STOP (SPC700): Difference between revisions

Latest revision as of 06:03, 22 July 2024


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


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

STOP 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 STOP.

No flags are affected.

STOP

Perhaps STOP 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: @@
 |}
-'''STOP''' is an [[SPC700]] standby instruction.  It hangs the [[S-SMP]] until reset. <sup>[2]</sup>
+'''STOP''' 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 STOP.
+No flags are affected.
+==== Syntax ====
+<pre>
+STOP
+</pre>
+Perhaps STOP would have been more useful if the APU supported hardware interrupts.
 === See Also ===
@@ Line 45: / Line 56: @@
 # Official Super Nintendo development manual on STOP: Table C-20 in [https://archive.org/details/SNESDevManual/book1/page/n235 Appendix C-10 of Book I]
 # https://problemkaputt.de/fullsnes.htm#snesapuspc700cpujumpcontrolcommands
+# Summary of SPC700 Commands, [https://archive.org/details/SNESDevManual/book1/page/n226 Appendix C-1]
+# anomie: https://github.com/yupferris/TasmShiz/blob/8fabc9764c33a7ae2520a76d80ed7220bb939f12/spc700.txt#L585
 [[Category:ASM]]
 [[Category:SPC700]]
 [[Category:Other SPC700 Commands]]
+[[Category:One-byte Instructions]]