Difference between revisions of "ADD"
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| + | {{Opcode}} | ||
ADD is an assembly opcode. | ADD is an assembly opcode. | ||
| − | = add a,reg8 = | + | == add a,reg8 == |
Adds the contents of an 8-bit register to the contents of accumulator and stores the result in accumulator. | Adds the contents of an 8-bit register to the contents of accumulator and stores the result in accumulator. | ||
| Line 12: | Line 13: | ||
*$86: add a,(hl) | *$86: add a,(hl) | ||
*$87: add a,a | *$87: add a,a | ||
| + | *$C6 $XX: add a,$XX | ||
| + | |||
| + | Returns: | ||
| + | *Z - Set if result is zero. | ||
| + | *N - Reset. | ||
| + | *H - Set if carry from bit 3. | ||
| + | *C - Set if carry from bit 7. | ||
| + | |||
| + | == add hl,reg16 == | ||
| + | Adds the contents of a 16-bit register to the contents of hl and stores the result in hl. | ||
| + | |||
| + | *$09: add hl,bc | ||
| + | *$19: add hl,de | ||
| + | *$29: add hl,hl | ||
| + | *$39: add hl,sp | ||
| + | |||
| + | Returns: | ||
| + | *Z - Unaffected. | ||
| + | *N - Reset. | ||
| + | *H - Set if carry from bit 11. | ||
| + | *C - Set if carry from bit 15. | ||
| + | |||
| + | == add sp,2comp == | ||
| + | Adds an 8-bit 2's complement value to sp and stores the result in sp. | ||
| + | |||
| + | *$E8: add sp,2comp | ||
| + | |||
| + | Returns: | ||
| + | *Z - Reset. | ||
| + | *N - Reset. | ||
| + | *H - Set or reset according to operation. | ||
| + | *C - Set or reset according to operation. | ||
| + | |||
| + | [[Category:Assembly_Opcodes]] | ||
Latest revision as of 22:09, 5 March 2008
This is an article about the GB-Z80 CPU.
Opcodes:
Arithmetic and logical: ADD - ADD (16-bit) including LD HL,SP+nn - ADC - AND - CP - CPL - DAA - DEC - DEC and INC (16-bit) - INC - SBC - SUB - OR - XOR
Conditional: CALL - JP - JR - RET
Load: LD (8-bit) - LD (16-bit)
Extended Set: BIT - RES - RL - RLC - RR - RRC - SET - SLA - SRA - SRL - SWAP
ADD is an assembly opcode.
add a,reg8
Adds the contents of an 8-bit register to the contents of accumulator and stores the result in accumulator.
- $80: add a,b
- $81: add a,c
- $82: add a,d
- $83: add a,e
- $84: add a,h
- $85: add a,l
- $86: add a,(hl)
- $87: add a,a
- $C6 $XX: add a,$XX
Returns:
- Z - Set if result is zero.
- N - Reset.
- H - Set if carry from bit 3.
- C - Set if carry from bit 7.
add hl,reg16
Adds the contents of a 16-bit register to the contents of hl and stores the result in hl.
- $09: add hl,bc
- $19: add hl,de
- $29: add hl,hl
- $39: add hl,sp
Returns:
- Z - Unaffected.
- N - Reset.
- H - Set if carry from bit 11.
- C - Set if carry from bit 15.
add sp,2comp
Adds an 8-bit 2's complement value to sp and stores the result in sp.
- $E8: add sp,2comp
Returns:
- Z - Reset.
- N - Reset.
- H - Set or reset according to operation.
- C - Set or reset according to operation.
