Difference between revisions of "Z80 wait instructions"
From MSX Game Library
| Line 4: | Line 4: | ||
| <tt>NOP</tt> || 5 || 1 || None | | <tt>NOP</tt> || 5 || 1 || None | ||
|- | |- | ||
| − | | <tt>OR 0</tt> || 8 || 2 || | + | | <tt>OR 0</tt> || 8 || 2 || C and N flags cleared, P/V detects parity, and rest are modified by definition. |
|- | |- | ||
| − | | <tt>AND 0</tt> || 8 || 2 || | + | | <tt>AND 0</tt> || 8 || 2 || C and N flags cleared, P/V is parity, rest are altered by definition. |
|- | |- | ||
| <tt>BIT 0, A</tt> || 10 || 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>BIT 0, A</tt> || 10 || 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. | ||
Revision as of 16:10, 2 March 2024
| Inst. | Wait CC |
Size (bytes) |
Flag modification |
|---|---|---|---|
| NOP | 5 | 1 | None |
| OR 0 | 8 | 2 | C and N flags cleared, P/V detects parity, and rest are modified by definition. |
| AND 0 | 8 | 2 | C and N flags cleared, P/V is parity, rest are altered by definition. |
| BIT 0, A | 10 | 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. |
| BIT 0, (HL) | 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. |