PM_Opc_DIV

== DIV = Divide ==

Hex	Mnemonic	Cycles
CE D9	DIV HL, A	52

Execute

; 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.

Description

"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".

Conditions

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

Examples

; 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)

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