PM Opc SUB16

SUB = Subtraction (16-Bits)

Hex	Mnemonic	Cycles
D0 nn nn	SUB BA, #nnnn	12
D1 nn nn	SUB HL, #nnnn	12
D2 nn nn	SUB X, #nnnn	12
D3 nn nn	SUB Y, #nnnn	12
CF 6A nn nn	SUB SP, #nnnn	16
CF 08	SUB BA, BA	16
CF 09	SUB BA, HL	16
CF 0A	SUB BA, X	16
CF 0B	SUB BA, Y	16
CF 28	SUB HL, BA	16
CF 29	SUB HL, HL	16
CF 2A	SUB HL, X	16
CF 2B	SUB HL, Y	16
CF 48	SUB X, BA	16
CF 49	SUB X, HL	16
CF 4A	SUB Y, BA	16
CF 4B	SUB Y, HL	16
CF 4C	SUB SP, BA	16
CF 4D	SUB SP, HL	16

Execute

#nnnn    = Immediate unsigned 16-Bits
BA       = Register BA: (B shl 8) or A
HL       = Register HL: (H shl 8) or L
X        = Register X
Y        = Register Y
SP       = Register SP (Stack Pointer)

; SUB Ds, Sc
;
; Ds = Destination
; Sc = Source

Ds = Ds - Sc

Description

16-Bits Source subtracts to the 16-Bits Destination.

Conditions

Zero: Set when result is 0

Carry: Set when result is < 0

Overflow: Set when result overflow 16-bits signed range (< -32768 OR > 32767)

Sign: Set when bit 15 of the result is 1

Examples

; BA = 0x2EF0
SUB BA, $1337
; BA = 0x1BB9 (0x2EF0 - 0x1337 = 0x(0)1BB9)
; F = (Zero=0):(Carry=0):(Overflow=0):(Sign=0)

; HL = 0xBB7E
; BA = 0xCF12
SUB BA, HL
; HL = 0xBB7E
; BA = 0xEC6C (0xCF12 - 0xBB7E = 0x(1)EC6C)
; F = (Zero=0):(Carry=1):(Overflow=0):(Sign=1)

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