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This is a basic framework for writing S12 assembler applications.
Features:

• Stacks
• Separate interrupt and subroutine stack
• Stacks are monitored forv over and underflows
• SCI
• Receive FIFO with meta data (error flags)
• Automatic baud rate detection
• Automatic signaling of transmission errors via LED
• Integer and string print routines
• LED
• Signals three states: idle, busy, transmission error