Difference between revisions of "User:CoBB"

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(→‎Z80 instruction set)
(→‎Z80 instruction set)
Line 7: Line 7:
 
! Instruction !! Opcode !! Time !! S !! Z !! X !! H !! Y !! P !! N !! C !! Effect
 
! Instruction !! Opcode !! Time !! S !! Z !! X !! H !! Y !! P !! N !! C !! Effect
 
|-
 
|-
−
| call A || <tt>11001101 Al Ah</tt> || 17 || - || - || - || - || - || - || - || - || sp -= 2, (sp) := pc, pc := A
+
| adc a,R || <tt>10001rrr</tt> || 4 || + || + || + || + || + || V || 0 || + || a += R + cf
 
|-
 
|-
−
| ccf || <tt>00111111</tt> || 4 || - || - || v || X || v || - || 0 || X || hf := cf, cf := !cf
+
| adc a,N || <tt>11001110 nnnnnnnn</tt> || 7 || + || + || + || + || + || V || 0 || + || a += N + cf
 
|-
 
|-
−
| ld R1,R2 || <tt>01xxxyyy</tt> || 4 || - || - || - || - || - || - || - || - || R1 := R2
+
| adc a,(hl) || <tt>10001110</tt> || 7 || + || + || + || + || + || V || 0 || + || a += (hl) + cf
 
|-
 
|-
−
| pop P || <tt>11xx0001</tt> || 10 || - || - || - || - || - || - || - || - || P := (sp), sp += 2
+
| adc a,(ix+D) || <tt>11011101 10001110 dddddddd</tt> || 19 || + || + || + || + || + || V || 0 || + || a += (ix+D) + cf
 
|-
 
|-
−
| push P || <tt>11xx0101</tt> || 11 || - || - || - || - || - || - || - || - || sp -= 2, (sp) := P
+
| adc a,(iy+D) || <tt>11111101 10001110 dddddddd</tt> || 19 || + || + || + || + || + || V || 0 || + || a += (iy+D) + cf
 +
|-
 +
| adc hl,Q || <tt>11101101 01qq1010</tt> || 15 || + || + || + || + || + || V || 0 || + || hl += Q + cf
 +
|-
 +
| add a,R || <tt>10000rrr</tt> || 4 || + || + || + || + || + || V || 0 || + || a += R
 +
|-
 +
| add a,N || <tt>11000110 nnnnnnnn</tt> || 7 || + || + || + || + || + || V || 0 || + || a += N
 +
|-
 +
| add a,(hl) || <tt>10000110</tt> || 7 || + || + || + || + || + || V || 0 || + || a += (hl)
 +
|-
 +
| add a,(ix+D) || <tt>11011101 10000110 dddddddd</tt> || 19 || + || + || + || + || + || V || 0 || + || a += (ix+D)
 +
|-
 +
| add a,(iy+D) || <tt>11111101 10000110 dddddddd</tt> || 19 || + || + || + || + || + || V || 0 || + || a += (iy+D)
 +
|-
 +
| add hl,Q || <tt>00qq1001</tt> || 11 || - || - || + || + || + || - || 0 || + || hl += Q + cf
 +
|-
 +
| add ix,Q || <tt>11011101 00qq1001</tt> || 15 || - || - || + || + || + || - || 0 || + || ix += Q + cf
 +
|-
 +
| add iy,Q || <tt>11111101 00qq1001</tt> || 15 || - || - || + || + || + || - || 0 || + || iy += Q + cf
 +
|-
 +
| call A || <tt>11001101 alalalal ahahahah</tt> || 17 || - || - || - || - || - || - || - || - || sp -= 2, (sp) := pc, pc := A
 +
|-
 +
| ccf || <tt>00111111</tt> || 4 || - || - || A || X || A || - || 0 || X || hf := cf, cf := ~cf
 +
|-
 +
| ld R1,R2 || <tt>01rrrsss</tt> || 4 || - || - || - || - || - || - || - || - || R1 := R2
 +
|-
 +
| pop P || <tt>11pp0001</tt> || 10 || - || - || - || - || - || - || - || - || P := (sp), sp += 2
 +
|-
 +
| push P || <tt>11pp0101</tt> || 11 || - || - || - || - || - || - || - || - || sp -= 2, (sp) := P
 
|-
 
|-
 
| ret || <tt>11001001</tt> || 10 || - || - || - || - || - || - || - || - || pc := (sp), sp += 2
 
| ret || <tt>11001001</tt> || 10 || - || - || - || - || - || - || - || - || pc := (sp), sp += 2
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! Notation !! Meaning !! Respective opcode bits
 
! Notation !! Meaning !! Respective opcode bits
 
|-
 
|-
−
| A || 16-bit address || Al - low byte, Ah - high byte
+
| 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 || 00, 01, 10, 11
+
| P || 16-bit register pair: bc, de, hl, af || pp = 00, 01, 10, 11
 
|-
 
|-
−
| Q || 16-bit register: bc, de, hl, sp || 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 || 111, 000, 001, 010, 011, 100, 101
+
| R || 8-bit general purpose register: a, b, c, d, e, h, l || rrr (or sss) = 111, 000, 001, 010, 011, 100, 101
 
|}
 
|}
  
 
=== Flags ===
 
=== Flags ===
 
* - = no change
 
* - = 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
 
* 0 = always reset
 
* 1 = always set
 
* 1 = always set
−
* X = change, described under Effect
+
* X = change described under Effect
−
* v = OR with the respective bit of the accumulator
+
* P = parity (only for the parity flag)
 +
* V = overflow (only for the parity flag)
 +
* A = OR with the respective bit of the accumulator

Revision as of 23:46, 25 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 + cf
add ix,Q 11011101 00qq1001 15 - - + + + - 0 + ix += Q + cf
add iy,Q 11111101 00qq1001 15 - - + + + - 0 + iy += Q + cf
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
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