I have a program written in ARM assembly language, the task is to display a character on TeraTerm terminal. I have tried to run the program using different version of Keil microvision MDK522, MDK521a and MDK513 but it did not work with any of them. my code is correct because when I have tested it with a PC at laboratory, it worked fine. I am using Teraterm version 4.93. I am using FRDM-KL25Z evaluation board and the debugger is PEMicro Debugger.