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BIT: Difference between revisions
From SnesLab
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* [[Leventhal]] page on BIT: https://archive.org/details/6502-assembly-language-programming/page/n94 | * [[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 | * 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 | |||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:Group Three Instructions]] | [[Category:Group Three Instructions]] | ||
[[Category:Inherited from 6502]] | [[Category:Inherited from 6502]] | ||
Revision as of 04:02, 18 May 2023
BIT is a 65x instruction that performs a logical AND operation between the accumulator and memory without storing the conjunction.
| 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 | |
| . | . | . | . | . | ||||
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