Question

Write an assembly code to do the following noting that the used microprocessor is MC68k:

The 7-Segment Display:

Use a 7-segment display and a set of current lining resistors (330 to 470 Ohm) in a common anode configuration with the output port of the VIA to display the value of the switch (For example, if the switch is set to [ON OFF OFF ON] then display9) The show goes like this: on power up, you have to show a count down from 9 to 0 at one Hertz rate, then display the value of the witch as it changes g f Com a b e d Com Dp

Answer 1

$MOD51
org 0000H
MAIN:
MOV p3, #080H
ACALL LABEL
MOV P3, #0B9H
ACALL LABEL
MOV P3, #034H
ACALL LABEL
MOV P3, #030H
ACALL LABEL
MOV P3, #019H
ACALL LABEL
MOV P3, #012H
ACALL LABEL
MOV P3, #003H
ACALL LABEL
MOV P3, #0B8H
ACALL LABEL
MOV P3, #000H
ACALL LABEL
MOV P3, #018H
SJMP MAIN
LABEL:MOV P1, #0C0H
ACALL DELAY
MOV P1, #0F9H
ACALL DELAY
MOV P1, #0A4H
ACALL DELAY
MOV P1, #0B0H
ACALL DELAY
MOV P1, #099H
ACALL DELAY
MOV P1, #092H
ACALL DELAY
MOV P1, #082H
ACALL DELAY
MOV P1, #0F8H
ACALL DELAY
MOV P1, #080H
ACALL DELAY
MOV P1, #090H
ACALL DELAY
RET


DELAY: MOV R0, #0FFH
LABEL1: MOV R1, #0FFH
LABEL2: MOV R2, #07H
LABEL3: DJNZ R2, LABEL3
DJNZ R1, LABEL2
DJNZ R0, LABEL1
RET;
END