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Need help writing a program  to generate a square signal for MC68HC11 processor

Asked by bg18461a in Assembly Programming Language, Processor Programming for Specific Platforms

Tags: assembly, MC68HC11

I need help to write a program (assembly language) that generates a square signal with a frequency previously established. I am using the FOX11 kit and I want to use the parallel ports on that kit.
I would like it to take the input from a 4x4 keypad.  The numbers entered will be over 500 to represent the frequency generated.
Any help?
 
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20091021-EE-VQP-81 - Hierarchy / EE_QW_3_20080625