Average values in 68000 assembly

Average Values in 68000 Assembly

Write an MC68000 assembly language program that computes the average of fifteen data
bytes in memory
• Your program should expect to find the data bytes stored at memory locations$600 thru $60E. All values are positive and their sum may require more than 8bits.
• Your program should store the result as follows:
o Integral part of average at Byte $760
o Fractional part x 10 (the remainder after division) at Byte $761
• Start your executable instructions at $800
• Your executable instructions should not use numbers to specify any addresses.
Instead,
o Use ORG directives to set the location counter to the proper place,
o Use DS.B directives to define names for the data bytes, and
oSpecify the data address by name in the instructions.

Example: ORG $600
DATA1 DS.B 1
DATA2 DS.B 1
..
ORG $800
..
MOVE.B DATA1, D0
• End your program with TRAP #15 (D0 set to 9) and END
• Include global and local comments
• Run the program several times with different data. Be sure to set the PC for $800,
not $600

Solution

program.X68

*———————————————————–

* Title :

* Written by :

* Date :

* Description:

*———————————————————–

ORG $600

DATA1 DS.B 1

DATA2 DS.B 1

DATA3 DS.B 1

DATA4 DS.B 1

DATA5 DS.B 1

DATA6 DS.B 1

DATA7 DS.B 1

DATA8 DS.B 1

DATA9 DS.B 1

DATA10 DS.B 1

DATA11 DS.B 1

DATA12 DS.B 1

DATA13 DS.B 1

DATA14 DS.B 1

DATA15 DS.B 1

ORG $760

INTEG DS.B 1

FRACT DS.B 1

ORG $800

MOVE.L #0,D1 ; D1 will contain the sum, initialize to zero

MOVE.B DATA1, D0 ; load value from array into D0