Z80
From CPCWiki - THE Amstrad CPC encyclopedia!
Microprocessor from Zilog, wich is used in the Amstrad CPC Computers. The Z80/Z80A was a very popular microprocessor, used in a great variety of home computers and appliances as far-fetched as satelites. It was even used in the Commodore C128 as a secondary processor in order to achieve CP/M compatibility.
See also
Weblinks
Opcodes
Check the end of the document for explanations of abbreviations used below.
| Mnemonic | Clock | Size | SZHPNC | Opcode | Description | Notes |
| ADC A, r | 4 | 1 | *** V0 * | 88 + rb | Add with Carry | A = A + s + CY |
| ADC A, N | 7 | 2 | ES XX | |||
| ADC A, (HL) | 7 | 1 | 8E | |||
| ADC A, (IX + N) | 19 | 3 | DD 8E XX | |||
| ADC HL, BC | 15 | 2 | **? V0 * | ED 4A | Add with Carry | HL = HL + + ss CY |
| ADC HL, | 15 | 2 | ED 5A | |||
| ADC HL, HL | 15 | 2 | ED 6A | |||
| ADC HL, SP | 15 | 2 | ED 7A | |||
| ADD A, r | 4 | 1 | *** V0 * | 80 + rb | Add (8-bit) | A = A + s |
| ADD A, N | 7 | 2 | C6 XX | |||
| ADD A, (HL) | 7 | 1 | 86 | |||
| ADD A, (IX + N) | 19 | 3 | DD 86 XX | |||
| ADD A, (IY + N) | 19 | 3 | FD 86 XX | |||
| ADD HL, BC | 11 | 1 | --?- 0 * | 09 | Add (16-bit) | HL = HL + ss |
| ADD HL, | 11 | 1 | 19 | |||
| ADD HL, HL | 11 | 1 | 29 | |||
| ADD HL, SP | 11 | 1 | 39 | |||
| ADD IX, BC | 15 | 2 | --?- 0 * | DD 09 | Add (IX register) | IX IX + pp = |
| ADD IX, DE | 15 | 2 | DD 19 | |||
| ADD IX, IX | 15 | 2 | DD 29 | |||
| ADD IX, SP | 15 | 2 | DD 39 | |||
| ADD IY, BC | 15 | 2 | --?- 0 * | FD 09 | Add (IY register) | = IY IY rr + |
| ADD IY, | 15 | 2 | FD 19 | |||
| ADD IY, IY | 15 | 2 | FD 29 | |||
| ADD IY, SP | 15 | 2 | FD 39 | |||
| AND r | 4 | 1 | ***P00 | A0+rb | Logical AND | A=A&s |
| AND N | 7 | 2 | E6 XX | |||
| AND (HL) | 7 | 1 | A6 | |||
| AND (IX+N) | 19 | 3 | DD A6 XX | |||
| AND (IY+N) | 19 | 3 | FD A6 XX |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| ILO b, r | 8 | 2 |? * 1? 0 - | CB 40 +8 * b + rb | Test Bit | m ^ 2 & (b) |
| B ILO, (HL) | 12 | 2 | | CB 46 +8 * b | | |
| B ILO, (IX + N) | 20 | 4 | | XX DD CB 46 +8 * b | |
| B ILO, (IY + N) | 20 | 4 | | XX FD CB 46 +8 * b | |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| CALL NN | 17 | 3 |------| CD XX XX | Unconditional Call | - (SP) = PC, PC = nn |
| CALL C, NN | 17 / 1 | 3 |------| DC XX XX | Conditional Call | If Carry = 1 |
| CALL NC, NN | 17 / 1 | 3 | | D4 XX XX | | If carry = 0 |
| CALL M, NN | 17 / 1 | 3 | | CF XX XX | | If Sign = 1 (negative) |
| CALL P, NN | 17 / 1 | 3 | | F4 XX XX | | If Sign = 0 (positive) |
| CALL Z, NN | 17 / 1 | 3 | | CC XX XX | | If Zero = 1 (ans. = 0) |
| CALL NZ, NN | 17 / 1 | 3 | | C4 XX XX | | If Zero = 0 (non-zero) |
| CALL PE, NN | 17 / 1 | 3 | | EC XX XX | | If Parity = 1 (even) |
| CALL PO, NN | 17 / 1 | 3 | | E4 XX XX | | If Parity = 0 (odd) |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| RTC | 4 | 1 |--?- 0 * | 3F | Complement Carry Flag | CY CY = ~ |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| CP r | 4 | 1 | *** V1 * | + B8 rb | Compare | Compare As |
| CP N | 7 | 2 | | FE XX | | |
| CP (HL) | 7 | 1 | | BE | | |
| CP (IX + N) | 19 | 3 | | DD BE XX | | |
| CP (IY + N) | 19 | 3 | | FD BE XX | | |
| CPD | 16 | 2 |**** 1 - | ED A9 | Compare and Decrement | A - (HL), HL = HL-1, BC =-1 |
| CPDR | 21 / 1 | 2 |**** 1 - | ED B9 | Compare, Dec., Repeat | CPD till A = (HL) or BC = 0 |
| ICC | 16 | 2 |**** 1 - | ED A1 | Compare and Increment | A - (HL), HL HL = +1, BC =-1 |
| CPIR | 21 / 1 | 2 |**** 1 - | ED B1 | Compare, Inc., Repeat | A = till CPI (HL) or BC = 0 |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| CPL | 4 | 1 | - 1-1 - | 2F | Complement | ~ = A |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| DAA | 4 | 1 | P-*** * | 27 | Decimal Adjust Acc. | = BCD format (December) |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| DEC A | 4 | 1 | *** V1-| 3D | Decrement (8-bit) | s = s-1 |
| DEC B | 4 | 1 | | 05 | | |
| DEC C | 4 | 1 | | 0D | | |
| DEC D | 4 | 1 | | 15 | | |
| DEC E | 4 | 1 | | 1D | | |
| DEC H | 4 | 1 | | 25 | | |
| DEC L | 4 | 2 | | 2D | | |
| DEC (HL) | 11 | 1 | | 35 | | |
| DEC (IX + N) | 23 | 3 | | DD 35 XX | | |
| DEC (IY + N) | 23 | 3 | | FD 35 XX | | |
| DEC BC | 6 | 1 |------| 0B | Decrement (16-bit) | = ss ss-1 |
| DEC DE | 6 | 1 | | 1B | | |
| DEC HL | 6 | 1 | | 2B | | |
| DEC SP | 6 | 1 | | 3B | | |
| DEC IX | 10 | 2 |------| DD 2B | Decrement | xx xx-1 = |
| DEC IY | 10 | 2 | | FD 2B | | |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| DI | 4 | 1 |------| F3 | Disable Interrupts | |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| DJNZ $ +2 | 13 / 8 | 1 |------| 10 | Dec., Jump Non-Zero | B = B-1 till B = 0 |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| EI | 4 | 1 FB |------| | Enable Interrupts | |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| EX (SP), HL | 19 | 1 |------| E3 | Exchange | (SP) <-> HL |
| EX (SP), IX | 23 | 2 |------| DD E3 | | (SP) <-> xx |
| EX (SP), IY | 23 | 2 | | FD E3 | | |
| EX AF, AF '| 4 | 1 |------| 08 | | EF <-> AF' |
| EX DE, HL | 4 | 1 EB |------| | | DE <-> HL |
| EXX | 4 | 1 |------| D9 | Exchange | qq <-> qq '(except EF) |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| HALT | 4 | 1 |------| 76 | Halt | |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| IM 0 | 8 | 2 |------| ED 46 | Interrupt Mode | (n = 0,1,2) |
| IM 1 | 8 | 2 | | ED 56 | | |
| IM 2 | 8 | 2 | | ED 5E | | |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| IN A, (N) | 11 | 2 |------| DB XX | Input | = (n) |
| IN (C) | 12 | 2 | *** P0-| ED 70 | * Input | (Unsupported) |
| IN A, (C) | 12 | 2 | *** P0-| ED 78 | Input | r = (C) |
| IN B, (C) | 12 | 2 | | ED 40 | | |
| IN C, (C) | 12 | 2 | | ED 48 | | |
| IN D, (C) | 12 | 2 | | ED 50 | | |
| IN E, (C) | 12 | 2 | | ED 58 | | |
| IN H, (C) | 12 | 2 | | ED 60 | | |
| IN L, (C) | 12 | 2 | | ED 68 | | |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| INC A | 4 | 1 | *** V0-| 3C | Increment (8-bit) | r = r +1 |
| INC B | 4 | 1 | | 04 | | |
| INC C | 4 | 1 | | 0C | | |
| INC D | 4 | 1 | | 14 | | |
| E INC | 4 | 1 | | 1C | | |
| INC H | 4 | 1 | | 24 | | |
| INC L | 4 | 1 | | 2C | | |
| BC INC | 6 | 1 |------| 03 | Increment (16-bit) | ff ff = +1 |
| INC DE | 6 | 1 | | 13 | | |
| HL INC | 6 | 1 | | 23 | | |
| SP INC | 6 | 1 | | 33 | | |
| IX INC | 10 | 2 |------| DD 23 | Increment | xx xx +1 = |
| IY INC | 10 | 2 | | FD 23 | | |
| INC (HL) | 11 | 1 | *** V0-| 34 | Increment (indirect) | (HL) = (HL) +1 |
| INC (IX + N) | 23 | 3 | *** V0-| DD 34 XX | Increment | (xx + d) = (xx + d) +1 |
| INC (IY + N) | 23 | 3 | | FD 34 XX | | |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| IND | 16 | 2 |?*?? 1 - | ED AA | Input and Decrement | (HL) = (C), HL = HL-1, B = B-1 |
| INDR | 21 / 1 | 2 |? 1? 1 - | ED BA | Input, Dec., Repeat | IND till B = 0 |
| INI | 16 | 2 |?*?? 1 - | ED A2 | Input and Increment | (HL) = (C), HL HL = +1, B = B-1 |
| INIR | 21 / 1 | 2 |? 1? 1 - | ED B2 | Input, Inc., Repeat | INI till B = 0 |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| JP $ NN | 10 | 3 |------| C3 XX XX | Unconditional Jump | PC = nn |
| JP (HL) | 4 | 1 |------| E9 | Unconditional Jump | PC (HL) = |
| JP (IX) | 8 | 2 |------| DD E9 | Unconditional Jump | PC (xx) = |
| JP (IY) | 8 | 2 | | FD E9 | | |
| JP C $ NN | 10 / 1 | 3 |------| DA XX XX | Conditional Jump | If Carry = 1 |
| JP NC, $ NN | 10 / 1 | 3 | | D2 XX XX | | If Carry = 0 |
| JP M, $ NN | 10 / 1 | 3 | | FA XX XX | | If Sign = 1 (negative) |
| JP P $ NN | 10 / 1 | 3 | | F2 XX XX | | If Sign = 0 (positive) |
| JP Z, $ NN | 10 / 1 | 3 | | CA XX XX | | If Zero = 1 (ans. = 0) |
| JP NZ $ NN | 10 / 1 | 3 | | C2 XX XX | | If Zero = 0 (non-zero) |
| JP PE, $ NN | 10 / 1 | 3 | | EA XX XX | | If Parity = 1 (even) |
| JP PO, $ NN | 10 / 1 | 3 | | E2 XX XX | | If Parity = 0 (odd) |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| JR $ N +2 | 12 | 2 |------| 18 XX | Relative Jump | PC = PC + e |
| JR C, N +2 $ | 12 / 7 | 2 |------| 38 XX | Cond. Relative Jump | If cc JR (cc = C, NC, NZ, Z) |
| JR NC, $ N +2 | 12 / 7 | 2 | | 30 XX | | |
| JR Z, N +2 $ | 12 / 7 | 2 | | 28 XX | | |
| JR NZ $ N +2 | 12 / 7 | 2 | | 20 XX | | |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| LD I, A | 9 | 2 |------| ED 47 | Load * | dst = src |
| LD R, A | 9 | 2 | | ED 4E | | |
| LD A, I | 9 | 2 | ** 0 * 0 - | ED 57 | Load * | dst = src |
| LD A, R | 9 | 2 | | ED 5F | | |
| LD A, r | 4 | 1 |------| rb 78 + | Load (8-bit) | dst = src |
| LD A, N | 7 | 2 | | 3E XX | | |
| LD A, (BC) | 7 | 1 | | 0A | | |
| LD A, (DE) | 7 | 1 | | 1A | | |
| LD A, (HL) | 7 | 1 | | 7E | | |
| LD A, (IX + N) | 19 | 3 | | DD 7E XX | | |
| LD A, (IY + N) | 19 | 3 | | FD 7E XX | | |
| LD A, (NN) | 13 | 3 | | 3A XX XX | | |
| LD B, r | 4 | 1 | | 40 + rb | | |
| LD B, N | 7 | 2 | | 06 XX | | |
| LD B, (HL) | 7 | 1 | | 46 | | |
| LD B, (IX + N) | 19 | 3 | | DD 46 XX | | |
| LD B, (IY + N) | 19 | 3 | | FD 46 XX | | |
| LD C, r | 4 | 1 | | 48 + rb | | |
| LD C, N | 7 | 2 | | 0E XX | | |
| LD C, (HL) | 7 | 1 | | 4E | | |
| LD C, (IX + N) | 19 | 3 | | DD 4E XX | | |
| LD C (IY + N) | 19 | 3 | | FD 4E XX | | |
| LD D, r | 4 | 1 | | 50 + rb | | |
| LD D, N | 7 | 2 | | 16 XX | | |
| LD D, (HL) | 7 | 1 | | 56 | | |
| LD D, (IX + N) | 19 | 3 | | DD 56 XX | | |
| LD D, (IY + N) | 19 | 3 | | FD 56 XX | | |
| LD E, r | 4 | 1 | | 58 + rb | | |
| LD E, N | 7 | 2 | | 1E XX | | |
| LD E, (HL) | 7 | 1 | | 5E | | |
| LD E, (IX + N) | 19 | 3 | | DD 5E XX | | |
| LD E, (IY + N) | 19 | 3 | | FD 5E XX | | |
| LD H, r | 4 | 1 | | 60 + rb | | |
| LD H, N | 7 | 2 | | 26 XX | | |
| LD H, (HL) | 7 | 1 | | 66 | | |
| LD H, (IX + N) | 19 | 3 | | DD 66 XX | | |
| LD H, (IY + N) | 19 | 3 | | FD 66 XX | | |
| LD L, r | 4 | 1 | | 68 + rb | | |
| LD L, N | 7 | 2 | | 2E XX | | |
| LD L, (HL) | 7 | 1 | | 6E | | |
| LD L, (IX + N) | 19 | 3 | | DD 6E XX | | |
| LD L, (IY + N) | 19 | 3 | | FD 6E XX | | |
| LD BC, (NN) | 20 | 4 |------| ED 4B XX XX | Load (16-bit) | dst = src |
| LD BC, NN | 10 | 3 | | 01 XX XX | | |
| LD DE, (NN) | 20 | 4 | | ED 5B XX XX | | |
| LD DE, NN | 10 | 3 | | 11 XX XX | | |
| LD HL, (NN) | 20 | 3 | | 2A XX XX | | |
| LD HL, NN | 10 | 3 | | 21 XX XX | | |
| LD SP, (NN) | 20 | 4 | | ED 7B XX XX | | |
| SP LD, HL | 6 | 1 | | F9 | | |
| SP LD, IX | 10 | 2 | | DD F9 | | |
| SP LD, IY | 10 | 2 | | FD F9 | | |
| SP LD, NN | 10 | 3 | | 31 XX XX | | |
| LD IX (NN) | 20 | 4 | | DD 2A XX XX | | |
| LD IX, NN | 14 | 4 | | DD 21 XX XX | | |
| LD IY, (NN) | 20 | 4 | | FD 2A XX XX | | |
| LD IY, NN | 14 | 4 | | FD 21 XX XX | | |
| LD (HL), r | 7 | 1 |------| rb 70 + | Load (Indirect) | dst = src |
| LD (HL), N | 10 | 2 | | 36 XX | | |
| LD (BC), A | 7 | 1 | | 02 | | |
| LD (DE), A | 7 | 1 | | 12 | | |
| LD (NN), A | 13 | 3 | | 32 XX XX | | |
| LD (NN), BC | 20 | 4 | | ED 43 XX XX | | |
| LD (NN), | 20 | 4 | | ED 53 XX XX | | |
| LD (NN), HL | 16 | 3 | | 22 XX XX | | |
| LD (NN), IX | 20 | 4 | | DD 22 XX XX | | |
| LD (NN), IY | 20 | 4 | | FD 22 XX XX | | |
| LD (NN), SP | 20 | 4 | | ED 73 XX XX | | |
| LD (IX + N), r | 19 | 3 | | DD 70 + rb XX | | |
| LD (IX + N), N | 19 | 4 | | DD 36 XX XX | | |
| LD (IY + N), r | 19 | 3 | | FD 70 + rb XX | | |
| LD (IY + N), N | 19 | 4 | | FD 36 XX XX | | |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| LDD | 16 | 2 | - 0 * 0 - | ED A8 | Load and Decrement | (DE) = (HL), HL = HL-1, # |
| LDDR | 21 / 1 | 2 | - 000 - | ED B8 | Load, Dec., Repeat | LDD till BC = 0 |
| IG | 16 | 2 | - 0 * 0 - | ED A0 | Load and Increment | (DE) = (HL), HL HL = +1, # |
| LDIR | 21 / 1 | 2 | - 000 - | ED B0 | Load, Inc., Repeat | IG till BC = 0 |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| NEG | 8 | 2 | *** V1 * | ED 44 | Negate | =- A |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| NOP | 4 | 1 |------| 00 | No Operation | |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| OR r | 4 | 1 | *** P00 | rb B0 + | Logical inclusive OR | Avs A = |
| OR N | 7 | 2 | | F6 XX | | |
| OR (HL) | 7 | 1 | | B6 | | |
| OR (IX + N) | 19 | 3 | | DD B6 XX | | |
| OR (IY + N) | 19 | 3 | | FD B6 XX | | |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| OUT (N), A | 11 | 2 |------| D3 XX | Output | (n) = A |
| OUT (C), 0 | 12 | 2 |------| ED 71 | Output * | (Unsupported) |
| OUT (C), A | 12 | 2 |------| ED 79 | Output | (C) = r |
| OUT (C), B | 12 | 2 | | ED 41 | | |
| OUT (C), C | 12 | 2 | | ED 49 | | |
| OUT (C), D | 12 | 2 | | ED 51 | | |
| OUT (C), E | 12 | 2 | | ED 59 | | |
| OUT (C), H | 12 | 2 | | ED 61 | | |
| OUT (C), L | 12 | 2 | | ED 69 | | |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| OUTD | 16 | 2 |?*?? 1 - | ED AB | Output and Decrement | (C) = (HL), HL = HL-1, B = B-1 |
| OTDR | 21 / 1 | 2 |? 1? 1 - | ED BB | Output, Dec., Repeat | OUTD till B = 0 |
| OUTI | 16 | 2 |?*?? 1 - | ED A3 | Output and Increment | (C) = (HL), HL HL = +1, B = B-1 |
| OTIR | 21 / 1 | 2 |? 1? 1 - | ED B3 | Output, Inc., Repeat | OUTI till B = 0 |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| POP AF | 10 | 1 |------| F1 | Pop | = qq (SP) + |
| POP BC | 10 | 1 | | C1 | | |
| POP DE | 10 | 1 | | D1 | | |
| POP HL | 10 | 1 | | E1 | | |
| POP IX | 14 | 2 |------| DD E1 | Pop | xx = (SP) + |
| POP IY | 14 | 2 | | FD E1 | | |
| PUSH AF | 11 | 1 |------| F5 | Push | - (SP) = qq |
| PUSH BC | 11 | 1 | | C5 | | |
| PUSH FOR | 11 | 1 | | D5 | | |
| PUSH HL | 11 | 1 | | E5 | | |
| PUSH IX | 15 | 2 |------| DD E5 | Push | - (SP) = xx |
| PUSH IY | 15 | 2 | | FD E5 | | |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| RES b, r | 8 | 2 |------| CB 80 +8 * b + rb | Reset bit | & m = m ^ 2 ~ (b) |
| B RES, (HL) | 15 | 2 |------| CB 86 +8 * b | | |
| B RES, (IX + N) | 23 | 4 |------| DD CB XX 86 +8 * b | |
| B RES, (IY + N) | 23 | 4 |------| FD BC XX 86 +8 * b | |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| RET | 10 | 1 |------| C9 | Return | PC = (SP) + |
| RET C | 11 / 5 | 1 |------| D8 | Conditional Return | If Carry = 1 |
| RET NC | 11 / 5 | 1 | | D0 | | If Carry = 0 |
| RET M | 11 / 5 | 1 | | F8 | | If Sign = 1 (negative) |
| RET P | 11 / 5 | 1 | | F0 | | If Sign = 0 (positive) |
| RET Z | 11 / 5 | 1 | | C8 | | If Zero = 1 (ans. = 0) |
| RET NZ | 11 / 5 | 1 | | C0 | | If Zero = 0 (non-zero) |
| RET OP | 11 / 5 | 1 | | E8 | | If Parity = 1 (even) |
| RET PO | 11 / 5 | 1 | | E0 | | If Parity = 0 (odd) |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| RETI | 14 | 2 |------| ED 4D | Return from Interrupt | PC = (SP) + |
| RETN | 14 | 2 |------| ED 45 | Return from NMI | PC = (SP) + |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| RLA | 4 | 1 | - 0-0 * | 17 | Rotate Left Acc. | = (CY, A) <- |
| RL r | 8 | 2 | ** 0P0 * | CB 10 + rb | Rotate Left | (m = CY, m) <- |
| RL (HL) | 15 | 2 | | CB 16 | | |
| RL (IX + N) | 23 | 4 | | XX CB 16 DD | | |
| RL (IY + N) | 23 | 4 | | FD 16 BC XX | | |
| RLCA | 4 | 1 | - 0-0 * | 07 | Rotate Left Cir. Acc. | A = A <- |
| RLC r | 8 | 2 | ** 0P0 * | CB 00 + rb | Rotate Left Circular | m = m <- |
| RLC (HL) | 15 | 2 | | CB 06 | | |
| RLC (IX + N) | 23 | 4 | | XX CB 06 DD | | |
| RLC (IY + N) | 23 | 4 | | FD 06 BC XX | | |
| DRC | 18 | 2 | **-0P0 | ED 6F | Rotate Left 4 bits | (A, (HL)) = (A) (HL) <- # # |
| RRA | 4 | 1 | - 0-0 * | 1F | Rotate Right Acc. | A =-> (CY, A) |
| RR r | 8 | 2 | ** 0P0 * | CB 18 + rb | Rotate Right | m =-> (CY, m) |
| RR (HL) | 15 | 2 | | CB 1E | | |
| RR (IX + N) | 23 | 4 | | DD CB 1E XX | | |
| RR (IY + N) | 23 | 4 | | FD CB 1E XX | | |
| RRCA | 4 | 1 | - 0-0 * | 0F | Rotate Right Cir.Acc. | =-> |
| R RRC | 8 | 2 | ** 0P0 * | CB 08 + rb | Rotate Right Circular | m =-> m |
| RRC (HL) | 15 | 2 | | CB 0E | | |
| RRC (IX + N) | 23 | 4 | | DD CB 0E XX | | |
| RRC (IY + N) | 23 | 4 | | FD CB 0E XX | | |
| DRP | 18 | 2 | **-0P0 | ED 67 | Rotate Right 4 bits | (A (HL )}=->{ A, (HL)) # # |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| RST 0 | 11 | 1 |------| C7 | Restart | (p = 0H, 8H, 10H ,..., 38H) |
| RST 08H | 11 | 1 | | CF | | |
| RST 10H | 11 | 1 | | D7 | | |
| RST 18H | 11 | 1 | | DF | | |
| RST 20H | 11 | 1 | | E7 | | |
| RST 28H | 11 | 1 | | EF | | |
| RST 30H | 11 | 1 | | F7 | | |
| RST 38H | 11 | 1 | | FF | | |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| R SBC | 4 | 1 | *** V1 * | 98 + rb | Subtract with Carry | = As-CY |
| SBC A, N | 7 | 2 | | OF XX | | |
| SBC (HL) | 7 | 1 | | 9E | | |
| SBC A, (IX + N) | 19 | 3 | | DD 9E XX | | |
| SBC A, (IY + N) | 19 | 3 | | FD 9E XX | | |
| SBC HL, BC | 15 | 2 | **? V1 * | ED 42 | Subtract with Carry | HL = HL-ss-CY |
| SBC HL, | 15 | 2 | | ED 52 | | |
| SBC HL, HL | 15 | 2 | | ED 62 | | |
| SBC HL, SP | 15 | 2 | | ED 72 | | |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| CWS | 4 | 1 | - 0-01 | 37 | Set Carry Flag | CY = 1 |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| SET b, r | 8 | 2 |------| CB C0 * b + +8 rb | Set bit | m = mv ^ 2 (b) |
| SET b, (HL) | 15 | 2 | | CB C6 +8 * b | | |
| SET b, (IX + N) | 23 | 4 | | XX DD CB C6 +8 * b | |
| SET b, (IY + N) | 23 | 4 | | XX FD CB C6 +8 * b | |
+-------------+----+---+------+------------+------ ---------------+----------------------+
| SLA r | 8 | 2 | ** 0P0 * | CB 20 + rb | Shift Left Arithmetic | m = m * 2 |
| SLA (HL) | 15 | 2 | | CB 26 | | |
| SLA (IX + N) | 23 | 4 | | XX CB 26 DD | | |
| SLA (IY + N) | 23 | 4 | | FD 26 BC XX | | |
| R SRA | 8 | 2 | ** 0P0 * | CB 28 + rb | Shift Right Arith. | M = m / 2 |
| SRA (HL) | 15 | 2 | | CB 2E | | |
|SRA (IX+N) | 23 | 4 | |DD CB XX 2E | | |
|SRA (IY+N) | 23 | 4 | |FD CB XX 2E | | |
+-------------+----+---+------+------------+------ ---------------+----------------------+
|SLL r | 8 | 2 |**0P0*|CB 30+rb |Shift Left Logical* |m={0,m,CY}<- |
|SLL (HL) | 15 | 2 | |CB 36 | | (SLL instructions |
|SLL (IX+N) | 23 | 4 | |DD CB XX 36 | | are Unsupported) |
|SLL (IY+N) | 23 | 4 | |FD CB XX 36 | | |
|SRL r | 8 | 2 |**0P0*|CB 38+rb |Shift Right Logical |m=->{0,m,CY} |
|SRL (HL) | 15 | 2 | |CB 3E | | |
|SRL (IX+N) | 23 | 4 | |DD CB XX 3E | | |
|SRL (IY+N) | 23 | 4 | |FD CB XX 3E | | |
+-------------+----+---+------+------------+------ ---------------+----------------------+
|SUB r | 4 | 1 |***V1*|90+rb |Subtract |A=As |
|SUB N | 7 | 2 | |D6 XX | | |
|SUB (HL) | 7 | 1 | |96 | | |
|SUB (IX+N) | 19 | 3 | |DD 96 XX | | |
|SUB (IY+N) | 19 | 3 | |FD 96 XX | | |
+-------------+----+---+------+------------+------ ---------------+----------------------+
|XOR r | 4 | 1 |***P00|A8+rb |Logical Exclusive OR |A=Axs |
|XOR N | 7 | 2 | |EE XX | | |
|XOR (HL) | 7 | 1 | |AE | | |
|XOR (IX+N) | 19 | 3 | |DD AE XX | | |
|XOR (IY+N) | 19 | 3 | |FD AE XX | | |
-------------+----+---+------+------------+------- --------------+----------------------
Clck = The time it takes to execute the instruction in CPU cycles.
Siz = How many bytes the instruction takes up in a program.
SZHPNC = How the different bits of the Flag byte (the F in the AF register) are
affected. Check the graph below this for more.
OP-Code = The instruction's equivalent in hexadecimal.
r means register. It can be A,B,C,D,E,H, or L. Add this to last byte of OP-code: Reg regbits A = 7 B = 0 C = 1 D = 2 E = 3 H = 4 L = 5 ((HL) = 6 ) In "LD (IX+N),r" and "LD (IY+N),r" you add these to the byte _Before_ the last.
b means bit. It can be 0-7. Increase the last byte of the OP-code with 8*b. Used in SET, BIT and RES.
If there are two numbers given for Clock, then the highest is when the jump is taken, the lowest is when it skips the jump.
* For unsupported instructions, use the hexadecimal
OP-Codes with the assembler instruction ".db "
EX: SLL (HL) ; instead of this, use the below
.db $CB,$36
-------+-------+---------------------------------- -----------
| F | -*01? |Flag unaffected/affected/reset/set/unknown |
| S | S |Sign flag (Bit 7) |
| Z | Z |Zero flag (Bit 6) |
| HC | H |Half Carry flag (Bit 4) |
| P/V | P |Parity/Overflow flag (Bit 2, V=overflow) |
| N | N |Add/Subtract flag (Bit 1) |
| CY | C|Carry flag (Bit 0) |
+---------------+--------------------------------- ------------+
| n |Immediate addressing |
| nn |Immediate extended addressing |
| e |Relative addressing (PC=PC+2+offset) |
| (nn) |Extended addressing |
| (xx+d) |Indexed addressing |
| r |Register addressing |
| (rr) |Register indirect addressing |
| |Implied addressing |
| b |Bit addressing |
| p |Modified page zero addressing (see RST) |
+---------------+--------------------------------- ------------+
| ABCDE |Registers (8-bit) |
| AF BC DE HL |Register pairs (16-bit) |
| F |Flag register (8-bit) |
| I |Interrupt page address register (8-bit) |
| IX IY |Index registers (16-bit) |
| PC |Program Counter register (16-bit) |
| R |Memory Refresh register |
| SP |Stack Pointer register (16-bit) |
+---------------+--------------------------------- ------------+
| b |One bit (0 to 7) |
| cc |Condition (C,M,NC,NZ,P,PE,PO,Z) |
| d |One-byte expression (-128 to +127) |
| dst |Destination s, ss, (BC), (DE), (HL), (nn) |
| e |One-byte expression (-126 to +129) |
| m |Any register r, (HL) or (xx+d) |
| n |One-byte expression (0 to 255) |
| nn |Two-byte expression (0 to 65535) |
| pp |Register pair BC, DE, IX or SP |
| qq |Register pair AF, BC, DE or HL |
| qq' |Alternative register pair AF, BC, DE or HL |
| r |Register A, B, C, D, E, H or L |
| rr |Register pair BC, DE, IY or SP |
| s |Any register r, value n, (HL) or (xx+d) |
| src |Source s, ss, (BC), (DE), (HL), nn, (nn) |
| ss |Register pair BC, DE, HL or SP |
| xx |Index register IX or IY |
+---------------+--------------------------------- ------------+
| + - * / ^ |Add/subtract/multiply/divide/exponent |
| & ~ vx |Logical AND/NOT/inclusive OR/exclusive OR |
| <- -> |Rotate left/right |
| ( ) |Indirect addressing |
| ( )+ -( ) |Indirect addressing auto-increment/decrement |
| { } |Combination of operands |
| # |Also BC=BC-1,DE=DE-1 |
| ## |Only lower 4 bits of accumulator A used |
---------------+---------------------------------- -----------
