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Table B.8-7 11 Signed Multiplication/Division Instructions (Word, Long Word)
Mnemonic
#
DIV
A
2
DIV
A,ear
2
DIV
A,eam
2+
DIVW
A,ear
2
DIVW
A,eam
2+
MUL
A
2
MUL
A,ear
2
MUL
A,eam
2+
MULW
A
2
MULW
A,ear
2
MULW
A,eam
2+
*1: 3: Division by 0, 8 or 18: Overflow, 18: Normal
*2: 4: Division by 0, 11 or 22: Overflow, 23: Normal
*3: 5+(a): Division by 0, 12+(a) or 23+(a): Overflow, 24+(a): Normal
*4: When dividend is positive; 4: Division by 0, 12 or 30: Overflow, 31: Normal
When dividend is negative; 4: Division by 0, 12 or 31: Overflow, 32: Normal
*5: When dividend is positive; 5+(a): Division by 0, 12+(a) or 31+(a): Overflow, 32+(a): Normal
When dividend is negative; 5+(a): Division by 0, 12+(a) or 32+(a): Overflow, 33+(a): Normal
*6: (b): Division by 0 or overflow, 2 × (b): Normal
*7: (c): Division by 0 or overflow, 2 × (c): Normal
*8: 3: Byte (AH) is 0, 12: result is positive, 13: result is negative
*9: 4: Byte (ear) is 0, 13: result is positive, 14: result is negative
*10: 5+(a): Byte (eam) is 0, 14+(a): result is positive, 15+(a): result is negative
*11: 3: Word (AH) is 0, 16: result is positive, 19: result is negative
*12: 4: Word (ear) is 0, 17: result is positive, 20: result is negative
*13: 5+(a): Word (eam) is 0, 18+(a): result is positive, 21+(a): result is negative
Notes:
• The execution cycle count found when an overflow occurs in a DIV or DIVW instruction may be a
pre-operation count or a post-operation count depending on the detection timing.
• When an overflow occurs with DIV or DIVW instruction, the contents of the AL are destroyed.
• See Table B.5-1 and Table B.5-2 for information on (a) to (c) 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)
byte (AH) * byte (AL) → word (A)
*8
0
0
byte (A) * byte (ear) → word (A)
*9
1
0
byte (A) * byte (eam) → word (A)
*10
0
(b)
word (AH) * word (AL) → Long (A)
*11
0
0
word (A) * word (ear) → Long (A)
*12
1
0
word (A) * word (eam) → Long (A)
*13
0
(c)
Operation
LH
Z
Z
Z
-
-
-
-
-
-
-
-
APPENDIX B Instructions
AH
I
S
T
N
Z
V
C
-
-
-
-
-
-
*
-
-
-
-
-
-
*
-
-
-
-
-
-
*
-
-
-
-
-
-
*
-
-
-
-
-
-
*
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
RMW
*
-
*
-
*
-
*
-
*
-
-
-
-
-
-
-
-
-
-
-
-
-
665
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