# Instruction Encodings
| Mnemonic   | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|------------|---|---|---|---|---|---|---|---|
|r8          |   |   | x | x | x |   |   |   |
|r8(alt)     |   |   |   |   |   | x | x | x |
|r16         |   |   | x | x |   |   |   |   |
|r16stk      |   |   | x | x |   |   |   |   |
|r16mem      |   |   | x | x |   |   |   |   |
|cond        |   |   |   | x | x |   |   |   |
|b3          |   |   | x | x | x |   |   |   |
|tgt3        |   |   | x | x | x |   |   |   |
|u8          |   |   |   |   |   |   |   |   |
|imm16       |   |   |   |   |   |   |   |   |

# Block 1 : Uncategorized
 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic
---|---|---|---|---|---|---|---|----------
   |   |   |   |   |   |   |   | `nop`
   |   |   | 1 | 1 |   |   |   | `jr u8`
   |   | 1 | C | C |   |   |   | `jr cond(C), u8`

 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic
---|---|---|---|---|---|---|---|----------
   |   |   |   | 1 |   |   |   |
   |   |   | 1 |   |   |   |   | 
   |   |   | 1 | 1 |   |   |   | 
   |   | 1 |   |   |   |   |   | 
   |   | 1 |   | 1 |   |   |   | 
   |   | 1 | 1 |   |   |   |   | 
   |   | 1 | 1 | 1 |   |   |   | 

# Block 1: 8-bit r2r loads
 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic
---|---|---|---|---|---|---|---|----------
   | 1 | 1 | 1 |   | 1 | 1 |   | `halt`
   | 1 | D | D | D | S | S | S | `ld rD, rS`

# Block 2: 8-bit arithmetic
 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic
---|---|---|---|---|---|---|---|----------
 1 |   |   |   |   |`R`|`R`|`R`| `add a, R`
 1 |   |   |   | 1 |`R`|`R`|`R`| `adc a, R`
 1 |   |   | 1 |   |`R`|`R`|`R`| `sub a, R`
 1 |   |   | 1 | 1 |`R`|`R`|`R`| `sbc a, R`
 1 |   | 1 |   |   |`R`|`R`|`R`| `and a, R`
 1 |   | 1 |   | 1 |`R`|`R`|`R`| `or  a, R`
 1 |   | 1 | 1 |   |`R`|`R`|`R`| `xor a, R`
 1 |   | 1 | 1 | 1 |`R`|`R`|`R`| `cp  a, R`

# Block 3: Etc.
## Table 0
 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic
---|---|---|---|---|---|---|---|----------
 1 | 1 |   | C | C |   |   |   | `ret cond(C)`
 1 | 1 | 1 |   |   |   |   |   | `ldh [ff00 + u8], a`
 1 | 1 | 1 |   | 1 |   |   |   | `add sp, u8`
 1 | 1 | 1 | 1 |   |   |   |   | `ldh a, [ff00 + u8]`
 1 | 1 | 1 | 1 | 1 |   |   |   | `ldh HL, [c]`
## Table 1
 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic
---|---|---|---|---|---|---|---|----------
 1 | 1 |`R`|`R`|   |   |   | 1 | `pop r16stk(R)`
 1 | 1 |   |   | 1 |   |   | 1 | `ret`
 1 | 1 |   | 1 | 1 |   |   | 1 | `reti`
 1 | 1 | 1 |   | 1 |   |   | 1 | `jp hl`
 1 | 1 | 1 | 1 | 1 |   |   | 1 | `ld sp, hl`
## Table 2
 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic
---|---|---|---|---|---|---|---|----------
 1 | 1 |   |`C`|`C`|   | 1 |   | `jp cond(C), imm16`
 1 | 1 | 1 |   |   |   | 1 |   | `ld [c], a`
 1 | 1 | 1 |   | 1 |   | 1 |   | `ld [imm16], a`
 1 | 1 | 1 | 1 |   |   | 1 |   | `ld a, [c]`
 1 | 1 | 1 | 1 | 1 |   | 1 |   | `ld a, [imm16]`
## Table 3
 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic
---|---|---|---|---|---|---|---|----------
 1 | 1 |   |   |   |   | 1 | 1 | `jp imm16`
 1 | 1 |   |   | 1 |   | 1 | 1 | Prefix  xCB
   |   |   |   |   |   |   |   | ... Invalid (No opcode fetch)
 1 | 1 | 1 | 1 |   |   | 1 | 1 | `di`
 1 | 1 | 1 | 1 | 1 |   | 1 | 1 | `ei`
## Table 4
 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic
---|---|---|---|---|---|---|---|----------
 1 | 1 |   |`C`|`C`| 1 |   |   | `call cond(C), imm16`
 1 | 1 | 1 | X | Y | 1 |   |   | Invalid (No opcode fetch)
## Table 5
 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic
---|---|---|---|---|---|---|---|----------
 1 | 1 |`R`|`R`|   | 1 |   | 1 | `push r16stk(R)`
 1 | 1 |   |   | 1 | 1 |   | 1 | `call imm16`
 1 | 1 | X | Y | 1 | 1 |   | 1 | if X | Y: Invalid (No opcode fetch)
## Table 6: Arithmetic with 8-bit immediate
 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic
---|---|---|---|---|---|---|---|----------
 1 | 1 |   |   |   | 1 | 1 |   | `add a, u8`
 1 | 1 |   |   | 1 | 1 | 1 |   | `adc a, u8`
 1 | 1 |   | 1 |   | 1 | 1 |   | `sub a, u8`
 1 | 1 |   | 1 | 1 | 1 | 1 |   | `sbc a, u8`
 1 | 1 | 1 |   |   | 1 | 1 |   | `and a, u8`
 1 | 1 | 1 |   | 1 | 1 | 1 |   | `xor a, u8`
 1 | 1 | 1 | 1 |   | 1 | 1 |   | `or  a, u8`
 1 | 1 | 1 | 1 | 1 | 1 | 1 |   | `cp  a, u8`
## Table 7: Reset vectors
 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic
---|---|---|---|---|---|---|---|----------
 1 | 1 |`T`|`T`|`T`| 1 | 1 | 1 | `rst (T * 8)`

# CB-prefix instructions:
 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic
---|---|---|---|---|---|---|---|----------
   |   |   |   |   | R | R | R | `rlc  R`
   |   |   |   | 1 | R | R | R | `rrc  R`
   |   |   | 1 |   | R | R | R | `rl   R`
   |   |   | 1 | 1 | R | R | R | `rr   R`
   |   | 1 |   |   | R | R | R | `sla  R`
   |   | 1 |   | 1 | R | R | R | `sra  R`
   |   | 1 | 1 |   | R | R | R | `swap R`
   |   | 1 | 1 | 1 | R | R | R | `srl  R`

 7 | 6 | 5 | 4 | 3 | 2 | 1 |   | Mnemonic
---|---|---|---|---|---|---|---|----------
   | 1 | i | i | i | R | R | R | `bit i, R`
 1 |   | i | i | i | R | R | R | `res i, R`
 1 | 1 | i | i | i | R | R | R | `set i, R`