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STZ: Difference between revisions
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'''STZ''' (Store Zero) is a [[65c816]] instruction that zeros out memory. | '''STZ''' (Store Zero) is a [[65c816]] instruction that zeros out memory. | ||
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!colspan="8"|Basic Info | !colspan="8"|Basic Info | ||
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Revision as of 19:58, 13 July 2023
STZ (Store Zero) is a 65c816 instruction that zeros out memory.
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| absolute | 9C | 3 bytes | 4 cycles | ||||
| direct page | 64 | 2 bytes | 3 cycles | ||||
| absolute indexed X | 9E | 3 bytes | 5 cycles | ||||
| direct page indexed X | 74 | 2 bytes | 4 cycles | ||||
| Flags Clobbered | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | . | . | . | |
See Also
External Links
- Eyes & Lichty page on STZ: https://archive.org/details/0893037893ProgrammingThe65816/page/n533
- Labiak page on STZ: https://archive.org/details/Programming_the_65816/page/n198
- snes9x implementation of STZ: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1317
- undisbeliever on STZ: https://undisbeliever.net/snesdev/65816-opcodes.html#stz-store-zero-to-memory