Difference between revisions of "User:CoBB"
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== Z80 instruction set == | == Z80 instruction set == | ||
=== Reference === | === Reference === | ||
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! Instruction !! Opcode !! Time !! S !! Z !! X !! H !! Y !! P !! N !! C !! Effect | ! Instruction !! Opcode !! Time !! S !! Z !! X !! H !! Y !! P !! N !! C !! Effect | ||
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=== Legend === | === Legend === | ||
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! Notation !! Meaning !! Respective opcode bits | ! Notation !! Meaning !! Respective opcode bits | ||
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Revision as of 00:20, 26 February 2006
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Z80 instruction set
Reference
| Instruction | Opcode | Time | S | Z | X | H | Y | P | N | C | Effect |
|---|---|---|---|---|---|---|---|---|---|---|---|
| adc a,R | 10001rrr | 4 | + | + | + | + | + | V | 0 | + | a += R + cf |
| adc a,N | 11001110 nnnnnnnn | 7 | + | + | + | + | + | V | 0 | + | a += N + cf |
| adc a,(hl) | 10001110 | 7 | + | + | + | + | + | V | 0 | + | a += (hl) + cf |
| adc a,(ix+D) | 11011101 10001110 dddddddd | 19 | + | + | + | + | + | V | 0 | + | a += (ix+D) + cf |
| adc a,(iy+D) | 11111101 10001110 dddddddd | 19 | + | + | + | + | + | V | 0 | + | a += (iy+D) + cf |
| adc hl,Q | 11101101 01qq1010 | 15 | + | + | + | + | + | V | 0 | + | hl += Q + cf |
| add a,R | 10000rrr | 4 | + | + | + | + | + | V | 0 | + | a += R |
| add a,N | 11000110 nnnnnnnn | 7 | + | + | + | + | + | V | 0 | + | a += N |
| add a,(hl) | 10000110 | 7 | + | + | + | + | + | V | 0 | + | a += (hl) |
| add a,(ix+D) | 11011101 10000110 dddddddd | 19 | + | + | + | + | + | V | 0 | + | a += (ix+D) |
| add a,(iy+D) | 11111101 10000110 dddddddd | 19 | + | + | + | + | + | V | 0 | + | a += (iy+D) |
| add hl,Q | 00qq1001 | 11 | - | - | + | + | + | - | 0 | + | hl += Q |
| add ix,Q | 11011101 00qq1001 | 15 | - | - | + | + | + | - | 0 | + | ix += Q |
| add iy,Q | 11111101 00qq1001 | 15 | - | - | + | + | + | - | 0 | + | iy += Q |
| call A | 11001101 alalalal ahahahah | 17 | - | - | - | - | - | - | - | - | sp -= 2, (sp) := pc, pc := A |
| ccf | 00111111 | 4 | - | - | A | X | A | - | 0 | X | hf := cf, cf := ~cf |
| ld R1,R2 | 01rrrsss | 4 | - | - | - | - | - | - | - | - | R1 := R2 |
| pop P | 11pp0001 | 10 | - | - | - | - | - | - | - | - | P := (sp), sp += 2 |
| push P | 11pp0101 | 11 | - | - | - | - | - | - | - | - | sp -= 2, (sp) := P |
| ret | 11001001 | 10 | - | - | - | - | - | - | - | - | pc := (sp), sp += 2 |
Legend
| Notation | Meaning | Respective opcode bits |
|---|---|---|
| A | 16-bit address | alalalal ahahahah |
| D | 8-bit signed relative offset | dddddddd |
| N | 8-bit immediate | nnnnnnnn |
| P | 16-bit register pair: bc, de, hl, af | pp = 00, 01, 10, 11 |
| Q | 16-bit register: bc, de, hl, sp | qq = 00, 01, 10, 11 |
| R | 8-bit general purpose register: a, b, c, d, e, h, l | rrr (or sss) = 111, 000, 001, 010, 011, 100, 101 |
Flags
- - = no change
- + = change by definition:
- S = sign, bit 7 of the result byte (accumulator or high byte for 16-bit operations)
- Z = zero, set if the result is zero (8 or 16-bit value)
- X = undocumented, bit 5 of the result byte
- H = half-carry, the carry of the low nibble of the result byte
- Y = undocumented, bit 3 of the result byte
- P = parity (set if the result byte has an even number of bits set) or overflow (set when crossing the boundary of the signed range); always specified
- N = negative, set if the previous operation was a subtraction; always specified
- C = carry, the theoretical bit 8 of the result byte
- 0 = always reset
- 1 = always set
- X = change described under Effect
- P = parity (only for the parity flag)
- V = overflow (only for the parity flag)
- A = OR with the respective bit of the accumulator
