The 8051 microcontroller is a good general purpose controller for small single chip applications, however it is difficult to develop code for the single-chip configuration because you can only run code from the internal ROM in this case. A "normal" development environment requires you to put the chip into external bus mode, which forfeits more than 1/2 of the I/O pins and several I/O ports.
This device uses a Dallas DS2250 microprocessor which is a member of the 8051 family that has on-board battery backed up RAM, and programmable control of the mapping of that RAM between the 8051s CODE and DATA address spaces. With a small resident kernal, you can download code to this device and perform debug functions such as single-stepping, breakpoints, examine and modify memory all without sacrificing the I/O facilities normally available only in single chip mode.
Software for this device provides for three methods of debugging:
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