127 lines
4.8 KiB
Markdown
127 lines
4.8 KiB
Markdown
# Instruction Encodings
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| Mnemonic | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
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|r8 | | | x | x | x | | | |
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|r8(alt) | | | | | | x | x | x |
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|r16 | | | x | x | | | | |
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|r16stk | | | x | x | | | | |
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|r16mem | | | x | x | | | | |
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|cond | | | | x | x | | | |
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|b3 | | | x | x | x | | | |
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|tgt3 | | | x | x | x | | | |
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|u8 | | | | | | | | |
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|imm16 | | | | | | | | |
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# Block 1 : Uncategorized
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7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic
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| | | | | | | | `nop`
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| | | 1 | 1 | | | | `jr u8`
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| | 1 | C | C | | | | `jr cond(C), u8`
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7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic
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| | | | 1 | | | |
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# Block 1: 8-bit r2r loads
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7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic
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| 1 | 1 | 1 | | 1 | 1 | | `halt`
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| 1 | D | D | D | S | S | S | `ld rD, rS`
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# Block 2: 8-bit arithmetic
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7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic
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1 | | | | |`R`|`R`|`R`| `add a, R`
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1 | | | | 1 |`R`|`R`|`R`| `adc a, R`
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1 | | | 1 | |`R`|`R`|`R`| `sub a, R`
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1 | | | 1 | 1 |`R`|`R`|`R`| `sbc a, R`
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1 | | 1 | | |`R`|`R`|`R`| `and a, R`
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1 | | 1 | | 1 |`R`|`R`|`R`| `or a, R`
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1 | | 1 | 1 | |`R`|`R`|`R`| `xor a, R`
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1 | | 1 | 1 | 1 |`R`|`R`|`R`| `cp a, R`
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# Block 3: Etc.
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## Table 0
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7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic
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1 | 1 | | C | C | | | | `ret cond(C)`
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1 | 1 | 1 | | | | | | `ldh [ff00 + u8], a`
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1 | 1 | 1 | | 1 | | | | `add sp, u8`
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1 | 1 | 1 | 1 | | | | | `ldh a, [ff00 + u8]`
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1 | 1 | 1 | 1 | 1 | | | | `ldh HL, [c]`
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## Table 1
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7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic
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1 | 1 |`R`|`R`| | | | 1 | `pop r16stk(R)`
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1 | 1 | | | 1 | | | 1 | `ret`
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1 | 1 | | 1 | 1 | | | 1 | `reti`
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1 | 1 | 1 | | 1 | | | 1 | `jp hl`
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1 | 1 | 1 | 1 | 1 | | | 1 | `ld sp, hl`
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## Table 2
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7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic
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1 | 1 | |`C`|`C`| | 1 | | `jp cond(C), imm16`
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1 | 1 | 1 | | | | 1 | | `ld [c], a`
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1 | 1 | 1 | | 1 | | 1 | | `ld [imm16], a`
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1 | 1 | 1 | 1 | | | 1 | | `ld a, [c]`
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1 | 1 | 1 | 1 | 1 | | 1 | | `ld a, [imm16]`
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## Table 3
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7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic
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1 | 1 | | | | | 1 | 1 | `jp imm16`
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1 | 1 | | | 1 | | 1 | 1 | Prefix xCB
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| | | | | | | | ... Invalid (No opcode fetch)
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1 | 1 | 1 | 1 | | | 1 | 1 | `di`
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1 | 1 | 1 | 1 | 1 | | 1 | 1 | `ei`
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## Table 4
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7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic
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1 | 1 | |`C`|`C`| 1 | | | `call cond(C), imm16`
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1 | 1 | 1 | X | Y | 1 | | | Invalid (No opcode fetch)
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## Table 5
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7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic
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1 | 1 |`R`|`R`| | 1 | | 1 | `push r16stk(R)`
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1 | 1 | | | 1 | 1 | | 1 | `call imm16`
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1 | 1 | X | Y | 1 | 1 | | 1 | if X | Y: Invalid (No opcode fetch)
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## Table 6: Arithmetic with 8-bit immediate
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7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic
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1 | 1 | | | | 1 | 1 | | `add a, u8`
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1 | 1 | | | 1 | 1 | 1 | | `adc a, u8`
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1 | 1 | | 1 | | 1 | 1 | | `sub a, u8`
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1 | 1 | | 1 | 1 | 1 | 1 | | `sbc a, u8`
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1 | 1 | 1 | | | 1 | 1 | | `and a, u8`
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1 | 1 | 1 | | 1 | 1 | 1 | | `xor a, u8`
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1 | 1 | 1 | 1 | | 1 | 1 | | `or a, u8`
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1 | 1 | 1 | 1 | 1 | 1 | 1 | | `cp a, u8`
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## Table 7: Reset vectors
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7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic
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1 | 1 |`T`|`T`|`T`| 1 | 1 | 1 | `rst (T * 8)`
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# CB-prefix instructions:
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7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic
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| | | | | R | R | R | `rlc R`
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| | | | 1 | R | R | R | `rrc R`
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| | | 1 | | R | R | R | `rl R`
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| | | 1 | 1 | R | R | R | `rr R`
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| | 1 | | | R | R | R | `sla R`
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| | 1 | | 1 | R | R | R | `sra R`
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| | 1 | 1 | | R | R | R | `swap R`
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| | 1 | 1 | 1 | R | R | R | `srl R`
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7 | 6 | 5 | 4 | 3 | 2 | 1 | | Mnemonic
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| 1 | i | i | i | R | R | R | `bit i, R`
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1 | | i | i | i | R | R | R | `res i, R`
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1 | 1 | i | i | i | R | R | R | `set i, R`
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