Pokémon mini Development Documentation

SUB = Subtraction (16-bits)

Hex	Mnemonic	Cycles
D0 nn mm	SUB BA,#mmnn	3
D1 nn mm	SUB HL,#mmnn	3
D2 nn mm	SUB IX,#mmnn	3
D3 nn mm	SUB IY,#mmnn	3
CF 6A nn mm	SUB SP,#mmnn	4
CF 08	SUB BA,BA	4
CF 09	SUB BA,HL	4
CF 0A	SUB BA,IX	4
CF 0B	SUB BA,IY	4
CF 28	SUB HL,BA	4
CF 29	SUB HL,HL	4
CF 2A	SUB HL,IX	4
CF 2B	SUB HL,IY	4
CF 48	SUB IX,BA	4
CF 49	SUB IX,HL	4
CF 4A	SUB IY,BA	4
CF 4B	SUB IY,HL	4
CF 4C	SUB SP,BA	4
CF 4D	SUB SP,HL	4

Execute

hhll    = 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)

; 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 exceeds 16-bits signed range (< -32768 OR > 32767)
• Negative: Set when bit 15 of the result is 1

Examples

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

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

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