Difference between revisions of "Z80 wait instructions"
From MSX Game Library
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|- | |- | ||
| <tt>NOP<br/>NOP</tt> || 10 || 2 || None | | <tt>NOP<br/>NOP</tt> || 10 || 2 || None | ||
| + | |- | ||
| + | | <tt>LD R,A</tt> || 11 || 2 || ??? | ||
|- | |- | ||
| <tt>NOP<br/>OR 0</tt>|| 13 || 3 || C and N flags cleared, P/V detects parity, and rest are modified by definition. | | <tt>NOP<br/>OR 0</tt>|| 13 || 3 || C and N flags cleared, P/V detects parity, and rest are modified by definition. | ||
|- | |- | ||
| − | | <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>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. |
|} | |} | ||
Revision as of 23:57, 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. |
| NOP NOP |
10 | 2 | None |
| LD R,A | 11 | 2 | ??? |
| NOP OR 0 |
13 | 3 | C and N flags cleared, P/V detects parity, and rest are modified by definition. |
| 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. |