i am trying to use code memory space to store some constants patterns. to do this, i have defined an array in code memory space as follows: unsigned char code A[]={0x00,0x3F,0x50,0x90,0x50,0x3F,0xAA}; it doesn't work at all or sometimes i get unpredicted results. but when i define the array in data memory and initialize the array as follows. can anyone help me? thanks A[1] = 0x00; A[2] = 0x3F; . A[6] = 0xAA
"i haven't tried it on simulator, instead i am trying this code directly on hardware each time i proramme it" And you say it's driving you crazy - so don't do it! Unless you have a chip with on-chip debug - in which case, use it! IF you can reproduce the problem in the simulator, it will be much easier to debug; if you can't, it most likely means that you have a hardware fault, misconfiguration, or your interfacing is bad. "you have any suggestion?" I'm still waiting for your response to my previous questions & suggestion: Have you looked in the map file & verified that the code constants are being placed in a sensible location? Are you getting any errors or warnings during the build? Post the smallest complete program that illustrates the problem.