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GameBoy CPU InstructionSet Sheet (GCISheet)
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QuickJump Navigator:
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ADC A,n
ADD A,n
ADD HL,n
ADD SP,n
AND n
BIT b,r
CALL n
CALL cc,n
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CCF
CP n
CPL
DAA
DEC n
DEC nn
DI
EI
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INC n
INC nn
JP n
JP cc,n
JP [HL]
JR n
JR cc,n
HALT
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LD A,n
LD n,A
LD A,[C]
LD A,[HL+]
LD A,[HL-]
LD A,[HLI]
LD A,[HLD]
LD [C],A
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LD [HL+],A
LD [HL-],A
LD [HLI],A
LD [HLD],A
LD r1,r2
LD n,nn
LD HL,[SP+n]
LD SP,HL
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LD [n],SP
LDD A,[HL]
LDD [HL],A
LDH [n],A
LDH A,[n]
LDHL SP,n
LDI A,[HL]
LDI [HL],A
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NOP
OR n
POP nn
PUSH nn
RES b,r
RET
RET cc
RETI
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RL n
RLC n
RR n
RRC n
RST n
SBC A,n
SCF
SET b,r
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SLA n
SRA n
SRL n
STOP
SUB n
SWAP n
XOR n
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ADC A,n - Add n + Carry flag to A.
n = A,B,C,D,E,H,L,(HL),#
Flags affected:
Z - Set if result is zero.
N - Reset.
H - Set if carry from bit 3.
C - Set if carry from bit 7.
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ADD A,n - Add n to A.
n = A,B,C,D,E,H,L,(HL),#
Flags affected:
Z - Set if result is zero.
N - Reset.
H - Set if carry from bit 3.
C - Set if carry from bit 7.
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ADD HL,n - Add n to HL.
n = BC,DE,HL
Flags affected:
Z - Not affected
N - Reset.
H - Set if carry from bit 11.
C - Set if carry from bit 15.
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ADD SP,n - Add n to Stack Pointer (SP).
n = one byte signed immediate value
Flags affected:
Z - Reset.
N - Reset.
H - Set or reset according to operation.
C - Set or reset according to operation.
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AND n - Logically AND n with A, result in A.
n = A,B,C,D,E,H,L,(HL),#
Flags affected:
Z - Set if result is zero.
N - Reset.
H - Set.
C - Reset.
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BIT b,r - Test bit b in register r.
b = 0-7, r = A,B,C,D,E,H,L,(HL)
Flags affected:
Z - Set if bit b of register r is 0.
N - Reset.
H - Set.
C - Not affected.
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CALL n - Push address of next instruction onto
stack and then jump to address n.
Flags affected:
None
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CALL cc,n - Call address n if following condition
is true:
cc = NZ, Call if Z flag is reset.
cc = Z, Call if Z flag is set.
cc = NC, Call if C flag is reset.
cc = C, Call if C flag is set.
Flags affected:
None
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CCF - Complement carry flag.
If C flag is set then reset it.
If C flag is reset then set it.
Flags affected:
Z - Not affected.
N - Reset.
H - Reset.
C - Complemented.
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CP n - Compare A with n.
This is basically an A - n subtraction
instruction but the results are thrown away.
n = A,B,C,D,E,H,L,(HL),#
Flags affected:
Z - Set if result is zero. (Set if A = n)
N - Set.
H - Set if no borrow from bit 4.
C - Set for no borrow. (Set if A < n.)
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CPL - Complement A register. (Flip all bits.)
Flags affected:
Z - Not affected.
N - Set.
H - Set.
C - Not affected.
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DAA - Decimal adjust register A.
This instruction adjusts register A so that the
correct representation of Binary Coded Decimal
(BCD) is obtained.
Flags affected:
Z - Set if register A is zero.
N - Not affected.
H - Reset.
C - Set of reset according to operation.
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DEC n - Decrement register n.
n = A,B,C,D,E,H,L,(HL)
Flags affected:
Z - Set if result is zero.
N - Set.
H - Set if no borrow from bit 4.
C - Not affected.
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DEC nn - Decrement register nn.
nn = BC,DE,HL,SP
Flags affected:
None
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DI - Disable interrupts.
Flags affected:
None
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EI - Enable interrupts.
This instruction enables the interrupts but not immediately.
Interrupts are enabled after the instruction after EI is
executed.
Flags affected:
None
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INC n - Increment register n.
n = A,B,C,D,E,H,L,(HL)
Flags affected:
Z - Set if result is zero.
N - Reset.
H - Set if carry from bit 3.
C - Not affected.
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INC nn - Increment register nn.
n = BC,DE,HL,SP
Flags affected:
None
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JP n - Jump to address n.
n = two byte immediate value. (LSByte first)
Flags affected:
None
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JP cc,n - Jump to address n if following condition
is true:
n = two byte immediate value. (LSByte first.)
cc = NZ, Jump if Z flag is reset.
cc = Z, Jump if Z flag is set.
cc = NC, Jump if C flag is reset.
cc = C, Jump if C flag is set.
Flags affected:
None
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JP [HL] - Jump to address contained in HL.
Flags affected:
None
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JR n - Add n to current address and jump to it.
n = one byte signed immediate value.
Flags affected:
None
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JR cc,n - If following condition is true then
add n to current address and jump to it:
n = one byte signed immediate value
cc = NZ, Jump if Z flag is reset.
cc = Z, Jump if Z flag is set.
cc = NC, Jump if C flag is reset.
cc = C, Jump if C flag is set.
Flags affected:
None
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HALT - Power down CPU until an interrupt occurs.
Flags affected:
None
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LD A,n - Put value n into A.
n = A,B,C,D,E,H,L,(BC),(DE),(HL),(nnnn),#
Flags affected:
None
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LD n,A - Put value A into n.
n = A,B,C,D,E,H,L,(BC,(DE),(HL),(nnnn)
Flags affected:
None
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LD A,[C] - Put value at address $FF00 + register C into A.
Flags affected:
None
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LD A,[HL+] - Same as LD A,[HLI].
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LD A,[HL-] - Same as LD A,[HLD].
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LD A,[HLI] - Put value at address HL into A. Increment HL.
Flags affected:
None
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LD A,[HLD] - Put value at address HL into A. Decrement HL.
Flags affected:
None
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LD [C],A - Put A into address $FF00 + register C.
Flags affected:
None
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LD [HL+],A - Same as LD [HLI],A.
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LD [HL-],A - Same as LD [HLD],A.
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LD [HLI],A - Put A into memory address HL. Increment HL.
Flags affected:
None
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LD [HLD],A - Put A into memory address HL. Decrement HL.
Flags affected:
None
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LD r1,r2 - Put value r2 into r1.
Flags affected:
None
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LD n,nn - Put value nn into n.
n = BC,DE,HL,SP
nn = 16 bit immediate value
Flags affected:
None
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LD HL,[SP+n] - Put SP + n into HL.
n = one byte signed immediate value
Flags affected:
Z - Reset.
N - Reset.
H - Set or reset according to operation.
C - Set or reset according to operation.
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LD SP,HL - Put HL into Stack Pointer (SP).
Flags affected:
None
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LD [n],SP - Put Stack Pointer (SP) at address n.
n = two byte immediate address
Flags affected:
None
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LDD A,[HL] - Same as LD A,[HLD].
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LDD [HL],A - Same as LD [HLD],A.
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LDH [n],A - Put A into memory address $FF00 + n.
n = one byte immediate value
Flags affected:
None
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LDH A,[n] - Put memory address $FF00 + n into A.
n = one byte immediate value
Flags affected:
None
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LDHL SP,n - Same as LD HL,[SP+n]
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LDI A,[HL] - Same as LD A,[HLI].
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LDI [HL],A - Same as LD [HLI],A.
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NOP - No operation.
Flags affected:
None
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OR n - Logical OR n with register A, result in A.
n = A,B,C,D,E,H,L,(HL),#
Flags affected:
Z - Set if result is zero.
N - Reset.
H - Reset.
C - Reset.
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POP nn - Pop two bytes off stack into register pair nn.
Increment Stack Pointer (SP) twice.
nn = AF,BC,DE,HL
Flags affected:
None
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PUSH nn - Push register pair nn onto stack.
Decrement Stack Pointer (SP) twice.
nn = AF,BC,DE,HL
Flags affected:
None
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RES b,r - Reset bit b in register r.
b = 0-7, r = A,B,C,D,E,H,L,(HL)
Flags affected:
None
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RET - Pop two bytes from stack & jump to that address.
Flags affected:
None
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RET cc - Return if following condition is true:
cc = NZ, Return if Z flag is reset.
cc = Z, Return if Z flag is set.
cc = NC, Return if C flag is reset.
cc = C, Return if C flag is set.
Flags affected:
None
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RETI - Pop two bytes from stack & jump to that address
then enable interrupts.
Flags affected:
None
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RL n - Rotate n left through Carry flag.
n = A,B,C,D,E,H,L,(HL)
Flags affected:
Z - Set if result is zero.
N - Reset.
H - Reset.
C - Contains old bit 7 data.
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RLC n - Rotate n left. Old bit 7 to Carry flag.
n = A,B,C,D,E,H,L,(HL)
Flags affected:
Z - Set if result is zero.
N - Reset.
H - Reset.
C - Contains old bit 7 data.
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RR n - Rotate n right through Carry flag.
n = A,B,C,D,E,H,L,(HL)
Flags affected:
Z - Set if result is zero.
N - Reset.
H - Reset.
C - Contains old bit 0 data.
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RRC n - Rotate n right. Old bit 0 to Carry flag.
n = A,B,C,D,E,H,L,(HL)
Flags affected:
Z - Set if result is zero.
N - Reset.
H - Reset.
C - Contains old bit 0 data.
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RST n - Push present address onto stack.
Jump to address $0000 + n.
n = $00,$08,$10,$18,$20,$28,$30,$38
Flags affected:
None
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SBC A,n - Subtract n + Carry flag from A.
n = A,B,C,D,E,H,L,(HL),#
Flags affected:
Z - Set if result is zero.
N - Set.
H - Set if no borrow from bit 4.
C - Set if no borrow.
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SCF - Set Carry flag.
Flags affected:
Z - Not affected.
N - Reset.
H - Reset.
C - Set.
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SET b,r - Set bit b in register r.
b = 0-7, r = A,B,C,D,E,H,L,(HL)
Flags affected:
None
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SLA n - Shift n left into Carry. LSBit of n set to 0.
n = A,B,C,D,E,H,L,(HL)
Flags affected:
Z - Set if result is zero.
N - Reset.
H - Reset.
C - Contains old bit 7 data.
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SRA n - Shift n right into Carry. MSBit doesn't change.
n = A,B,C,D,E,H,L,(HL)
Flags affected:
Z - Set if result is zero.
N - Reset.
H - Reset.
C - Contains old bit 0 data.
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SRL n - Shift n right into Carry. MSBit of n set to 0.
n = A,B,C,D,E,H,L,(HL)
Flags affected:
Z - Set if result is zero.
N - Reset.
H - Reset.
C - Contains old bit 0 data.
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STOP - ???
Flags affected:
?
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SUB n - Subtract n from A.
n = A,B,C,D,E,H,L,(HL),#
Flags affected:
Z - Set if result is zero.
N - Set.
H - Set if no borrow from bit 4.
C - Set if no borrow.
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SWAP n - Swap upper & lower bits of n.
n = A,B,C,D,E,H,L,(HL)
Flags affected:
Z - Set if result is zero.
N - Reset.
H - Reset.
C - Reset.
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XOR n - Logical exclusive OR n with
register A, result in A.
n = A,B,C,D,E,H,L,(HL),#
Flags affected:
Z - Set if result is zero.
N - Reset.
H - Reset.
C - Reset.
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