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DIV
DIVIDE
DIV
Operation:
(temp) - (NUMR)
if (temp)
I (DIVR) > MAX then the
following, in
sequence
(QUO), (REM) undefined
(SP) - (SP) - 2
((SP) + 1 :(SP)) - FLAGS
(IF) - 0
(TF)
-0
(SP) - (SP) - 2
((SP) + 1 :(SP)) - (CS)
(CS) -
(2)
i.e.,
the
contents
of
memory
locations 2 and 3
(SP) - (SP) - 2
((SP) + 1 :(SP)) - (IP)
(IP) -
(0)
i.e., the
contents
of
locations 0 and 1
else
(QUO) -
(temp) I (DIVR), where
I is
unsigned
division
(REM)
- (temp) % (DIVR) where
% is
unsigned
modulo
Description:
DIV
source
DIV (divide) performs an unsigned division
of
the accumulator (and its extension) by the
source operand.
If
the source operand is a
byte, it is divided into the two-byte dividend
assumed to be in registers AL and AH. The
byte quotient is returned in AL, and the byte
remainder is returned in AH.
If
the source
operand is a word, it is divided into the two-
word dividend in registers
AX
and DX. The
word quotient is returned in AX, and the word
2-73
Flags Affected:
AF, CF, OF,
PF,
SF,
ZF
undefined
remainder is returned in DX.
If
the quotient
exceeds the capacity
of
its destination register
(FFH
for
byte
source,
FFFFH
for
word
source); as when division by zero is attempted,
a
type
0
interrupt
is
generated,
and
the
quotient and remainder are undefined. Nonin-
tegral quotients are truncated to integers. The
content
of
AF, CF, OF, PF, SF and
ZF
is un-
defined following execution of
DIV.