== DIV = Divide ==
| Hex | Mnemonic | Cycles |
|---|---|---|
| CE D9 | DIV HL, A | 52 |
; DIV HL, A
;
; HL is the Dividend
; A is the Divisor
; L will be the Quotient
; H will be the Remainder/Rest
Ds = HL ÷ A
IF Ds < 256 THEN
L = Ds ; Quotient
H = HL % A ; Remainder
ENDIF
Note:
Can throw Division by Zero if Divisor is 0 (We need to research more about this).
If Quotient can't fit in 8-Bits range, Overflow flag will be set and the result won't be saved.
"16-Bits Register HL" divide by "8-Bits Register A", Quotient will be stored at "8-Bits Register L" and Remainder will be stored at "8-Bits Register H".
Zero: Set when result is 0
Carry: Always Clear
Overflow: Set when Quotient can't fit in 8-Bits range
Sign: Set when bit 7 of Quotient is 1
; A = 0x02
; HL = 0x0007
DIV`` ``HL,`` ``A
; L = 0x03 (0x0007 / 0x02 = 0x03 (with rest 0x01))
; H = 0x01 (Remainder/Rest)
; F = (Zero=0):(Carry=0):(Overflow=0):(Sign=0)
; A = 0x00
; HL = 0x0007
DIV`` ``HL,`` ``A
; (0x0007 / 0x00 = Division by Zero)
; HL = 0x???? (Unpredictable result!?)
; F = (Zero=?):(Carry=?):(Overflow=?):(Sign=?)
; - Throw Division by Zero Exception
; A = 0x02
; HL = 0xFFFD
DIV`` ``HL,`` ``A
; (0xFFFD / 0x02 = 0x7FFE (with rest 0x01))
; HL = 0xFFFD (Results are unchanged since Quotient exceed 8-Bits range)
; F = (Zero=0):(Carry=0):(Overflow=1):(Sign=1)