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PUSH (SPC700): Difference between revisions
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{| class="wikitable" style="float:right;clear:right;width:40%" | |||
{| class="wikitable" style="float:right;clear:right;width: | |||
!colspan="8"|Basic Info | !colspan="8"|Basic Info | ||
|+ | |+ | ||
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|'''Speed''' | |'''Speed''' | ||
|+ | |+ | ||
| | |[[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 | |1 byte | ||
|4 cycles | |4 cycles | ||
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!colspan="8"|Flags | !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]] | ||
|+ | |+ | ||
|. | |. | ||
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|. | |. | ||
|} | |} | ||
'''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 === | === See Also === | ||
* [[POP]] | * [[POP]] | ||
* [[PHA]] | |||
* [[PHX]] | |||
* [[PHY]] | |||
* [[PHP]] | |||
=== References === | |||
* 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:ASM]] | ||
[[Category:SPC700]] | [[Category:SPC700]] | ||
[[Category:Stack Operation Commands]] | |||
[[Category:One-byte Instructions]] | |||
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 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
PUSH A PUSH X PUSH Y PUSH PSW
See Also
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