Difference between revisions of "ADD"

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.

Adds the contents of an 8-bit register to the contents of accumulator and stores the result in accumulator.

Returns:

Adds the contents of a 16-bit register to the contents of hl and stores the result in hl.

Returns:

Adds an 8-bit 2's complement value to sp and stores the result in sp.

Returns:

@@ Line 1: / Line 1: @@
+{{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.
-- $80: add a,b
+*$80: add a,b
-- $81: add a,c
+*$81: add a,c
-- $82: add a,d
+*$82: add a,d
-- $83: add a,e
+*$83: add a,e
-- $84: add a,h
+*$84: add a,h
-- $85: add a,l
+*$85: add a,l
-- $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]]