Pokémon mini Development Documentation

SBC = Subtract with Carry (16-bits)

Hex	Mnemonic	Cycles
CF 0C	SBC BA,BA	4
CF 0D	SBC BA,HL	4
CF 0E	SBC BA,IX	4
CF 0F	SBC BA,IY	4
CF 2C	SBC HL,BA	4
CF 2D	SBC HL,HL	4
CF 2E	SBC HL,IX	4
CF 2F	SBC HL,IY	4
CF 62 nn mm	SBC BA,#mmnn	4
CF 63 nn mm	SBC HL,#mmnn	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

; SBC Ds, Sc
;
; Ds = Destination
; Sc = Source

Ds = Ds - Sc - Carry

Description

Subtracts 16-bits Source and Carry from 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
; SC = (Carry=1)
SBC BA, $1337
; BA = 0x1BB8 (0x2EF0 - 0x1337 - 0x0001 = 0x(0)1BB8)
; SC = (Zero=0):(Carry=0):(Overflow=0):(Negative=0)

; HL = 0xBB7E
; BA = 0xCF12
; SC = (Carry=0)
SBC BA, HL
; HL = 0xBB7E
; BA = 0xEC6C (0xCF12 - 0xBB7E - 0x0000 = 0x(1)EC6C)
; SC = (Zero=0):(Carry=1):(Overflow=0):(Negative=1)

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