Z80 Instruction Set — Data Movement

EX

EX DE,HL

Operation	Exchanges the 16-bit contents of DE and HL.
Op Code	11101011
T States	4

EX AF,AF'

Operation	Exchanges the 16-bit contents of AF and AF'.
Op Code	00001000
T States	4

EX (SP),HL

Operation	Exchanges (SP) with L, and (SP+1) with H.
Op Code	11100011
T States	19

EX (SP),reg_index

Operation	Exchanges (SP) with the LSB of regindex, and (SP+1) with the MSB of regindex.
Op Code	[regindex] : 11100011 Register Bit Field IX 11011101 IY 11111101
T States	23

EXX

EXX

Operation	Exchanges the 16-bit contents of BC, DE, and HL with BC', DE', and HL'.
Op Code	11011001
T States	4

LD

LD reg₈D,reg₈S

Operation	The contents of register reg8S are stored into reg8D.
Op Code	01[reg8D][reg8S] Register Bit Field A 111 B 000 C 001 D 010 E 011 H 100 L 101 (HL) 110
T States	4 or 7 (HL)

LD reg₈,imm₈

Operation	Stores the immediate value into reg8.
Op Code	00[reg8]110 : [imm8] Register Bit Field A 111 B 000 C 001 D 010 E 011 H 100 L 101 (HL) 110
T States	7 or 10 (HL)

LD reg₈,(reg_index + ofs₈)

Operation	Stores the value pointed to by regindex plus ofs8 into reg8.
Op Code	[regindex] : 01[reg8]110 : [ofs8] Register Bit Field IX 11011101 IY 11111101 Register Bit Field A 111 B 000 C 001 D 010 E 011 H 100 L 101
T States	19

LD (reg_index + ofs₈),reg₈

Operation	Stores reg8 into the memory location pointed to by regindex plus ofs8.
Op Code	regindex : 01110[reg8] : [ofs8] Register Bit Field IX 11011101 IY 11111101 Register Bit Field A 111 B 000 C 001 D 010 E 011 H 100 L 101
T States	19

LD (reg_index + ofs₈), imm₈

Operation	Stores the immediate data into the memory location pointed to by regindex plus ofs8.
Op Code	[regindex] : 00110110 : [ofs8] : [imm8] Register Bit Field IX 11011101 IY 11111101
T States	19

LD A,(reg₁₆)

Operation	Stores the value pointed to by reg16 into A.
Op Code	000[reg16]1010 Register Bit Field BC 0 DE 1
T States	7

LD A,(imm₁₆)

Operation	Stores the value pointed to by imm16 into A.
Op Code	00111010 : [immLSB] : [immMSB]
T States	13

LD (reg₁₆),A

Operation	Stores A into the memory location pointed to by reg16. Register Bit Field BC 0 DE 1
Op Code	000[reg16]0010
T States	7

LD (imm₁₆),A

Operation	Stores A into the memory location pointed to by imm16.
Op Code	00110010 : [immLSB] : [immMSB]
T States	13

LD A,{ I | R }

Operation	Stores the value of register I or R into A
Op Code	11101101 : 0101[reg]111 Register Bit Field I 0 R 1
Flags	S Z are affected as defined. H N are reset. P/V holds IFF2. C is unaffected.
T States	9

LD { I | R },A

Operation	Stores the value of A into register I or R.
Op Code	11101101 : 0100[reg]111 Register Bit Field I 0 R 1
T States	9

LD reg₁₆,imm₁₆

Operation	Stores the immediate data into register reg16.
Op Code	00[reg16]0001 : [immLSB] : [immMSB] Register Bit Field BC 00 DE 01 HL 10 SP 11
T States	10

LD reg_index,imm₁₆

Operation	Loads the immediate data into index register regindex
Op Code	[regindex] : 00100001 : [immLSB] : [immMSB] Register Bit Field IX 11011101 IY 11111101
T States	14

LD HL,(imm₁₆)

Operation	Loads the value pointed to by imm16 into HL.
Op Code	00101010 : [immLSB] : [immMSB]
T States	16

LD reg₁₆,(imm₁₆)

Operation	Loads the value pointed to by imm16 into register reg16.
Op Code	11101101 : 01[reg16]1011 : [immLSB] : [immMSB] Register Bit Field BC 00 DE 01 HL (see Undocumented) 10 SP 11
T States	20

LD reg_index,(imm₁₆)

Operation	Loads the value pointed to by imm16 into index register regindex.
Op Code	[regindex] : 00101010 : [immLSB] : [immMSB] Register Bit Field IX 11011101 IY 11111101
T States	20

LD (imm₁₆),HL

Operation	Stores the value of HL into the memory location pointed to by imm16.
Op Code	00100010 : [immLSB] : [immMSB]
T States	16

LD (imm₁₆),reg₁₆

Operation	Stores the value of register reg16 into the memory location pointed to by imm16.
Op Code	11101101 : 01[reg16]0011 : [immLSB] : [immMSB] Register Bit Field BC 00 DE 01 HL (see Undocumented) 10 SP 11
T States	20

LD (imm₁₆),reg_index

Operation	Stores the value of index register regindex into the memory location pointed to by imm16.
Op Code	[regindex] : 00100010 : [immLSB] : [immMSB] Register Bit Field IX 11011101 IY 11111101
T States	20

LD SP,HL

Operation	Loads the value of HL into SP
Op Code	11111001
T States	6

LD SP,reg_index

Operation	Loads the value of index register regindex into SP.
Op Code	[regindex] : 11111001 Register Bit Field IX 11011101 IY 11111101
T States	10

LDD

LDD

Operation	Transfers a byte of data from the memory location pointed to by HL to the memory location pointed to by DE. Then HL, DE, and BC are decremented.
Op Code	11101101 : 10101000
Flags	S Z C are not affected H N are reset P/V is reset if BC becomes zero. Reset otherwise.
T States	16

LDDR

LDDR

Operation	Transfers a byte of data from the memory location pointed to by HL to the memory location pointed to by DE. Then HL, DE, and BC are decremented. If BC is not zero, this operation is repeated. Interrupts can trigger while this instruction is processing.
Op Code	11101101 : 10111000
Flags	S Z C are not affected H N P/V are reset
T States	If BC != 0: 21 If BC == 0: 16

LDI

LDI

Operation	Transfers a byte of data from the memory location pointed to by HL to the memory location pointed to by DE. Then HL and DE are incremented and BC is decremented.
Op Code	11101101 : 10100000
Flags	S Z C are not affected H N are reset P/V is reset if BC becomes zero. Reset otherwise.
T States	16

LDIR

LDIR

Operation	Transfers a byte of data from the memory location pointed to by HL to the memory location pointed to by DE. Then HL and DE are incremented and BC is decremented. If BC is not zero, this operation is repeated. Interrupts can trigger while this instruction is processing.
Op Code	11101101 : 10110000
Flags	S Z C are not affected H N P/V are reset
T States	If BC != 0: 21 If BC == 0: 16

POP

POP reg₁₆

Operation	The memory location pointed to by SP is stored into regLSB and SP is incremented. The memory location pointed to by SP is stored into regMSB and SP is incremented again
Op Code	11[reg16]0001 Register Bit Field BC 00 DE 01 HL 10 AF 11
T States	10

POP reg_index

Operation	The memory location pointed to by SP is stored into regLSB and SP is incremented. The memory location pointed to by SP is stored into regMSB and SP is incremented again
Op Code	[regindex] : 11100001 Register Bit Field IX 11011101 IY 11111101
T States	14

PUSH

PUSH reg₁₆

Operation	SP is decremented and regMSB is stored into the memory location pointed to by SP. SP is decremented again and regLSB is stored into the memory location pointed to by SP.
Op Code	11[reg16]0101 Register Bit Field BC 00 DE 01 HL 10 AF 11
T States	11

PUSH reg_index

Operation	SP is decremented and regMSB is stored into the memory location pointed to by SP. SP is decremented again and regLSB is stored into the memory location pointed to by SP.
Op Code	[regindex] : 11100101 Register Bit Field IX 11011101 IY 11111101
T States	15