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Program Status Word: Difference between revisions

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Both the [[PUSH]] and [[POP]] commands can operate on the PSW.


[[Category:ASM]]
[[Category:ASM]]

Revision as of 19:29, 21 July 2023

The Program Status Word is an 8-bit register on the SPC700 that stores the values of status flags. They are typically listed in this order: NVPBHIZC. More verbosely:

Flag Name Bit Position
Negative Flag bit 7
overflow Flag bit 6
direct page flag bit 5
Break Flag bit 4
Half-carry flag bit 3
Interrupt Enable Flag bit 2
Zero Flag bit 1
Carry flag bit 0

Both the PUSH and POP commands can operate on the PSW.