RETI (SPC700): Difference between revisions

Latest revision as of 19:25, 4 August 2024


Basic Info
Addressing Mode	Opcode	Length	Speed
Stack	7F	1 byte	6 cycles


Flags Affected
N	V	P	B	H	I	Z	C
N	V	P	B	H	I	Z	C

RETI (RETurn from Interrupt) is an SPC700 instruction that returns from an interrupt handler. All program status word flags are popped off the stack and restored. The program counter is also popped from the stack.

As the S-SMP has no hardware interrupt sources, this generally means returning from a BRK.

RETI

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 |[[Carry Flag|C]]
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 |}
-'''RETI''' (RETurn from Interrupt) is an [[SPC700]] instruction that returns from an interrupt.  All [[program status word]] flags are restored after being popped off the [[stack]].  The [[program counter]] is also popped from the stack.
+'''RETI''' (RETurn from Interrupt) is an [[SPC700]] instruction that returns from an [[interrupt handler]].  All [[program status word]] flags are popped off the [[stack]] and restored.  The [[program counter]] is also popped from the stack.
+As the S-SMP has no hardware interrupt sources, this generally means returning from a [[BRK (SPC700)|BRK]].
 ==== Syntax ====
@@ Line 43: / Line 45: @@
 === See Also ===
+* [[EI]]
+* [[DI]]
 * [[RET]]
 * [[RTI]]
 * [[RTS]]
+* [[RTL]]
 === References ===
 * Table C-16 in [https://archive.org/details/SNESDevManual/book1/page/n234 Appendix C-9 of Book I] of the official Super Nintendo development manual
+* anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L547
 [[Category:ASM]]