Abstract
A number of microcomputer and microcontroller applications have small production runs or require quick prototyping to allow for concurrent development of other parts of the system which depend on functional, if not final, code. In these cases, the ease, speed, and reduced errors associated with coding the operating program in a high-level language justify its usage. The reduction in non-recurring engineering costs more than compensates for the increased recurring product costs and therefore makes sense from a total cost perspective. A model of the software design cycle is introduced here which considers software development as starting at the highest language level possible and only those sections of code which require streamlining for reasons of increased execution speed or reduced program storage being re-coded into assembly language. Examples are given of how to use the C language to directly address hardware components and memory and how to effectively link assembly language and C into a single functional program.
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