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PCALL (SPC700): Difference between revisions
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{| class="wikitable" style="float:right;clear:right;width: | {| class="wikitable" style="float:right;clear:right;width:40%" | ||
!colspan="8"|Basic Info | !colspan="8"|Basic Info | ||
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|'''Speed''' | |'''Speed''' | ||
|+ | |+ | ||
| | |[[Uppermost Page Addressing | Uppermost Page]] | ||
|4F | |4F | ||
|2 | |2 bytes | ||
|6 cycles | |6 cycles | ||
|} | |} | ||
{| class="wikitable" style="float:right;clear:right;width:30%" | {| class="wikitable" style="float:right;clear:right;width:30%" | ||
!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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|. | |. | ||
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'''PCALL''' (uPage CALl) is an [[SPC700]] instruction that runs a subroutine in the [[ | '''PCALL''' (uPage CALl) is an [[SPC700]] instruction that runs a subroutine in the [[uppermost page]]. The operand specifies the low byte of the target address within the uppermost page. | ||
No flags are affected. | |||
==== Syntax ==== | |||
<pre> | |||
PCALL upage | |||
</pre> | |||
PCALL $xx has the same effect as [[CALL]] $FFxx.<sup>[2]</sup> | |||
=== See Also === | === See Also === | ||
* [[TCALL]] | * [[TCALL]] | ||
* [[RET]] | |||
* [[JSR]] | |||
=== External Links === | === External Links === | ||
# Official Nintendo documentation on PCALL: Table C-16 [https://archive.org/details/SNESDevManual/book1/page/n234 Appendix C-9 of Book I] | |||
# https://forums.nesdev.org/viewtopic.php?t=13313 | |||
# https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L534 | |||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:SPC700]] | [[Category:SPC700]] | ||
[[Category:Subroutine Call Return Commands]] | |||
[[Category:Two-byte Instructions]] | |||
Latest revision as of 21:55, 10 August 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Uppermost Page | 4F | 2 bytes | 6 cycles | ||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| N | V | P | B | H | I | Z | C |
| . | . | . | . | . | . | . | . |
PCALL (uPage CALl) is an SPC700 instruction that runs a subroutine in the uppermost page. The operand specifies the low byte of the target address within the uppermost page.
No flags are affected.
Syntax
PCALL upage
PCALL $xx has the same effect as CALL $FFxx.[2]
See Also
External Links
- Official Nintendo documentation on PCALL: Table C-16 Appendix C-9 of Book I
- https://forums.nesdev.org/viewtopic.php?t=13313
- https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L534