We've just updated MediaWiki and its underlying software. If anything doesn't look or work quite right, please mention it to us. --RanAS
BIT: Difference between revisions
From SnesLab
(clobbered -> affected) |
(linkify dp) |
||
| Line 17: | Line 17: | ||
|4 cycles | |4 cycles | ||
|+ | |+ | ||
| | |[[Direct Page Addressing|Direct Page]] | ||
|24 | |24 | ||
|2 bytes | |2 bytes | ||
Revision as of 06:29, 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 Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| 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