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PER: Difference between revisions
From SnesLab
(works in emulation mode) |
(→External Links: hid archive URL for E&L) |
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=== External Links === | === External Links === | ||
* [[Eyes & Lichty]] | * [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/475 page 475] on PER | ||
* [[Labiak]] page 159 on PER: https://archive.org/details/Programming_the_65816/page/n169 | * [[Labiak]] page 159 on PER: https://archive.org/details/Programming_the_65816/page/n169 | ||
* snes9x implementation of PER: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1685 | * snes9x implementation of PER: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1685 | ||
Revision as of 22:51, 6 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: https://archive.org/details/Programming_the_65816/page/n169
- 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