Pokémon mini Development Documentation

ADD = Addition (16-bits)

Hex	Mnemonic	Cycles
C0 nn mm	ADD BA,#mmnn	3
C1 nn mm	ADD HL,#mmnn	3
C2 nn mm	ADD IX,#mmnn	3
C3 nn mm	ADD IY,#mmnn	3
CF 68 nn mm	ADD SP,#mmnn	4
CF 00	ADD BA,BA	4
CF 01	ADD BA,HL	4
CF 02	ADD BA,IX	4
CF 03	ADD BA,IY	4
CF 20	ADD HL,BA	4
CF 21	ADD HL,HL	4
CF 22	ADD HL,IX	4
CF 23	ADD HL,IY	4
CF 40	ADD IX,BA	4
CF 41	ADD IX,HL	4
CF 42	ADD IY,BA	4
CF 43	ADD IY,HL	4
CF 44	ADD SP,BA	4
CF 45	ADD SP,HL	4

Execute

#mmnn    = Immediate unsigned 16-bits
BA       = Register BA: (B shl 8) or A
HL       = Register HL: (H shl 8) or L
IX       = Register IX
IY       = Register IY
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 exceeds 16-bits signed range (< -32768 OR > 32767)
• Negative: Set when bit 15 of the result is 1

Examples

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

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

; IX = 0xBEEF
; BA = 0xDEAD
ADD BA, IX
; IX = 0xBEEF
; BA = 0x9D9C (0xDEAD + 0xBEEF = 0x(1)9D9C)
; SC = (Zero=0):(Carry=1):(Overflow=1):(Negative=0)

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