MC68HC908 Introduction (2001)
EDFA sample code using 68HC11 (1997)
ADuC841 C Code Example - Link with Assembly Code
ADuC841 Assembly Code Example - Link with C Code
Visual Basic 3.0 Code to interface with C and ASM code above.
Orcad Schematic File
A Block Diagram, that is more clear, is in this file.
FIR and IIR assembly language program (main.asm) for Freescale MC56F84789VLL DSP (2014)
Sample coefficient file (dspfilter.asm) that works with main.asm for Freescale MC56F84789VLL DSP (2014)