SUB = Subtraction (16-Bits)
| Hex | Mnemonic | Cycles |
|---|---|---|
| D0 nn nn | SUB BA, #nnnn | 12 |
| D1 nn nn | SUB HL, #nnnn | 12 |
| D2 nn nn | SUB X, #nnnn | 12 |
| D3 nn nn | SUB Y, #nnnn | 12 |
| CF 6A nn nn | SUB SP, #nnnn | 16 |
| CF 08 | SUB BA, BA | 16 |
| CF 09 | SUB BA, HL | 16 |
| CF 0A | SUB BA, X | 16 |
| CF 0B | SUB BA, Y | 16 |
| CF 28 | SUB HL, BA | 16 |
| CF 29 | SUB HL, HL | 16 |
| CF 2A | SUB HL, X | 16 |
| CF 2B | SUB HL, Y | 16 |
| CF 48 | SUB X, BA | 16 |
| CF 49 | SUB X, HL | 16 |
| CF 4A | SUB Y, BA | 16 |
| CF 4B | SUB Y, HL | 16 |
| CF 4C | SUB SP, BA | 16 |
| CF 4D | SUB SP, HL | 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
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 overflow 16-bits signed range (< -32768 OR > 32767)
Sign: Set when bit 15 of the result is 1
Examples
; BA = 0x2EF0
SUB BA, $1337
; BA = 0x1BB9 (0x2EF0 - 0x1337 = 0x(0)1BB9)
; F = (Zero=0):(Carry=0):(Overflow=0):(Sign=0)
; HL = 0xBB7E
; BA = 0xCF12
SUB BA, HL
; HL = 0xBB7E
; BA = 0xEC6C (0xCF12 - 0xBB7E = 0x(1)EC6C)
; F = (Zero=0):(Carry=1):(Overflow=0):(Sign=1)