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)