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SED: Difference between revisions
From SnesLab
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{| class="wikitable" style="float:right;clear:right;width:40%" | |||
{| class="wikitable" style="float:right;clear:right;width: | |||
!colspan="8"|Basic Info | !colspan="8"|Basic Info | ||
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|'''Speed''' | |'''Speed''' | ||
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| | |[[Implied]] (type 2) | ||
|F8 | |F8 | ||
|1 byte | |1 byte | ||
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{| class="wikitable" style="float:right;clear:right;width:30%" | {| class="wikitable" style="float:right;clear:right;width:30%" | ||
!colspan="9"|Flags | !colspan="9"|Flags Affected | ||
|+ | |+ | ||
|N | |[[Negative Flag|N]] | ||
|V | |[[Overflow Flag|V]] | ||
|M | |[[M Flag|M]] | ||
|X | |[[X Flag|X]] | ||
|D | |[[Decimal Flag|D]] | ||
|I | |[[I Flag|I]] | ||
|Z | |[[Zero Flag|Z]] | ||
|C | |[[Carry Flag|C]] | ||
|+ | |+ | ||
|. | |. | ||
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|. | |. | ||
|} | |} | ||
'''SED''' is a 65x instruction that sets the [[decimal mode flag]] so that [[ADC]] and [[SBC]] will operate on [[binary coded decimal]] data properly. Hexadecimal digits A through F will not appear in sums/differences because the result will be automatically adjusted to decimal. | |||
No other flags are affected. | |||
==== Syntax ==== | |||
<pre> | |||
SED | |||
</pre> | |||
=== See Also === | === See Also === | ||
* [[CLD]] | * [[CLD]] | ||
* [[BCD]] | * [[BCD]] | ||
* [[SEP]] | |||
=== External Links === | === External Links === | ||
* [[Eyes & Lichty]] page on SED: https://archive.org/details/ | * [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/500 page 500] on SED | ||
* [[Labiak]], [https://archive.org/details/Programming_the_65816/page/n191 page 181] on SED | |||
* 3.3.1 on [[MCS6500 Manual]], [https://archive.org/details/mos_microcomputers_programming_manual/page/n41 page 26] on SED | |||
* [[Carr]], [https://archive.org/details/6502UsersManual/page/n286 page 273] on SED | |||
* [[Leventhal]], [https://archive.org/details/6502-assembly-language-programming/page/n143 page 3-94] on SED | |||
* snes9x implementation of SED: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1434 | |||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:Inherited from 6502]] | [[Category:Inherited from 6502]] | ||
[[Category:One-byte Instructions]] | |||
[[Category:Implied Instructions]] | |||
[[Category:Two-cycle Instructions]] | |||
Latest revision as of 23:32, 19 September 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Implied (type 2) | F8 | 1 byte | 2 cycles | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | 1 | . | . | . | |
SED is a 65x instruction that sets the decimal mode flag so that ADC and SBC will operate on binary coded decimal data properly. Hexadecimal digits A through F will not appear in sums/differences because the result will be automatically adjusted to decimal.
No other flags are affected.
Syntax
SED
See Also
External Links
- Eyes & Lichty, page 500 on SED
- Labiak, page 181 on SED
- 3.3.1 on MCS6500 Manual, page 26 on SED
- Carr, page 273 on SED
- Leventhal, page 3-94 on SED
- snes9x implementation of SED: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1434