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APPENDIX B Instructions
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 (d) in the table.
Table B.8-7 11 Signed Multiplication/division Instructions (word, long word)
Mnemonic # RG B Operation L
H
A
H
ISTNZVCR
M
W
DIV A 2 *1 0 0
word (AH) / byte (AL)
quotient --> byte (AL) remainder --> byte (AH)
Z------**-
DIV A,ear 2 *2 1 0
word (A) / byte (ear)
quotient --> byte (A) remainder --> byte (ear)
Z------**-
DIV A,eam 2+ *3 0 *6
word (A) / byte (eam)
quotient --> byte (A) remainder --> byte (eam)
Z------**-
DIVW A,ear 2 *4 1 0
long (A) / word (ear)
quotient --> word (A) remainder --> word (ear)
-------**-
DIVW A,eam 2+ *5 0 *7
long (A) / word (eam)
quotient --> word (A) remainder --> word (eam)
-------**-
MUL A 2 *8 0 0 byte (AH) * byte (AL) --> word (A) ----------
MUL A,ear 2 *9 1 0 byte (A) * byte (ear) --> word (A) ----------
MUL A,eam 2+ *10 0 (b) byte (A) * byte (eam) --> word (A) ----------
MULW A 2 *11 0 0 word (AH) * word (AL) --> Long (A) ----------
MULW A,ear 2 *12 1 0 word (A) * word (ear) --> Long (A) ----------
MULW A,eam 2+ *13 0 (c) word (A) * word (eam) --> Long (A) ----------
*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 x (b): Normal
*7: (c): Division by 0 or overflow, 2 x (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