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EI (SPC700): Difference between revisions
From SnesLab
(→See Also: SEI) |
(no hardware interrupts) |
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The manual has a typo where the flag which is set is in the [[zero flag]]'s position instead. | The manual has a typo where the flag which is set is in the [[zero flag]]'s position instead. | ||
As the [[S-SMP]] has no interrupt sources, EI is not very useful. | As the [[S-SMP]] has no hardware interrupt sources, EI is not very useful. | ||
==== Syntax ==== | ==== Syntax ==== | ||
Revision as of 04:39, 22 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Implied (type 2) | A0 | 1 byte | 3 cycles | ||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| N | V | P | B | H | I | Z | C |
| . | . | . | . | . | 1 | . | . |
EI (Enable Interrupts) is an SPC700 instruction that sets the interrupt enable flag.
The manual has a typo where the flag which is set is in the zero flag's position instead.
As the S-SMP has no hardware interrupt sources, EI is not very useful.
Syntax
EI
See Also
External Links
- Official Super Nintendo development manual on EI: Table C-19 in Appendix C-10 of Book I
- anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L428