Lab 8

Week of November 15

Procedure calls in HC11

1.  Write a LCDINT routine to print a 16-bit unsigned integer (presumably
    passed in the D register) to the LCD display in decimal, character
    by character.  Write a well-structured HC11 procedure, saving all
    registers that you use at the start of the procedure, and
    restoring them at the end.  Make sure that the characters come out
    the LCD display in the correct order.

    It may be a good idea to not use loops, and just repeat the code
    the appropriate number of times, as long as you do not print out
    any leading zeros.

    Test your code reading D from the switches.


2.  Debug the fibonocci program shown in class (there were several
    errors, some discussed in class).  

    Modify the code to take an 8-bit input from the switches and
    create a 16-bit fibonocci number.

    Output the input number and the answer to the LCD display,
    for example as 'F(7)=13'

3.  Submit (5 pm Friday, November 19):

    readme    Clear discussion of your HC11 procedure calling
	      convention

    fib.asm


For a +:
    Checkoff and submission on your Monday or Tuesday lab session. 
    And excellent readme.    

    or

    Write a recursive HC11 routine to sum the squares of the input
    value down to 1, and print out on the display, for example,
    'F(7)=13 and SQ(7)=140'.  Again, use an 8-bit input but do 16-bit
    calculations.