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PEI: Difference between revisions
From SnesLab
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PEI (dp) | PEI (dp) | ||
PEI dp | |||
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Revision as of 14:17, 4 August 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Stack (Direct Page Indirect) | D4 | 2 bytes | 6 cycles* | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | . | . | . | |
PEI (Push Effective Indirect address) is a 65c816 instruction that pushes a 16-bit value to the stack. This value need not actually be an address.
No flags are affected.
Syntax
PEI (dp) PEI dp
Cycle Penalty
- PEI takes one extra cycle if the low byte of the direct page register is nonzero.
See Also
External Links
- Eyes & Lichty page 474, on PEI: https://archive.org/details/0893037893ProgrammingThe65816/page/474
- Labiak page 158 on PEI: https://archive.org/details/Programming_the_65816/page/n168
- snes9x implementation of PEI: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1658
- undisbeliever on PEI: https://undisbeliever.net/snesdev/65816-opcodes.html#pei-push-effective-indirect-address
- how PEI behaves in emulation mode - section 7.2 of 65c816 datasheet: https://www.westerndesigncenter.com/wdc/documentation/w65c816s.pdf
- Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#6.8.1