v5.02 CYGNAL uVision driver v.1.33