CLR1 (SPC700): Difference between revisions

Revision as of 07:44, 18 December 2023


Basic Info
Addressing Mode	Opcode	Length	Speed
Direct Page	12	2 bytes	4 cycles
Direct Page	32	2 bytes	4 cycles
Direct Page	52	2 bytes	4 cycles
Direct Page	72	2 bytes	4 cycles
Direct Page	92	2 bytes	4 cycles
Direct Page	B2	2 bytes	4 cycles
Direct Page	D2	2 bytes	4 cycles
Direct Page	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
section 8.2.3.1 of page 3-8-8, lbid.

@@ Line 70: / Line 70: @@
 |}
-'''CLR1''' is an [[SPC700]] command that clears a bit in a [[direct page]] byte.  The byte following the opcode determines which byte.  The high nibble of the opcode determines which bit within that byte.
+'''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 ===