4.8 KiB
4.8 KiB
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 |
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| 1 | 1 | jr u8 |
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| 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 |
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| 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 |
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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 |
Block 3: Etc.
Table 0
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic |
|---|---|---|---|---|---|---|---|---|
| 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] |
Table 1
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic |
|---|---|---|---|---|---|---|---|---|
| 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 |
Table 2
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic |
|---|---|---|---|---|---|---|---|---|
| 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] |
Table 3
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic |
|---|---|---|---|---|---|---|---|---|
| 1 | 1 | 1 | 1 | jp imm16 |
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| 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 |
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| 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) |
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| 1 | 1 | 1 | 1 | 1 | call imm16 |
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| 1 | 1 | X | Y | 1 | 1 | 1 | if X |
Table 6: Arithmetic with 8-bit immediate
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Mnemonic |
|---|---|---|---|---|---|---|---|---|
| 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 |
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 |
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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 |
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | Mnemonic | |
|---|---|---|---|---|---|---|---|---|
| 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 |