Difference between revisions of "User:CoBB"
From WikiTI
(→Z80 instruction set) |
(→Z80 instruction set) |
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| bit B,R || <tt>11001011 01bbbrrr</tt> || 8 || + || + || + || 1 || + || P || 0 || - || tmp := R AND [1 << B] => flags | | bit B,R || <tt>11001011 01bbbrrr</tt> || 8 || + || + || + || 1 || + || P || 0 || - || tmp := R AND [1 << B] => flags | ||
|- | |- | ||
− | | bit B,(hl) || <tt>11001011 01bbb110</tt> || 12 || + || + || | + | | bit B,(hl) || <tt>11001011 01bbb110</tt> || 12 || + || + || X || 1 || X || P || 0 || - || tmp := (hl) AND [1 << B] => flags,<br>xf := memptr.13, yf := memptr.11 |
|- | |- | ||
| bit B,(I+D) || <tt>11i11101 11001011 dddddddd 01bbb***</tt> || 20 || + || + || X || 1 || X || P || 0 || - || tmp := (I+D) AND [1 << B] => flags,<br>xf := [I+D].13, yf := [I+D].11 | | bit B,(I+D) || <tt>11i11101 11001011 dddddddd 01bbb***</tt> || 20 || + || + || X || 1 || X || P || 0 || - || tmp := (I+D) AND [1 << B] => flags,<br>xf := [I+D].13, yf := [I+D].11 | ||
Line 107: | Line 107: | ||
| halt || <tt>01110110</tt> || 4 || - || - || - || - || - || - || - || - || wait for interrupt | | halt || <tt>01110110</tt> || 4 || - || - || - || - || - || - || - || - || wait for interrupt | ||
|- | |- | ||
− | | im 0 || <tt>11101101 | + | | im 0 || <tt>11101101 01*0*110</tt> || 8 || - || - || - || - || - || - || - || - || mode 0: execute instruction on bus |
|- | |- | ||
− | | im 1 || <tt>11101101 | + | | im 1 || <tt>11101101 01*10110</tt> || 8 || - || - || - || - || - || - || - || - || mode 1: execute rst $38 |
|- | |- | ||
− | | im 2 || <tt>11101101 | + | | im 2 || <tt>11101101 01*11110</tt> || 8 || - || - || - || - || - || - || - || - || mode 2: call (i * 256 + byte on bus) |
|- | |- | ||
| in a,(N) || <tt>11011011 nnnnnnnn</tt> || 11 || - || - || - || - || - || - || - || - || a := ((N)) | | in a,(N) || <tt>11011011 nnnnnnnn</tt> || 11 || - || - || - || - || - || - || - || - || a := ((N)) | ||
Line 252: | Line 252: | ||
|- | |- | ||
| out (c),0 || <tt>11101101 01110001</tt> || 12 || - || - || - || - || - || - || - || - || ((c)) := ? (seems to vary with CPU) | | out (c),0 || <tt>11101101 01110001</tt> || 12 || - || - || - || - || - || - || - || - || ((c)) := ? (seems to vary with CPU) | ||
+ | |- | ||
+ | | outd || <tt>11101101 10101011</tt> || 16 || + || + || + || X || + || X || X || X || tmp := (hl), ((c)) := tmp, hl -= 1,<br>b -= 1 => flags, nf := tmp.7, tmp2 = tmp + l,<br>pf := parity of [[tmp2 AND 0x07] XOR b],<br>hf := cf := tmp2 > 255 | ||
+ | |- | ||
+ | | otdr || <tt>11101101 10111011</tt> || 21/16 || + || + || + || X || + || X || X || X || outd, if b <> 0 then pc -= 2 | ||
+ | |- | ||
+ | | outi || <tt>11101101 10100011</tt> || 16 || + || + || + || X || + || X || X || X || tmp := (hl), ((c)) := tmp, hl += 1,<br>b -= 1 => flags, nf := tmp.7, tmp2 = tmp + l,<br>pf := parity of [[tmp2 AND 0x07] XOR b],<br>hf := cf := tmp2 > 255 | ||
+ | |- | ||
+ | | otir || <tt>11101101 10110011</tt> || 21/16 || + || + || + || X || + || X || X || X || outi, if b <> 0 then pc -= 2 | ||
|- | |- | ||
| pop P || <tt>11pp0001</tt> || 10 || - || - || - || - || - || - || - || - || P := (sp), sp += 2 | | pop P || <tt>11pp0001</tt> || 10 || - || - || - || - || - || - || - || - || P := (sp), sp += 2 | ||
+ | |- | ||
+ | | pop I || <tt>11i11101 11100001</tt> || 14 || - || - || - || - || - || - || - || - || I := (sp), sp += 2 | ||
|- | |- | ||
| push P || <tt>11pp0101</tt> || 11 || - || - || - || - || - || - || - || - || sp -= 2, (sp) := P | | push P || <tt>11pp0101</tt> || 11 || - || - || - || - || - || - || - || - || sp -= 2, (sp) := P | ||
+ | |- | ||
+ | | push I || <tt>11i11101 11100101</tt> || 15 || - || - || - || - || - || - || - || - || sp -= 2, (sp) := I | ||
+ | |- | ||
+ | | res B,R || <tt>11001011 10bbbrrr</tt> || 8 || - || - || - || - || - || - || - || - || R := R AND ~[1 << B] | ||
+ | |- | ||
+ | | res B,(hl) || <tt>11001011 10bbb110</tt> || 15 || - || - || - || - || - || - || - || - || (hl) := (hl) AND ~[1 << B] | ||
+ | |- | ||
+ | | res B,(I+D) || <tt>11i11101 11001011 dddddddd 10bbb110</tt> || 23 || - || - || - || - || - || - || - || - || (I+D) := (I+D) AND ~[1 << B] | ||
+ | |- | ||
+ | | res B,(I+D)->R || <tt>11i11101 11001011 dddddddd 10bbbrrr</tt> || 23 || - || - || - || - || - || - || - || - || R := (I+D) := (I+D) AND ~[1 << B] | ||
|- | |- | ||
| ret || <tt>11001001</tt> || 10 || - || - || - || - || - || - || - || - || pc := (sp), sp += 2 | | ret || <tt>11001001</tt> || 10 || - || - || - || - || - || - || - || - || pc := (sp), sp += 2 | ||
+ | |- | ||
+ | | ret C || <tt>11ccc000</tt> || 11/5 || - || - || - || - || - || - || - || - || if C then pc := (sp), sp += 2 | ||
+ | |- | ||
+ | | reti || <tt>11101101 01**1101</tt> || 14 || - || - || - || - || - || - || - || - || pc := (sp), sp += 2, iff1 := iff2 | ||
+ | |- | ||
+ | | retn || <tt>11101101 01**0101</tt> || 14 || - || - || - || - || - || - || - || - || pc := (sp), sp += 2, iff1 := iff2 | ||
|} | |} | ||
Revision as of 10:47, 5 March 2006
Contents
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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,J | 11i11101 1000110b | 8 | + | + | + | + | + | V | 0 | + | a += J + cf |
adc a,N | 11001110 nnnnnnnn | 7 | + | + | + | + | + | V | 0 | + | a += N + cf |
adc a,(hl) | 10001110 | 7 | + | + | + | + | + | V | 0 | + | a += (hl) + cf |
adc a,(I+D) | 11i11101 10001110 dddddddd | 19 | + | + | + | + | + | V | 0 | + | a += (I+D) + cf |
adc hl,Q | 11101101 01qq1010 | 15 | + | + | + | + | + | V | 0 | + | hl += Q + cf |
add a,R | 10000rrr | 4 | + | + | + | + | + | V | 0 | + | a += R |
add a,J | 11i11101 1000010b | 8 | + | + | + | + | + | V | 0 | + | a += J |
add a,N | 11000110 nnnnnnnn | 7 | + | + | + | + | + | V | 0 | + | a += N |
add a,(hl) | 10000110 | 7 | + | + | + | + | + | V | 0 | + | a += (hl) |
add a,(I+D) | 11i11101 10000110 dddddddd | 19 | + | + | + | + | + | V | 0 | + | a += (I+D) |
add hl,Q | 00qq1001 | 11 | - | - | + | + | + | - | 0 | + | hl += Q |
add I,Q | 11i11101 00qq1001 | 15 | - | - | + | + | + | - | 0 | + | I += Q |
and R | 10100rrr | 4 | + | + | + | 1 | + | P | 0 | 0 | a := a AND R |
and J | 11i11101 1010010b | 8 | + | + | + | 1 | + | P | 0 | 0 | a := a AND J |
and N | 11100110 nnnnnnnn | 7 | + | + | + | 1 | + | P | 0 | 0 | a := a AND N |
and (hl) | 10100110 | 7 | + | + | + | 1 | + | P | 0 | 0 | a := a AND (hl) |
and (I+D) | 11i11101 10100110 dddddddd | 19 | + | + | + | 1 | + | P | 0 | 0 | a := a AND (I+D) |
bit B,R | 11001011 01bbbrrr | 8 | + | + | + | 1 | + | P | 0 | - | tmp := R AND [1 << B] => flags |
bit B,(hl) | 11001011 01bbb110 | 12 | + | + | X | 1 | X | P | 0 | - | tmp := (hl) AND [1 << B] => flags, xf := memptr.13, yf := memptr.11 |
bit B,(I+D) | 11i11101 11001011 dddddddd 01bbb*** | 20 | + | + | X | 1 | X | P | 0 | - | tmp := (I+D) AND [1 << B] => flags, xf := [I+D].13, yf := [I+D].11 |
call A | 11001101 alalalal ahahahah | 17 | - | - | - | - | - | - | - | - | sp -= 2, (sp) := pc, pc := A |
call C,A | 11ccc100 alalalal ahahahah | 17/10 | - | - | - | - | - | - | - | - | if C then sp -= 2, (sp) := pc, pc := A |
ccf | 00111111 | 4 | - | - | A | X | A | - | 0 | X | hf := cf, cf := ~cf |
cp R | 10111rrr | 4 | + | + | X | + | X | V | 1 | + | tmp := a - R => flags, xf := R.5, yf = R.3 |
cp J | 11i11101 1011110b | 8 | + | + | X | + | X | V | 1 | + | tmp := a - J => flags, xf := J.5, yf = J.3 |
cp N | 11111110 nnnnnnnn | 7 | + | + | X | + | X | V | 1 | + | tmp := a - N => flags, xf := N.5, yf = N.3 |
cp (hl) | 10111110 | 7 | + | + | X | + | X | V | 1 | + | tmp := a - (hl) => flags, xf := (hl).5, yf = (hl).3 |
cp (I+D) | 11i11101 10111110 dddddddd | 19 | + | + | X | + | X | V | 1 | + | tmp := a - (I+D) => flags, xf := (I+D).5, yf = (I+D).3 |
cpd | 11101101 10101001 | 16 | + | + | X | + | X | C | 1 | - | tmp := a - (hl) => flags, bc -= 1, hl -= 1, xf := [tmp - hf].1, yf = [tmp - hf].3 |
cpdr | 11101101 10111001 | 21/16 | + | + | X | + | X | C | 1 | - | cpd, if bc <> 0 and nz then pc -= 2 |
cpi | 11101101 10100001 | 16 | + | + | X | + | X | C | 1 | - | tmp := a - (hl) => flags, bc -= 1, hl += 1, xf := [tmp - hf].1, yf = [tmp - hf].3 |
cpir | 11101101 10110001 | 21/16 | + | + | X | + | X | C | 1 | - | cpi, if bc <> 0 and nz then pc -= 2 |
cpl | 00101111 | 4 | - | - | + | 1 | + | - | 1 | - | a := ~a |
daa | 00100111 | 4 | + | + | + | X | + | P | - | X | tmp := a, if nf then if hf or [a AND 0x0f > 9] then tmp -= 0x06 if cf or [a > 0x99] then tmp -= 0x60 else if hf or [a AND 0x0f > 9] then tmp += 0x06 if cf or [a > 0x99] then tmp += 0x60 endif, tmp => flags, cf := cf OR [a > 0x99], hf := a.4 XOR tmp.4, a := tmp |
dec R | 00rrr101 | 4 | + | + | + | + | + | V | 1 | - | R -= 1 |
dec J | 11i11101 0010b101 | 8 | + | + | + | + | + | V | 1 | - | J -= 1 |
dec (hl) | 00110101 | 11 | + | + | + | + | + | V | 1 | - | (hl) -= 1 |
dec (I+D) | 11i11101 00110101 dddddddd | 19 | + | + | + | + | + | V | 1 | - | (I+D) -= 1 |
dec Q | 00qq1011 | 6 | - | - | - | - | - | - | - | - | Q -= 1 |
dec I | 11i11101 00101011 | 10 | - | - | - | - | - | - | - | - | I -= 1 |
di | 11110011 | 4 | - | - | - | - | - | - | - | - | iff1 := 0, iff2 := 0 |
djnz E | 00010000 dddddddd | 13/8 | - | - | - | - | - | - | - | - | b -= 1, if b <> 0 then pc := E |
ei | 11111011 | 4 | - | - | - | - | - | - | - | - | iff1 := 1, iff2 := 1 after the next instruction |
ex (sp),hl | 11100011 | 19 | - | - | - | - | - | - | - | - | (sp) <=> hl |
ex (sp),I | 11i11101 11100011 | 23 | - | - | - | - | - | - | - | - | (sp) <=> I |
ex af,af' | 00001000 | 4 | X | X | X | X | X | X | X | X | af <=> af' |
ex de,hl | 11101011 | 4 | - | - | - | - | - | - | - | - | de <=> hl |
exx | 11011001 | 4 | - | - | - | - | - | - | - | - | bc, de, hl <=> bc', de', hl' |
halt | 01110110 | 4 | - | - | - | - | - | - | - | - | wait for interrupt |
im 0 | 11101101 01*0*110 | 8 | - | - | - | - | - | - | - | - | mode 0: execute instruction on bus |
im 1 | 11101101 01*10110 | 8 | - | - | - | - | - | - | - | - | mode 1: execute rst $38 |
im 2 | 11101101 01*11110 | 8 | - | - | - | - | - | - | - | - | mode 2: call (i * 256 + byte on bus) |
in a,(N) | 11011011 nnnnnnnn | 11 | - | - | - | - | - | - | - | - | a := ((N)) |
in R,(c) | 11101101 01rrr000 | 12 | + | + | + | 0 | + | P | 0 | - | R := ((c)) |
in f,(c) | 11101101 01110000 | 12 | + | + | + | 0 | + | P | 0 | - | ((c)) => flags |
inc R | 00rrr100 | 4 | + | + | + | + | + | V | 0 | - | R += 1 |
inc J | 11i11101 0010b100 | 8 | + | + | + | + | + | V | 0 | - | J += 1 |
inc (hl) | 00110100 | 11 | + | + | + | + | + | V | 0 | - | (hl) += 1 |
inc (I+D) | 11i11101 00110100 dddddddd | 23 | + | + | + | + | + | V | 0 | - | (I+D) += 1 |
inc Q | 00qq0011 | 6 | - | - | - | - | - | - | - | - | Q += 1 |
inc I | 11i11101 00100011 | 10 | - | - | - | - | - | - | - | - | I += 1 |
ind | 11101101 10101010 | 16 | + | + | + | X | + | X | X | X | tmp := ((c)), (hl) := tmp, hl -= 1, b -= 1 => flags, nf := tmp.7, tmp2 = tmp + [[c - 1] AND 0xff], pf := parity of [[tmp2 AND 0x07] XOR b], hf := cf := tmp2 > 255 |
indr | 11101101 10111010 | 21/16 | + | + | + | X | + | X | X | X | ind, if b <> 0 then pc -= 2 |
ini | 11101101 10100010 | 16 | + | + | + | X | + | X | X | X | tmp := ((c)), (hl) := tmp, hl += 1, b -= 1 => flags, nf := tmp.7, tmp2 := tmp + [[c + 1] AND 0xff], pf := parity of [[tmp2 AND 0x07] XOR b], hf := cf := tmp2 > 255 |
inir | 11101101 10110010 | 21/16 | + | + | + | X | + | X | X | X | ini, if b <> 0 then pc -= 2 |
jp A | 11000011 alalalal ahahahah | 10 | - | - | - | - | - | - | - | - | pc := A |
jp (hl) | 11101001 | 4 | - | - | - | - | - | - | - | - | pc := hl |
jp (I) | 11i11101 11101001 | 8 | - | - | - | - | - | - | - | - | pc := I |
jp C,A | 11ccc010 alalalal ahahahah | 10 | - | - | - | - | - | - | - | - | if C then pc := A |
jr E | 00011000 dddddddd | 12 | - | - | - | - | - | - | - | - | pc := E |
jr nz,E | 00100000 dddddddd | 12/7 | - | - | - | - | - | - | - | - | if nz then pc := E |
jr z,E | 00101000 dddddddd | 12/7 | - | - | - | - | - | - | - | - | if zf then pc := E |
jr nc,E | 00110000 dddddddd | 12/7 | - | - | - | - | - | - | - | - | if nc then pc := E |
jr c,E | 00111000 dddddddd | 12/7 | - | - | - | - | - | - | - | - | if cf then pc := E |
ld R1,R2 | 01rrrsss | 4 | - | - | - | - | - | - | - | - | R1 := R2 |
ld R,J | 11i11101 01rrr10b | 8 | - | - | - | - | - | - | - | - | R := J |
ld J,R | 11i11101 0110brrr | 8 | - | - | - | - | - | - | - | - | J := R |
ld ixh,ixl | 11011101 01100101 | 8 | - | - | - | - | - | - | - | - | ixh := ixl |
ld ixl,ixh | 11011101 01101100 | 8 | - | - | - | - | - | - | - | - | ixl := ixh |
ld iyh,iyl | 11111101 01100101 | 8 | - | - | - | - | - | - | - | - | iyh := iyl |
ld iyl,iyh | 11111101 01101100 | 8 | - | - | - | - | - | - | - | - | iyl := iyh |
ld R,N | 00rrr110 nnnnnnnn | 7 | - | - | - | - | - | - | - | - | R := N |
ld R,(hl) | 01rrr110 | 7 | - | - | - | - | - | - | - | - | R := (hl) |
ld R,(I+D) | 11i11101 01rrr110 dddddddd | 19 | - | - | - | - | - | - | - | - | R := (I+D) |
ld (hl),R | 01110rrr | 7 | - | - | - | - | - | - | - | - | (hl) := R |
ld (hl),N | 00110110 nnnnnnnn | 10 | - | - | - | - | - | - | - | - | (hl) := N |
ld (I+D),R | 11i11101 01110rrr dddddddd | 19 | - | - | - | - | - | - | - | - | (I+D) := R |
ld (I+D),N | 11i11101 00110110 dddddddd nnnnnnnn | 19 | - | - | - | - | - | - | - | - | (I+D) := N |
ld a,(bc) | 00001010 | 7 | - | - | - | - | - | - | - | - | a := (bc) |
ld a,(de) | 00011010 | 7 | - | - | - | - | - | - | - | - | a := (de) |
ld a,(A) | 00111010 alalalal ahahahah | 13 | - | - | - | - | - | - | - | - | a := (A) |
ld (bc),a | 00000010 | 7 | - | - | - | - | - | - | - | - | (bc) := a |
ld (de),a | 00010010 | 7 | - | - | - | - | - | - | - | - | (de) := a |
ld (A),a | 00110010 alalalal ahahahah | 13 | - | - | - | - | - | - | - | - | (A) := a |
ld i,a | 11101101 01000111 | 9 | - | - | - | - | - | - | - | - | i := a |
ld r,a | 11101101 01001111 | 9 | - | - | - | - | - | - | - | - | r := a |
ld a,i | 11101101 01010111 | 9 | + | + | + | 0 | + | X | 0 | - | a := i, pf := iff2 |
ld a,r | 11101101 01011111 | 9 | + | + | + | 0 | + | X | 0 | - | a := r, pf := iff2 |
ld Q,A | 00qq0001 alalalal ahahahah | 10 | - | - | - | - | - | - | - | - | Q := A |
ld I,A | 11i11101 00100001 alalalal ahahahah | 14 | - | - | - | - | - | - | - | - | I := A |
ld Q,(A) | 11101101 01qq1011 alalalal ahahahah | 20 | - | - | - | - | - | - | - | - | Q := (A) [Q shouldn't be hl, see below] |
ld hl,(A) | 00101010 alalalal ahahahah | 20 | - | - | - | - | - | - | - | - | hl := (A) |
ld I,(A) | 11i11101 00101010 alalalal ahahahah | 20 | - | - | - | - | - | - | - | - | I := (A) |
ld (A),Q | 11101101 01qq0011 alalalal ahahahah | 20 | - | - | - | - | - | - | - | - | (A) := Q [Q shouldn't be hl, see below] |
ld (A),hl | 00100010 alalalal ahahahah | 20 | - | - | - | - | - | - | - | - | (A) := hl |
ld (A),I | 11i11101 00100010 alalalal ahahahah | 20 | - | - | - | - | - | - | - | - | (A) := I |
ld sp,hl | 11111001 | 6 | - | - | - | - | - | - | - | - | sp := hl |
ld sp,I | 11i11101 11111001 | 10 | - | - | - | - | - | - | - | - | sp := I |
ldd | 11101101 10101000 | 16 | - | - | X | 0 | X | C | 0 | - | tmp := (hl), (de) := tmp, de -= 1, hl -= 1, bc -= 1, xf := [tmp + a].1, yf = [tmp + a].3 |
lddr | 11101101 10111000 | 21/16 | - | - | X | 0 | X | C | 0 | - | ldd, if bc <> 0 then pc -= 2 |
ldi | 11101101 10100000 | 16 | - | - | X | 0 | X | C | 0 | - | tmp := (hl), (de) := tmp, de += 1, hl += 1, bc -= 1, xf := [tmp + a].1, yf = [tmp + a].3 |
ldir | 11101101 10110000 | 21/16 | - | - | X | 0 | X | C | 0 | - | ldi, if bc <> 0 then pc -= 2 |
neg | 11101101 01***100 | 8 | + | + | + | + | + | V | 1 | + | a := 0 - a |
nop | 00000000 | 4 | - | - | - | - | - | - | - | - | nothing |
or R | 10110rrr | 4 | + | + | + | 0 | + | P | 0 | 0 | a := a OR R |
or J | 11i11101 1011010b | 8 | + | + | + | 0 | + | P | 0 | 0 | a := a OR J |
or N | 11110110 nnnnnnnn | 7 | + | + | + | 0 | + | P | 0 | 0 | a := a OR N |
or (hl) | 10110110 | 7 | + | + | + | 0 | + | P | 0 | 0 | a := a OR (hl) |
or (I+D) | 11i11101 10110110 dddddddd | 19 | + | + | + | 0 | + | P | 0 | 0 | a := a OR (I+D) |
out (N),a | 11010011 nnnnnnnn | 11 | - | - | - | - | - | - | - | - | ((N)) := a |
out (c),R | 11101101 01rrr001 | 12 | - | - | - | - | - | - | - | - | ((c)) := R |
out (c),0 | 11101101 01110001 | 12 | - | - | - | - | - | - | - | - | ((c)) := ? (seems to vary with CPU) |
outd | 11101101 10101011 | 16 | + | + | + | X | + | X | X | X | tmp := (hl), ((c)) := tmp, hl -= 1, b -= 1 => flags, nf := tmp.7, tmp2 = tmp + l, pf := parity of [[tmp2 AND 0x07] XOR b], hf := cf := tmp2 > 255 |
otdr | 11101101 10111011 | 21/16 | + | + | + | X | + | X | X | X | outd, if b <> 0 then pc -= 2 |
outi | 11101101 10100011 | 16 | + | + | + | X | + | X | X | X | tmp := (hl), ((c)) := tmp, hl += 1, b -= 1 => flags, nf := tmp.7, tmp2 = tmp + l, pf := parity of [[tmp2 AND 0x07] XOR b], hf := cf := tmp2 > 255 |
otir | 11101101 10110011 | 21/16 | + | + | + | X | + | X | X | X | outi, if b <> 0 then pc -= 2 |
pop P | 11pp0001 | 10 | - | - | - | - | - | - | - | - | P := (sp), sp += 2 |
pop I | 11i11101 11100001 | 14 | - | - | - | - | - | - | - | - | I := (sp), sp += 2 |
push P | 11pp0101 | 11 | - | - | - | - | - | - | - | - | sp -= 2, (sp) := P |
push I | 11i11101 11100101 | 15 | - | - | - | - | - | - | - | - | sp -= 2, (sp) := I |
res B,R | 11001011 10bbbrrr | 8 | - | - | - | - | - | - | - | - | R := R AND ~[1 << B] |
res B,(hl) | 11001011 10bbb110 | 15 | - | - | - | - | - | - | - | - | (hl) := (hl) AND ~[1 << B] |
res B,(I+D) | 11i11101 11001011 dddddddd 10bbb110 | 23 | - | - | - | - | - | - | - | - | (I+D) := (I+D) AND ~[1 << B] |
res B,(I+D)->R | 11i11101 11001011 dddddddd 10bbbrrr | 23 | - | - | - | - | - | - | - | - | R := (I+D) := (I+D) AND ~[1 << B] |
ret | 11001001 | 10 | - | - | - | - | - | - | - | - | pc := (sp), sp += 2 |
ret C | 11ccc000 | 11/5 | - | - | - | - | - | - | - | - | if C then pc := (sp), sp += 2 |
reti | 11101101 01**1101 | 14 | - | - | - | - | - | - | - | - | pc := (sp), sp += 2, iff1 := iff2 |
retn | 11101101 01**0101 | 14 | - | - | - | - | - | - | - | - | pc := (sp), sp += 2, iff1 := iff2 |
Legend
Notation | Meaning | Respective opcode bits |
---|---|---|
A | 16-bit address or immediate | alalalal ahahahah |
B | Bit number: 0..7 | bbb = 000..111 |
C | Condition: nz, z, nc, c, po, pe, p, m | ccc = 000, 001, 010, 011, 100, 101, 110, 111 |
D | 8-bit signed relative offset | dddddddd |
E | 16-bit relative address | dddddddd (E minus address of next instruction) |
I | Index register: ix, iy | i = 0, 1 |
J | Half index register: ixh, ixl, iyh, iyl | (i, b) = (0, 0), (0, 1), (1, 0), (1, 1) |
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/ix/iy, 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 (if noted, by the operation marked with '=> flags'):
- 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 (theoretical bit 4) 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
- C = set if the counter (bc) is nonzero after decrementing
Miscellaneous
- () = indirection
- (()) = I/O port
- [] = operator precedence (to avoid confusion with indirection)
- E.B = the Bth bit of the value of expression E
- * = any bit value (0 or 1)