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.

Syntax

STOP

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

References

Official Super Nintendo development manual on STOP: Table C-20 in Appendix C-10 of Book I
https://problemkaputt.de/fullsnes.htm#snesapuspc700cpujumpcontrolcommands
Summary of SPC700 Commands, Appendix C-1
anomie: https://github.com/yupferris/TasmShiz/blob/8fabc9764c33a7ae2520a76d80ed7220bb939f12/spc700.txt#L585

@@ Line 7: / Line 7: @@
 |'''Speed'''
 |+
-|implied
+|[[Implied]] (type 3)
 |FF
 |1 byte
@@ 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 43: / Line 54: @@
 === References ===
-# Official Super Nintendo development manual on STOP: [https://archive.org/details/SNESDevManual/book1/page/n235 Appendix C-10 of Book I]
+# 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]]