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CLI: Difference between revisions
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'''CLI''' is a 65x instruction that clears the [[interrupt disable flag]], which enables maskable interrupts. To handle nested interrupts, a CLI is required. | '''CLI''' is a 65x instruction that clears the [[interrupt disable flag]], which enables maskable interrupts. To handle nested interrupts, a CLI is required. | ||
No other flags are affected. | |||
==== Syntax ==== | ==== Syntax ==== | ||
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CLI | CLI | ||
</pre> | </pre> | ||
The first [[machine cycle]] is to load the opcode byte, and the second is the [[internal cycle]]. | |||
=== See Also === | === See Also === | ||
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* [[IRQ]] | * [[IRQ]] | ||
* [[RTI]] | * [[RTI]] | ||
* [[REP]] | |||
=== External Links === | === External Links === | ||
Latest revision as of 16:58, 21 October 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Implied (type 2) | 58 | 1 byte | 2 cycles | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | 0 | . | . | |
CLI is a 65x instruction that clears the interrupt disable flag, which enables maskable interrupts. To handle nested interrupts, a CLI is required.
No other flags are affected.
Syntax
CLI
The first machine cycle is to load the opcode byte, and the second is the internal cycle.
See Also
External Links
- Eyes & Lichty, page 443 on CLI
- Labiak, page 132 on CLI
- 3.2.2 on MCS6500 Manual, page 26 on CLI
- Carr, page 254 on CLI
- Leventhal, page 3-54 on CLI
- snes9x implementation of CLI: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1434