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Half-Carry Flag: Difference between revisions
From SnesLab
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=== References === | === References === | ||
* https://problemkaputt.de/fullsnes.htm#snesapuspc700cpuoverview | * https://problemkaputt.de/fullsnes.htm#snesapuspc700cpuoverview | ||
* https://archive.org/details/SNESDevManual/book1/page/n184 | |||
Revision as of 12:46, 17 July 2024
The Half-carry flag (H) exists on the SPC700, as bit 3 of the Program Status Word. It applies to the bottom 4 bits of the accumulator, meaning it is set whenever bit 3 of an ALU operation carries over into bit 4.
It is cleared by CLRV, but there is no SETV command to set it.
Whenever H is set, the overflow flag is set as well.