Program Status Word: Difference between revisions

Latest revision as of 14:13, 29 December 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.

Reference

subparagraph 8.1.6, page 3-8-6 of Book I of the official Super Nintendo development manual

@@ Line 1: / Line 1: @@
-The '''Program Status Word''' is an 8-bit register on the [[SPC700]] that stores the value of status flags.  They are typically listed in this order: NVPBHIZC.  More verbosely:
+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:
-* Negative Flag
+{| class="wikitable"
-* overflow Flag
+!colspan="2"|
-* [[direct page flag]]
+|+
-* [[Break Flag]]
+! Flag Name !! Bit Position
-* [[Half-carry flag]]
+|+
-* [[Interrupt Enable Flag]]
+| [[Negative Flag]] || bit 7
-* Zero Flag
+|+
-* Carry flag
+| [[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.
+=== See Also ===
+* [[Processor Status Register]]
+=== Reference ===
+* subparagraph 8.1.6, [https://archive.org/details/SNESDevManual/book1/page/n184 page 3-8-6 of Book I] of the official Super Nintendo development manual
 [[Category:ASM]]
 [[Category:SPC700]]
+[[Category:Registers]]
 [[Category:Flags]]