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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