RS08

C6808

RS08 has no Negative bit in its condition codes. Can you do signed math operations?

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Yes.

C6808

RS08 has no stack: how can you perform nested function calls?

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C6808 creates a stack through program code: it preserves the Shadow PC (SPC) in a local variable and restores it prior to returning.
As an optimization, it eliminates this code whenever possible. When a function calls no subordinate functions, or when the call to a subordinate function happens at specific points in program flow, the compiler eliminates the saved PC and the memory location it would require.

This approach uses no extra memory compared to a hardware stack.

C6808

Do I really need C to program RS08?

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There's no reason not to use C to program even the smallest computers. C compilers improve on assemblers by:

  • Allowing the developer to work in the problem space (choosing the symbolic operations), not the solution space (choosing the machine instructions).
  • Calculating opportunities for optimization with both the algorithm and target hardware in mind.
C6808

When is a branch not a branch?

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I recently got an interesting code sequence out of the compiler.

FAE

C versus Assembly

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This article describes a test we perform on our Code Development System compilers to test code generation. As a side benefit, it proves that C can match assembly, and beat it, even unexpectedly...

C6808

C6808 C Compiler for Freescale HC08/HCS08/RS08

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The C6808 Code Development System supports all Freescale HC08, HCS08, and RS08 microcontrollers.

C6808 Resources

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Byte Craft's C6808 Code Development System is designed for the Freescale M68HC08 family of microcontrollers.

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