We've just updated MediaWiki and its underlying software. If anything doesn't look or work quite right, please mention it to us. --RanAS
PER: Difference between revisions
From SnesLab
(added Labiak page) |
(push category) |
||
| (26 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
{| 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 | ||
|+ | |+ | ||
| Line 9: | Line 7: | ||
|'''Speed''' | |'''Speed''' | ||
|+ | |+ | ||
| | |[[Stack Addressing|Stack]] (PC Relative Long) | ||
|62 | |62 | ||
|3 bytes | |3 bytes | ||
| Line 16: | Line 14: | ||
{| class="wikitable" style="float:right;clear:right;width:30%" | {| class="wikitable" style="float:right;clear:right;width:30%" | ||
!colspan="9"|Flags | !colspan="9"|Flags Affected | ||
|+ | |+ | ||
|N | |[[Negative Flag|N]] | ||
|V | |[[Overflow Flag|V]] | ||
|M | |[[M Flag|M]] | ||
|X | |[[X Flag|X]] | ||
|D | |[[Decimal Flag|D]] | ||
|I | |[[I Flag|I]] | ||
|Z | |[[Zero Flag|Z]] | ||
|C | |[[Carry Flag|C]] | ||
|+ | |+ | ||
|. | |. | ||
| Line 36: | Line 34: | ||
|. | |. | ||
|} | |} | ||
'''PER''' (Push pc RElative indirect Address) is a [[65c816]] instruction that pushes a 16-bit sum to the [[stack]]. The addends are: | |||
* the [[program counter]] after it has been incremented to point to the instruction following PER, and | |||
* the 16-bit displacement following the PER opcode. | |||
The high byte of the sum is pushed before the low byte. | |||
No flags are affected. Neither the [[program bank register]] or [[program counter]] are modified either. | |||
==== Syntax ==== | |||
<pre> | |||
PER label | |||
PER #label | |||
</pre> | |||
Assemblers that accept PER with the # syntax are rare. | |||
PER works even in [[emulation mode]]. | |||
=== See Also === | === See Also === | ||
* [[PEA]] | * [[PEA]] | ||
* [[PEI]] | * [[PEI]] | ||
* [[return address]] | |||
=== External Links === | === External Links === | ||
* [[Eyes & Lichty]] | * [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/475 page 475] on PER | ||
* [[Labiak]] | * [[Labiak]], [https://archive.org/details/Programming_the_65816/page/n169 page 159] on PER | ||
* snes9x implementation of PER: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1685 | |||
* undisbeliever on PER: https://undisbeliever.net/snesdev/65816-opcodes.html#per-push-effective-pc-relative-indirect-address | |||
* Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#6.8.1 | |||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:65c816 additions]] | [[Category:65c816 additions]] | ||
[[Category:Push Instructions]] | |||
[[Category:Three-byte Instructions]] | |||
[[Category:Six-cycle Instructions]] | |||
Latest revision as of 23:00, 12 August 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Stack (PC Relative Long) | 62 | 3 bytes | 6 cycles | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | . | . | . | |
PER (Push pc RElative indirect Address) is a 65c816 instruction that pushes a 16-bit sum to the stack. The addends are:
- the program counter after it has been incremented to point to the instruction following PER, and
- the 16-bit displacement following the PER opcode.
The high byte of the sum is pushed before the low byte.
No flags are affected. Neither the program bank register or program counter are modified either.
Syntax
PER label PER #label
Assemblers that accept PER with the # syntax are rare.
PER works even in emulation mode.
See Also
External Links
- Eyes & Lichty, page 475 on PER
- Labiak, page 159 on PER
- snes9x implementation of PER: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1685
- undisbeliever on PER: https://undisbeliever.net/snesdev/65816-opcodes.html#per-push-effective-pc-relative-indirect-address
- Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#6.8.1