MEK6802D5E evaluation system

This chapter describes the MEK6802D5E evaluation system, and it presents reference information to undertake the hands-on experience of 6800/6802 program execution and microprocessor system operation and development. The D5BUG monitor program requires 128 bytes of static RAM for the operating system, that is, memory locations E400 to E47F. This provides memory for storage of flag and data information and stack area for the monitor. However, 24 bytes are provided as a user-stack area. The chapter presents a summary of some useful D5BUG operating system RAM locations. The content of a memory location can be displayed or changed using the memory display /change editor. This is achieved by a keypad entry of the specified memory location address (leading zeros unnecessary), followed by pressing the M key. It results in the address and current data content being displayed. The memory address display can be incremented by one by a single pressing of the GO key, or it may be decremented by one by a single pressing of the M key. In all cases, the current memory content will be displayed for the accessed memory location. Therefore, a program may be entered and modified as required.