CLR1 (SPC700): Difference between revisions

Latest revision as of 13:22, 29 December 2023


Basic Info
Addressing Mode	Opcode	Length	Speed
Direct Page Bit	12	2 bytes	4 cycles
Direct Page Bit	32	2 bytes	4 cycles
Direct Page Bit	52	2 bytes	4 cycles
Direct Page Bit	72	2 bytes	4 cycles
Direct Page Bit	92	2 bytes	4 cycles
Direct Page Bit	B2	2 bytes	4 cycles
Direct Page Bit	D2	2 bytes	4 cycles
Direct Page Bit	F2	2 bytes	4 cycles


Flags Affected
N	V	P	B	H	I	Z	C
.	.	.	.	.	.	.	.

CLR1 is an SPC700 command that clears a bit in a direct page byte. The byte following the opcode determines which byte. The most significant 3 bits of the opcode determines which bit within that byte.

External Links

Official Nintendo documentation on CLR1: Table C-18 in Appendix C-9 of Book I
subparagraph 8.2.3.1 of page 3-8-8, lbid.

@@ Line 1: / Line 1: @@
-'''CLR1''' is an [[SPC700]] command that clears the [[direct page flag]].
+{| class="wikitable" style="float:right;clear:right;width:40%"
+!colspan="8"|Basic Info
+|+
+|'''Addressing Mode'''
+|'''Opcode'''
+|'''Length'''
+|'''Speed'''
+|+
+|[[Direct Page Bit Addressing | Direct Page Bit]]
+|12
+|2 bytes
+|4 cycles
+|+
+|[[Direct Page Bit Addressing | Direct Page Bit]]
+|32
+|2 bytes
+|4 cycles
+|+
+|[[Direct Page Bit Addressing | Direct Page Bit]]
+|52
+|2 bytes
+|4 cycles
+|+
+|[[Direct Page Bit Addressing | Direct Page Bit]]
+|72
+|2 bytes
+|4 cycles
+|+
+|[[Direct Page Bit Addressing | Direct Page Bit]]
+|92
+|2 bytes
+|4 cycles
+|+
+|[[Direct Page Bit Addressing | Direct Page Bit]]
+|B2
+|2 bytes
+|4 cycles
+|+
+|[[Direct Page Bit Addressing | Direct Page Bit]]
+|D2
+|2 bytes
+|4 cycles
+|+
+|[[Direct Page Bit Addressing | Direct Page Bit]]
+|F2
+|2 bytes
+|4 cycles
+|}
+{| class="wikitable" style="float:right;clear:right;width:30%"
+!colspan="8"|Flags Affected
+|+
+|[[Negative Flag|N]]
+|[[Overflow Flag|V]]
+|[[Direct Page Flag|P]]
+|[[Break Flag|B]]
+|[[Half-Carry Flag|H]]
+|[[Interrupt Enable Flag|I]]
+|[[Zero Flag|Z]]
+|[[Carry Flag|C]]
+|+
+|.
+|.
+|.
+|.
+|.
+|.
+|.
+|.
+|}
+'''CLR1''' is an [[SPC700]] command that clears a bit in a [[direct page]] byte.  The byte following the opcode determines which byte.  The most significant 3 bits of the opcode determines which bit within that byte.
+=== See Also ===
+* [[SET1]]
+* [[TCLR1]]
+* [[RMB]]
+=== External Links ===
+* Official Nintendo documentation on CLR1: Table C-18 in [https://archive.org/details/SNESDevManual/book1/page/n234 Appendix C-9 of Book I]
+* subparagraph 8.2.3.1 of [https://archive.org/details/SNESDevManual/book1/page/n186 page 3-8-8], lbid.
 [[Category:ASM]]
 [[Category:SPC700]]
 [[Category:Bit Operation Commands]]
+[[Category:Read-Modify-Write Instructions]]
+[[Category:Two-byte Instructions]]