PUSH (SPC700): Difference between revisions

Latest revision as of 03:54, 9 August 2024


Basic Info
Addressing Mode	Opcode	Length	Speed
Accumulator	2D	1 byte	4 cycles
Stack - X	4D	1 byte	4 cycles
Stack - Y	6D	1 byte	4 cycles
Stack - PSW	0D	1 byte	4 cycles


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

PUSH is an SPC700 command that pushes the value of a register to the stack. The register can be:

The stack pointer is decremented by one after the value is transferred. No flags are affected.

Syntax

PUSH A
PUSH X
PUSH Y
PUSH PSW

References

Table C-17 in Appendix C-9 of Book I of the official Super Nintendo development manual
anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L541

@@ Line 1: / Line 1: @@
-'''PUSH''' is an [[SPC700]] command that pushes the value of registers to the stack.
+{| class="wikitable" style="float:right;clear:right;width:40%"
-{| class="wikitable" style="float:right;clear:right;width:30%"
 !colspan="8"|Basic Info
 |+
@@ Line 9: / Line 7: @@
 |'''Speed'''
 |+
-|implied
+|[[Accumulator Addressing | Accumulator]]
-|
+|2D
+|1 byte
+|4 cycles
+|+
+|[[Stack Addressing | Stack]] - X
+|4D
+|1 byte
+|4 cycles
+|+
+|[[Stack Addressing | Stack]] - Y
+|6D
+|1 byte
+|4 cycles
+|+
+|[[Stack Addressing | Stack]]
+- PSW
+|0D
 |1 byte
 |4 cycles
@@ Line 16: / Line 30: @@
 {| 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 36: / Line 50: @@
 |.
 |}
+'''PUSH''' is an [[SPC700]] command that pushes the value of a register to the [[stack]].  The register can be:
+* the [[accumulator]]
+* the [[X index register]]
+* the [[Y index register]]
+* the [[program status word]]
+The [[stack pointer]] is decremented by one after the value is transferred.  No flags are affected.
+==== Syntax ====
+<pre>
+PUSH A
+PUSH X
+PUSH Y
+PUSH PSW
+</pre>
 === See Also ===
 * [[POP]]
+* [[PHA]]
+* [[PHX]]
+* [[PHY]]
+* [[PHP]]
 === References ===
-* [https://archive.org/details/SNESDevManual/book1/page/n234 Appendix C-9 of Book I] of the official Super Nintendo development manual
+* Table C-17 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#L541
 [[Category:ASM]]
 [[Category:SPC700]]
 [[Category:Stack Operation Commands]]
+[[Category:One-byte Instructions]]