View source for Z80 wait instructions

Z80 instruction set that don't change registers value (except for F and R registers):
{| class="wikitable"
! Inst. !! T-S !! Bytes !! Flag modification
|-
| <tt>NOP</tt>                    ||  5 || 1 || None
|-
| <tt>CP (HL)</tt>                ||  8 || 1 || C, S, and Z flags modified by definition. P/V detects overflow.
|-
| <tt>NOP<br/>NOP</tt>            || 10 || 2 || None
|-
| <tt>LD R,A</tt>                 || 11 || 2 || C is preserved, H and N are reset, and alters Z and S. P/V is set if interrupts are enabled, reset otherwise.
|-
| <tt>NOP<br/>CP (HL)</tt>        || 13 || 2 || C, S, and Z flags modified by definition. P/V detects overflow.
|-
| <tt>BIT 0,(HL)</tt>             || 14 || 2 || Opposite of the bit #0 is written into the Z flag. C is preserved, N is reset, H is set, and S and P/V are undefined.
|-
| <tt>NOP<br/>NOP<br/>NOP</tt>    || 15 || 3 || None
|-
| <tt>CP (HL)<BR/>CP (HL)</tt>    || 16 || 2 || C, S, and Z flags modified by definition. P/V detects overflow.
|-
| <tt>NOP<br/>NOP<br/>CP (HL)</tt>|| 18 || 3 || C, S, and Z flags modified by definition. P/V detects overflow.
|-
| <tt>NOP<br/>BIT 0,(HL)</tt>     || 19 || 3 || Opposite of the bit #0 is written into the Z flag. C is preserved, N is reset, H is set, and S and P/V are undefined.
|-
| <tt>NOP<br/>NOP<br/>NOP<br/>NOP</tt> || 20 || 4 || None
|-
| <tt>CP (IY+0)</tt>              || 21 || 3 || C, S, and Z flags modified by definition. P/V detects overflow.
|-
| <tt>CP (HL)<br/>BIT 0,(HL)</tt> || 22 || 3 || C, S, and Z flags modified by definition. P/V detects overflow. Opposite of the bit #0 is written into the Z flag. C is preserved, N is reset, H is set, and S and P/V are undefined.
|-
| <tt>PUSH AF<br/>POP AF</tt>     || 23 || 2 || None
|-
| <tt>CP (HL)<BR/>CP (HL)<BR/>CP (HL)</tt> || 24 || 3 || C, S, and Z flags modified by definition. P/V detects overflow.
|-
| <tt>NOP<br/>NOP<br/>NOP<br/>NOP<br/>NOP</tt> || 25 || 5 || None
|-
| <tt>NOP<br/>CP (IY+0)</tt>      || 26 || 4 || C, S, and Z flags modified by definition. P/V detects overflow.
|-
| <tt>NOP<br/>BIT 0,(IY+0)</tt>   || 27 || 5 || Opposite of the bit #0 is written into the Z flag. C is preserved, N is reset, H is set, and S and P/V are undefined.
|-
| <tt>NOP<br/>PUSH AF<br/>POP AF</tt> || 23 || 2 || None
|-
| <tt>CP (IY+0)<br/>CP (HL)</tt>  || 29 || 4 || C, S, and Z flags modified by definition. P/V detects overflow.
|-
| <tt>BIT 0,(HL)<br/>CP (HL)<br/>CP (HL)</tt> || 30 || 4 || Opposite of the bit #0 is written into the Z flag. C is preserved, N is reset, H is set, and S and P/V are undefined. C, S, and Z flags modified by definition. P/V detects overflow.
|}