https://www.ndwiki.org/index.php?action=history&feed=atom&title=STFSTF - Revision history2026-05-09T04:50:16ZRevision history for this page on the wikiMediaWiki 1.43.8https://www.ndwiki.org/index.php?title=STF&diff=1081&oldid=prevTArntsen: STF instruction2009-08-08T14:24:55Z<p>STF instruction</p>
<p><b>New page</b></p><div>{{InstructionBox<br />
|Mnemonic=STF<br />
|Description=Store floating accumulator<br />
|Format=STF ''<[[ND-100 addressing modes|addr. mode]]> <[[displacement|disp.]]>''<br />
|Code=030&nbsp;000<br />
|Affected=(ea):=T, (ea+1):=A, (ea+2):=D<br />
|Architecture=[[ND-100]], [[ND-110 CPU|ND-110]]<br />
}}<br />
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'''STF''' is an assembly instruction. The content of the [[floating accumulator]] (T, A and D registers) is stored in three consecutive memory locations starting at [[effective address]]. The instruction always stores the three registers, even in CPUs with the [[32-bit floating point]] option. With 32-bit floating point units the application must use the [[STD]] doubleword instruction instead of STF. [[MAC]] programmers may use the MAC mnemonic [[STR]] instead, which will translate to STF or STD depending on target.<br />
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STF is also used as a generic 3-word store function, and applications may use STF with [[LDF]] to copy 3 words at the time with no floating point operation performed on the floating point accumulator. This usage is independent of which floating point option the CPU is equipped with.<br />
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== References ==<br />
*{{ND-doc|06.014.02|Page 3-19}}<br />
*{{ND-doc|06.029.01|Page 63}}<br />
*{{ND-doc|60.096.01|Appendix E}}<br />
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[[Category:ND-100 instructions]]</div>TArntsen