Programme de validation du processeur CPU_8bits

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!"#$"%&&'(!L3M(2/"(0"#1'22'/"((3!4567,-2(
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Programme""assembleur"du"PGCD"(a,b)"
"
"
start":"
NOR"" " allone;"" " " Accu"="X"NOR"11111111="0"
NOR"" " b;" " " " Accu"="not (b)"
ADD"" " one";""""Accu"="not (b)"+"1="H"b"
ADD"" " a";""""Accu"="a"-"b"
JCC"" " neg;""""si"carry="0"alors"neg""sinon"carry=0"
STA"" " a;" " " " a=Accu;"
ADD"" " allone;"""Accu"="Accu"+”11111111”"d’où"carry"=1"sauf"si"a=0;"
JCC"" " end";" " " " si"carry="0"alors"end"sinon"carry=0"
""""""""""""JCC"" " start;""""carry=0"donc"start"
"
neg!:!
NOR" " "zero;"""""Accu"="Accu"NOR"00000000="not"(Accu)"
ADD"" " one;" " " " Accu"="Accu + 1"
STA"" " b;" " " " b=Accu"
JCC" " start;"""""si"carry="0"alors"start!sinon"carry=0"
"
end!:!
JCC"" " end!;&&&&carry=0"donc"end!"(le"résultat"est"en"b)"
"
"

Exemple"d’application""du"programme"PGCD"(a,b)"pour"a"=40"""et"b=24"
"
Premier"exécution":"(a"=40"et"b=24)"
Accu"="0"
Accu"=NOT(24)"
Accu="NOT(24)"+1"="H24"
Accu"="40H24="16"(carry=1)"
JCC"(carry=0)(
a=16"
Accu="16"+FF=0"(carry=1)"
JCC"(carry=0)(
JCC"start!
"
Deuxième"exécution":"(a"=16"et"b=24)"
Accu"="0"
Accu"=NOT(24)"
Accu="NOT(24)"+1"="H24"
Accu"="16H24="H8"(carry=0)"
JCC"neg!
(
"Accu="NOT(H8)"
"Accu="NOT(H8)"+1"="8"
b=8"
JCC"start!
"
"
Troisième"exécution":"(a"=16"et"b=8)"
Accu"="0"
Accu"=NOT(8)"
Accu="NOT(8)"+1"="H8"
Accu"="16H8="8"(carry=1)"
JCC"(carry=0)(
a=8"
Accu="8"+FF=0"(carry=1)"
JCC"(carry=0)(
JCC"start!
"
Quatrième"exécution":"(a"=8"et"b=8)"
Accu"="0"
Accu"=NOT(8)"
Accu="NOT(8)"+1"="H8"
Accu"="8H8="0"(carry=1)"
JCC"(carry=0)(
a=0"
Accu="0"+FF=FF"(carry=0)"
JCC"end!
JCC"end!
!
"Le"résultat"est"b=8"
"

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Adresse&
Mem&en&&
hexa&
Instruction&en&
décimal&
Interprétation&
Mem&en&&hex&
après&exécution&
Mem&en&&binaire&
après&exécution&
00"
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