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BIT: Difference between revisions
From SnesLab
(made basic info table shorter) |
(linkify immediate and absolute) |
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| Line 7: | Line 7: | ||
|'''Speed''' | |'''Speed''' | ||
|+ | |+ | ||
| | |[[Immediate]] | ||
|89 | |89 | ||
|2 bytes | |2 bytes | ||
|2 cycles | |2 cycles | ||
|+ | |+ | ||
| | |[[Absolute]] | ||
|2C | |2C | ||
|3 bytes | |3 bytes | ||
Revision as of 04:13, 20 November 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Immediate | 89 | 2 bytes | 2 cycles | ||||
| Absolute | 2C | 3 bytes | 4 cycles | ||||
| direct page | 24 | 2 bytes | 3 cycles | ||||
| absolute indexed X | 3C | 3 bytes | 4 cycles | ||||
| direct page indexed X | 34 | 2 bytes | 4 cycles | ||||
| Flags Clobbered | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | ||||
BIT is a 65x instruction that performs a logical AND operation between the accumulator and memory without storing the conjunction.
External Links
- Eyes & Lichty page on BIT: https://archive.org/details/0893037893ProgrammingThe65816/page/n457
- Labiak page on BIT: https://archive.org/details/Programming_the_65816/page/n131
- MCS6500 Manual page on BIT: https://archive.org/details/mos_microcomputers_programming_manual/page/n62
- Carr page on BIT: https://archive.org/details/6502UsersManual/page/n262
- Leventhal page on BIT: https://archive.org/details/6502-assembly-language-programming/page/n94
- snes9x implementation of BIT: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L265
- undisbeliever on BIT: https://undisbeliever.net/snesdev/65816-opcodes.html#bit-test-memory-bits-against-accumulator