Hw6ECE - Lecture notes 6 PDF

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HW 6 ECE 362

Problem 6.1 Entry:

read:

equal: unequal:

Section cmpb beq ldaa cmpa bne ldab rts ldab rts

#0 equal 1,x+ 1,y+ unequal #$22 #$33

Problem 6.2 Entry: loop:

unequal:

Section ldd cmpd bne cmpd bne ldab rts ldab rts

1,x+ 1,y+ unequal #0 loop #$44 #$55

Problem 6.3 Variables: name1: name2:

Section dc.b dc.b

Entry:

Section ldx ldy jsr end

“Lisa”,0 “Mark”,0

#name1 #name2 loop

Problem 6.4 Variables: portS: portSDDR: LED

Section equ equ dc.b

Entry: check:

Section pshd pshy ldd addd dey bne puly edivs tfr bitb bne bset bclr bra bset bclr bita beq bset bra bclr movb puld rts

inc:

even:

odd: skip: negative: positive: skipagain:

$248 $24A 0

#0 2,x+ inc

y,d #1 odd LED, #1 LED, #0 skip LED, #0 LED, #1 #$80 positive LED, #$80 skipagain LED, #$80 LED, portS

Problem 6.5 Variables: portS: portSDDR: number: array:

Section equ equ equ dc.b

Entry:

Section movb ldx ldy bsr end

$248 $24A 5 1,2,3,4,5

#$FF,portSDDR #array #number check

Problem 6.6 Variables: name1: name2:

Section dc.b dc.b

Entry: compare:

Section pshd pshx pshy leas ldx ldy ldaa cmpa bne cmpa bne ldab bra ldab stab leas puly pulx puld rts

loop:

unequal: quit:

“Lisa”,0 “Mark”,0

6,sp 2,sp 4,sp 1,x+ 1,y+ unequal #0 loop #$66 quit #$77 -1,sp -6,sp

Problem 6.7 Variables: name1: name2:

Section dc.b dc.b

Entry:

Section ldx pshx ldx pshx bsr leas end

“Lisa”,0 “Mark”,0

#name1 #name2 compare +4,sp

Problem 6.8 Entry: stackpractice:

Section pshd leas bset bclr ldaa anda staa leas puld rts

-1,sp 4,sp,#%00100100 3,sp,#%01001000 4,sp 3,sp 0,sp +1,sp

Problem 6.9 Variables: number1: number2:

Section equ equ

Entry:

Section ldaa psha ldaa psha bsr ldaa leas

$43 $5A

number1 number2 stackpractice -3,sp +2,sp...