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Load

LD

8 bit

Load register

The contents of register reg8S are stored into reg8D. Includes 1R cycle for ld reg8D, (hl) or 1W cycle for ld (hl), reg8S.

  • Opcode: 01 reg8D reg8S
    Register Bit Field
    a 111
    b 000
    c 001
    d 010
    e 011
    h 100
    l 101
    (hl) 110
  • Bytes: 1
  • Flags: None
  • Cycles: 1F (+1R/1W)

Stores the high byte of regih into reg8.

  • Opcode: regih 01100 reg8
    Index Bit Field
    ixh 11011101
    iyh 11111101
    Register Bit Field
    a 111
    b 000
    c 001
    d 010
    e 011
    ixh/iyh 100
    ixl/iyl 101
  • Bytes: 2
  • Flags: None
  • Cycles: 2F

Stores the low byte of regil into reg8.

  • Opcode: regil 01101 reg8
    Index Bit Field
    ixl 11011101
    iyl 11111101
    Register Bit Field
    a 111
    b 000
    c 001
    d 010
    e 011
    ixh/iyh 100
    ixl/iyl 101
  • Bytes: 2
  • Flags: None
  • Cycles: 2F

Stores reg8 into the high byte of regih.

  • Opcode: regih 01100 reg8
    Index Bit Field
    ixh 11011101
    iyh 11111101
    Register Bit Field
    a 111
    b 000
    c 001
    d 010
    e 011
    ixh/iyh 100
    ixl/iyl 101
  • Bytes: 2
  • Flags: None
  • Cycles: 2F

Stores reg8 into the low byte of regil.

  • Opcode: regil 01101 reg8
    Index Bit Field
    ixl 11011101
    iyl 11111101
    Register Bit Field
    a 111
    b 000
    c 001
    d 010
    e 011
    ixh/iyh 100
    ixl/iyl 101
  • Bytes: 2
  • Flags: None
  • Cycles: 2F

Stores an immediate value imm8 into reg8.

  • Opcode: 01 reg8 110 imm8
    Register Bit Field
    a 111
    b 000
    c 001
    d 010
    e 011
    h 100
    l 101
    (hl) 110
  • Bytes: 2
  • Flags: None
  • Cycles: 2F

Stores imm8 into the high byte of regih.

  • Opcode: regih 00100110 imm8
    Index Bit Field
    ixh 11011101
    iyh 11111101
  • Bytes: 3
  • Flags: None
  • Cycles: 3F

Stores imm8 into the low byte of regil.

  • Opcode: regil 00101110 imm8
    Index Bit Field
    ixl 11011101
    iyl 11111101
  • Bytes: 3
  • Flags: None
  • Cycles: 3F

Load pointer

Stores the byte of memory pointed to by imm24 into reg8.

  • Opcode: 00111010 imm24
  • Bytes: 4
  • Flags: None
  • Cycles: 4F+1R

Stores the byte of memory pointed to by reg24 into reg8.

  • Opcode: 000 reg24 1010
    Register Bit Field
    bc 0
    de 1
  • Bytes: 1
  • Flags: None
  • Cycles: 1F+1R

Stores the byte of memory pointed to by regi + ofs8 into reg8.

  • Opcode: regi 01 reg8 110 ofs8
    Index Bit Field
    ix 11011101
    iy 11111101
    Register Bit Field
    a 111
    b 000
    c 001
    d 010
    e 011
    h 100
    l 101
    (hl) 110
  • Bytes: 3
  • Flags: None
  • Cycles: 3F+1R

Store pointer

Stores reg8 into the address pointed to by imm24.

  • Opcode: 00110010 imm24 (little endian)
  • Bytes: 4
  • Flags: None
  • Cycles: 4F+1W

Stores reg8 into the address pointed to by reg24.

  • Opcode: 000 reg24 0010
    Register Bit Field
    bc 0
    de 1
  • Bytes: 1
  • Flags: None
  • Cycles: 1F+1W

Stores reg8 into the address pointed to by regi + ofs8.

  • Opcode: regi 01110 reg8 ofs8
    Index Bit Field
    ix 11011101
    iy 11111101
    Register Bit Field
    a 111
    b 000
    c 001
    d 010
    e 011
    h 100
    l 101
    (hl) 110
  • Bytes: 3
  • Flags: None
  • Cycles: 3F+1W

Stores imm8 into the address pointed to by regi + ofs8.

  • Opcode: regi 00110110 ofs8 imm8
    Index Bit Field
    ix 11011101
    iy 11111101
  • Bytes: 4
  • Flags: None
  • Cycles: 4F+1W

24 bit

Load register

Stores hl into sp.

  • Opcode: 11111001
  • Bytes: 1
  • Flags: None
  • Cycles: 1F

Stores regi into sp.

  • Opcode: regi 11111001
    Index Bit Field
    ix 11011101
    iy 11111101
  • Bytes: 2
  • Flags: None
  • Cycles: 2F

Stores imm24 into reg24.

  • Opcode: 00 reg24 0001 imm24
    Register Bit Field
    bc 00
    de 01
    hl 10
    sp 11
  • Bytes: 4
  • Flags: None
  • Cycles: 4F

Stores imm24 into regi.

  • Opcode: regi 00100001 imm24
    Index Bit Field
    ix 11011101
    iy 11111101
  • Bytes: 5
  • Flags: None
  • Cycles: 5F

Load pointer

Stores the value pointed to by imm24 into hl.

  • Opcode: 00101010 imm24
  • Bytes: 4
  • Flags: None
  • Cycles: 4F+3R

Stores the value pointed to by imm24 into reg24.

  • Opcode: 11101101 01 reg24 1011 imm24
    Register Bit Field
    bc 00
    de 01
    hl 10
    sp 11
  • Bytes: 5
  • Flags: None
  • Cycles: 5F+3R

Stores the value pointed to by imm24 into regi.

  • Opcode: regi 00101010 imm24
    Index Bit Field
    ix 11011101
    iy 11111101
  • Bytes: 5
  • Flags: None
  • Cycles: 5F+3R

Loads reg24 with the word of memory pointed to by hl.

  • Opcode: 11101101 00 reg24 0111
    Register Bit Field
    bc 00
    de 01
    hl 10
  • Bytes: 2
  • Flags: None
  • Cycles: 2F + 3R

Loads regi with the word of memory pointed to by hl.

  • Opcode: 11101101 regi
    Index Bit Field
    ix 00110111
    iy 00110001
  • Bytes: 2
  • Flags: None
  • Cycles: 2F + 3R

Loads the word of memory pointed to by regi + ofs8 into reg24.

  • Opcode: regi 00 reg24 0111 ofs8
    Index Bit Field
    ix 11011101
    iy 11111101
    Register Bit Field
    bc 00
    de 01
    hl 10
  • Bytes: 3
  • Flags: None
  • Cycles: 3F + 3R

Loads regi with the word of memory pointed to by ix plus ofs8.

  • Opcode: 11011101 regi ofs8
    Index Bit Field
    ix 00110111
    iy 00110001
  • Bytes: 3
  • Flags: None
  • Cycles: 3F + 3R

Loads regi with the word of memory pointed to by iy plus ofs8.

  • Opcode: 11111101 regi ofs8
    Index Bit Field
    ix 00110111
    iy 00110001
  • Bytes: 3
  • Flags: None
  • Cycles: 3F + 3R

Store pointer

Stores hl to the address pointed to by imm24.

  • Opcode: 00100010 imm24
  • Bytes: 4
  • Flags: None
  • Cycles: 4F+3W

Stores reg24 to the address pointed to by imm24.

  • Opcode: 11101101 01 reg24 0011 imm24
    Register Bit Field
    bc 00
    de 01
    hl 10
    sp 11
  • Bytes: 5
  • Flags: None
  • Cycles: 5F+3W

Stores regi to the address pointed to by imm24.

  • Opcode: regi 00100010 imm24
    Index Bit Field
    ix 11011101
    iy 11111101
  • Bytes: 5
  • Flags: None
  • Cycles: 5F+3W

Stores reg24 into the word of memory pointed to by regi + ofs8.

  • Opcode: regi 00 reg24 1111 ofs8
    Index Bit Field
    ix 11011101
    iy 11111101
    Register Bit Field
    bc 00
    de 01
    hl 10
  • Bytes: 3
  • Flags: None
  • Cycles: 3F + 3W

Loads the word of memory at ix plus ofs8 with regi.

  • Opcode: 11011101 regi ofs8
    Index Bit Field
    ix 00111111
    iy 00111110
  • Bytes: 3
  • Flags: None
  • Cycles: 3F + 3W

Loads the word of memory at iy plus ofs8 with regi.

  • Opcode: 11111101 regi ofs8
    Index Bit Field
    ix 00111111
    iy 00111110
  • Bytes: 3
  • Flags: None
  • Cycles: 3F + 3W

Memory / Interrupts

Stores the value of reg8 into regir.

  • Opcode: 11101101 0100 regir 111
    Register Bit Field
    i 0
    r 1
  • Bytes: 2
  • Flags: None
  • Cycles: 2F

Stores the value of regir into reg8.

  • Opcode: 11101101 0101 regir 111
    Register Bit Field
    i 0
    r 1
  • Bytes: 2
  • Flags:
    • S: Affected as defined
    • Z: Affected by defined
    • H: Reset
    • N: Reset
    • P/V: Interrupt flag state
  • Cycles: 2F

Stores the value of a into mb.

  • Opcode: 11101101 01101101
  • Bytes: 2
  • Flags: None
  • Cycles: 2F

Stores the value of mb into a.

  • Opcode: 11101101 01101110
  • Bytes: 2
  • Flags: None
  • Cycles: 2F

LEA

Loads regi with the value of ix plus ofs8.

  • Opcode: 11101101 regi ofs8
    Index Bit Field
    ix 01010100
    iy 00110011
  • Bytes: 3
  • Flags: None
  • Cycles: 3F

Loads regi with the value of iy plus ofs8.

  • Opcode: 11101101 regi ofs8
    Index Bit Field
    ix 00110010
    iy 01010101
  • Bytes: 3
  • Flags: None
  • Cycles: 3F

Loads reg24 with the value of regi + ofs8.

  • Opcode: regi 00 reg24 001 regi ofs8
    Index Bit Field
    ix 11011101, 0
    iy 11111101, 1
    Register Bit Field
    bc 00
    de 01
    hl 10
  • Bytes: 3
  • Flags: None
  • Cycles: 3F

PEA

The value of regi plus ofs8 is pushed to the stack.

  • Opcode: 11101101 011001 regi ofs8
    Index Bit Field
    ix 01
    iy 10
  • Bytes: 3
  • Flags: None
  • Cycles: 3F + 3W

POP

The word of memory pointed to by sp is stored into reg24 and sp is incremented by the word size.

  • Opcode: 11 reg24 0001
    Register Bit Field
    bc 00
    de 01
    hl 10
    af 11
  • Bytes: 1
  • Flags: None
  • Cycles: 1F+3R

The word of memory pointed to by sp is stored into regi and sp is incremented by the word size.

  • Opcode: regi 11100001
    Register Bit Field
    ix 11011101
    iy 11111101
  • Bytes: 2
  • Flags: None
  • Cycles: 2F+3R

PUSH

sp is decremented by the word size and reg24 is stored into the word of memory pointed to by sp.

  • Opcode: 11 reg24 0101
    Register Bit Field
    bc 00
    de 01
    hl 10
    af 11
  • Bytes: 1
  • Flags: None
  • Cycles: 1F+3W

sp is decremented by the word size and regi is stored into the word of memory pointed to by sp.

  • Opcode: regi 11100101
    Register Bit Field
    ix 11011101
    iy 11111101
  • Bytes: 2
  • Flags: None
  • Cycles: 2F+3W