## ADD = Addition (16-Bits)

Hex | Mnemonic | Cycles
--- | --- | ---
C0 nn nn | ADD BA, #nnnn | 12
C1 nn nn | ADD HL, #nnnn | 12
C2 nn nn | ADD X, #nnnn | 12
C3 nn nn | ADD Y, #nnnn | 12
CF 68 nn nn | ADD SP, #nnnn | 16
CF 00 | ADD BA, BA | 16
CF 01 | ADD BA, HL | 16
CF 02 | ADD BA, X | 16
CF 03 | ADD BA, Y | 16
CF 20 | ADD HL, BA | 16
CF 21 | ADD HL, HL | 16
CF 22 | ADD HL, X | 16
CF 23 | ADD HL, Y | 16
CF 40 | ADD X, BA | 16
CF 41 | ADD X, HL | 16
CF 42 | ADD Y, BA | 16
CF 43 | ADD Y, HL | 16
CF 44 | ADD SP, BA | 16
CF 45 | ADD 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)

    ; ADD Ds, Sc
    ;
    ; Ds = Destination
    ; Sc = Source

    Ds = Ds + Sc

### Description

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

### Conditions

Zero: Set when result is 0

Carry: Set when result is >= 65536

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

Sign: Set when bit 15 of the result is 1

### Examples

    ; BA = 0x0EF0
    ADD BA, $1337
    ; BA = 0x2227 (0x0EF0 + 0x1337 = 0x(0)2227)
    ; F = (Zero=0):(Carry=0):(Overflow=0):(Sign=0)

    ; HL = 0xBB7E
    ; BA = 0xCF12
    ADD BA, HL
    ; HL = 0xBB7E
    ; BA = 0x8A90 (0xCF12 + 0xBB7E = 0x(1)8A90)
    ; F = (Zero=0):(Carry=1):(Overflow=0):(Sign=1)

    ; X = 0xBEEF
    ; BA = 0xDEAD
    ADD BA, X
    ; X = 0xBEEF
    ; BA = 0x9D9C (0xDEAD + 0xBEEF = 0x(1)9D9C)
    ; F = (Zero=0):(Carry=1):(Overflow=1):(Sign=0)

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