SBC = Subtract with Carry (16-Bits)

Hex Mnemonic Cycles
CF 0C SBC BA, BA 16
CF 0D SBC BA, HL 16
CF 0E SBC BA, X 16
CF 0F SBC BA, Y 16
CF 2C SBC HL, BA 16
CF 2D SBC HL, HL 16
CF 2E SBC HL, X 16
CF 2F SBC HL, Y 16
CF 62 nn nn SBC BA, #nnnn 16
CF 63 nn nn SBC HL, #nnnn 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
    
; SBC Ds, Sc
;
; Ds = Destination
; Sc = Source

Ds = Ds - Sc - Carry
    

Description

16-Bits Source and Carry 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
; F = (Carry=1)
SBC BA, $1337
; BA = 0x1BB8 (0x2EF0 - 0x1337 - 0x0001 = 0x(0)1BB8)
; F = (Zero=0):(Carry=0):(Overflow=0):(Sign=0)
    
; HL = 0xBB7E
; BA = 0xCF12
; F = (Carry=0)
SBC BA, HL
; HL = 0xBB7E
; BA = 0xEC6C (0xCF12 - 0xBB7E - 0x0000 = 0x(1)EC6C)
; F = (Zero=0):(Carry=1):(Overflow=0):(Sign=1)
    

« Back to Instruction set