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STA: Difference between revisions
From SnesLab
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* [[STY]] | * [[STY]] | ||
* [[STZ]] | * [[STZ]] | ||
=== External Links === | |||
* [[Eyes & Lichty]] page on STA: https://archive.org/details/0893037893ProgrammingThe65816/page/n529 | |||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:Group One Instructions]] | [[Category:Group One Instructions]] | ||
[[Category:Inherited from 6502]] | [[Category:Inherited from 6502]] | ||
Revision as of 22:56, 15 May 2023
STA (Store Accumulator) is a 65x instruction that stores the value of the accumulator.
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| absolute | 8D | 3 bytes | 4 cycles | ||||
| absolute long | 8F | 4 bytes | 5 cycles | ||||
| direct page | 85 | 2 bytes | 3 cycles | ||||
| direct page indirect | 92 | 2 bytes | 5 cycles | ||||
| direct page indirect long | 87 | 2 bytes | 6 cycles | ||||
| absolute indexed by X | 9D | 3 bytes | 4 cycles | ||||
| absolute long indexed by X | 9F | 4 bytes | 5 cycles | ||||
| absolute indexed by Y | 99 | 3 bytes | 4 cycles | ||||
| direct page indexed by X | 95 | 2 bytes | 4 cycles | ||||
| direct page indexed indirect by X | 81 | 2 bytes | 6 cycles | ||||
| direct page indirect indexed by Y | 91 | 2 bytes | 5 cycles | ||||
| direct page indirect long indexed by Y | 97 | 2 bytes | 6 cycles | ||||
| stack relative | 83 | 2 bytes | 4 cycles | ||||
| stack relative indirect indexed by Y | 93 | 2 bytes | 7 cycles | ||||
| Flags Clobbered | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | . | . | . | |