SLEEP (SPC700): Difference between revisions

Latest revision as of 06:03, 22 July 2024


Basic Info
Addressing Mode	Opcode	Length	Speed
Implied (type 3)	EF	1 byte	3 cycles


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

SLEEP is an SPC700 standby instruction. It hangs the S-SMP until reset.^[2] Nintendo does not want you to use this instruction.^[3]

EI and DI have no effect on the behavior of SLEEP.

No flags are affected.

SLEEP

Perhaps SLEEP would have been more useful if the APU supported hardware interrupts.

@@ Line 14: / Line 14: @@
 {| class="wikitable" style="float:right;clear:right;width:30%"
-!colspan="8"|Flags Clobbered
+!colspan="8"|Flags Affected
 |+
-|N
+|[[Negative Flag|N]]
-|V
+|[[Overflow Flag|V]]
-|P
+|[[Direct Page Flag|P]]
-|B
+|[[Break Flag|B]]
-|H
+|[[Half-Carry Flag|H]]
-|I
+|[[Interrupt Enable Flag|I]]
-|Z
+|[[Zero Flag|Z]]
-|C
+|[[Carry Flag|C]]
 |+
 |.
@@ Line 35: / Line 35: @@
 |}
-'''SLEEP''' is an [[SPC700]] standby instruction.  It hangs the [[S-SMP]] until reset.<sup>[2]</sup>
+'''SLEEP''' is an [[SPC700]] standby instruction.  It hangs the [[S-SMP]] until reset.<sup>[2]</sup>  Nintendo does not want you to use this instruction.<sup>[3]</sup>
+[[EI]] and [[DI]] have no effect on the behavior of SLEEP.
+No flags are affected.
+==== Syntax ====
+<pre>
+SLEEP
+</pre>
+Perhaps SLEEP would have been more useful if the APU supported hardware interrupts.
 === See Also ===
@@ Line 45: / Line 56: @@
 # Official Super Nintendo development manual on SLEEP: Table C-20 in [https://archive.org/details/SNESDevManual/book1/page/n235 Appendix C-10 of Book I]
 # https://problemkaputt.de/fullsnes.htm#snesapuspc700cpujumpcontrolcommands
+# [https://archive.org/details/SNESDevManual/book1/page/n226 Appendix C-1]
+# anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L584
 [[Category:ASM]]
 [[Category:SPC700]]
 [[Category:Other SPC700 Commands]]
+[[Category:One-byte Instructions]]