We've just updated MediaWiki and its underlying software. If anything doesn't look or work quite right, please mention it to us. --RanAS
PEA: Difference between revisions
From SnesLab
(→External Links: hid archive URL for E&L) |
(→External Links: hid archive URL for Labiak) |
||
| Line 59: | Line 59: | ||
=== External Links === | === External Links === | ||
* [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/473 page 473] on PEA | * [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/473 page 473] on PEA | ||
* [[Labiak]] | * [[Labiak]], [https://archive.org/details/Programming_the_65816/page/n167 page 157] on PEA | ||
* snes9x implementation of PEA: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1631 | * snes9x implementation of PEA: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1631 | ||
* undisbeliever on PEA: https://undisbeliever.net/snesdev/65816-opcodes.html#pea-push-effective-absolute-address | * undisbeliever on PEA: https://undisbeliever.net/snesdev/65816-opcodes.html#pea-push-effective-absolute-address | ||
Revision as of 22:49, 6 August 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Stack (absolute) | F4 | 3 bytes | 5 cycles | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | . | . | . | |
PEA (Push Effective Address) is a 65c816 instruction that pushes a 16-bit value to the stack. This value need not actually be an address. The stack pointer is decremented by two.
PEA can be thought of as using immediate addressing, although the immediate syntax is not used.
PEA ignores the state of the m and x flags. No flags are affected.
Syntax
PEA addr PEA const
PEA works even in emulation mode.
See Also
External Links
- Eyes & Lichty, page 473 on PEA
- Labiak, page 157 on PEA
- snes9x implementation of PEA: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1631
- undisbeliever on PEA: https://undisbeliever.net/snesdev/65816-opcodes.html#pea-push-effective-absolute-address
- Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#6.8.1
- https://wilsonminesco.com/816myths/65c816_myths-2_BDD.pdf