CLR1 (SPC700)

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. In Nintendo's manual, the high nybble of the opcode is called y.

No flags are affected.

Syntax

CLR1 dip. bit

See Also

• SET1
• TCLR1
• RMB
• dip bit

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.
• anomie: https://github.com/yupferris/TasmShiz/blob/8fabc9764c33a7ae2520a76d80ed7220bb939f12/spc700.txt#L375