The canonical 8051 has a
Harvard Architecture (separate address spaces for data and instructions) plus a third address space for internal RAM and special function registers. Standard C presupposes a
von Neumann Architecture (a single address space for everything). Thus, C compilers for 8051 processors typically have nonstandard extensions to bridge the gap. A specific and detailed answer to your question cannot be given without knowing the particular extensions used by your compiler.
Here are some questions about your embedded system. General answers are ok to begin with, no need yet for detailed code snippets.
- How is the LED turned on?
- How is the LED turned off?
- How is elapsed time measured?
- Is it acceptable to write a function that turns on the LEDs, waits for 2 seconds, and then turns off the LED? That is, is it acceptable that your embedded system doesn't do anything else while this function runs for 2 seconds?
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