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Table A.8-6 11 Unsigned multiplication/division instructions (word, long word)
Mnemonic
DIVU
A
1
DIVU
A,ear
2
DIVU
A,eam
2+
DIVUW
A,ear
2
DIVUW
A,eam
2+
MULL
A
1
MULL
A,ear
2
MULL
A,eam
2+
MULEY
A
1
MULEY
A,ear
2
MULEY
A,eam
2+
*1: 3: Division by 0 7: Overflow 15: Normal
*2: 4: Division by 0 8: Overflow 16: Normal
*3: 6+(a): Division by 0 9+(a): Overflow 19+(a): Normal
*4: 4: Division by 0 7: Overflow 22: Normal
*5: 6+(a): Division by 0 8+(a): Overflow 26+(a): Normal
*6: (b): Division by 0 or overflow 2 x (b): Normal
*7: (c): Division by 0 or overflow 2 x (c): Normal
*8: 3: Byte (AH) is 0. 7: Byte (AH) is not 0.
*9: 4: Byte (ear) is 0. 8: Byte (ear) is not 0.
*10: 5+(a): Byte (eam) is 0, 9+(a): Byte (eam) is not 0.
*11: 3: Word (AH) is 0. 11: Word (AH) is not 0.
*12: 4: Word (ear) is 0. 12: Word (ear) is not 0.
*13: 5+(a): Word (eam) is 0. 13+(a): Word (eam) is not 0.
Note:
See Table A.5-1 "Execution cycle counts in each addressing mode" and Table A.5-2 "Cycle count
correction values for counting execution cycles" for information on (a) to (d) in the table.
#
RG
B
*1
0
0
word (AH) / byte (AL)
quotient --> byte (AL) remainder --> byte (AH)
*2
1
0
word (A) / byte (ear)
quotient --> byte (A) remainder --> byte (ear)
*3
0
*6
word (A) / byte (eam)
quotient --> byte (A) remainder --> byte (eam)
*4
1
0
long (A) / word (ear)
quotient --> word (A) remainder --> word (ear)
*5
0
*7
long (A) / word (eam)
quotient --> word (A) remainder --> word (eam)
*8
0
0
byte (AH) * byte (AL) --> word (A)
*9
1
0
byte (A) * byte (ear) --> word (A)
*10
0
(b)
byte (A) * byte (eam) --> word (A)
*11
0
0
word (AH) * word (AL) --> Long (A)
*12
1
0
word (A) * word (ear) --> Long (A)
*13
0
(c)
word (A) * word (eam) --> Long (A)
Operation
L
H
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APPENDIX A Instructions
A
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N
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R
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645
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