RES b,r

Operation

rb <- 0

RES

b,r

Bit b in register r (any of registers B, C, D, E, H, L, or A) is reset. In the assembled object code, operands b and r are specified as follows:

Bit Tested	b	Reg	r	Hex	Reg	Hex	Reg	r	Hex	Reg	r	Hex	Reg	r	Hex	Reg	r	Hex	Reg	r	Hex
0	000	A	111	$87	B	$80	C	001	$81	D	010	$82	E	011	$83	H	100	$84	L	101	$85
1	001	A	111	$8F	B	$88	C	001	$89	D	010	$8A	E	011	$8B	H	100	$8C	L	101	$8D
2	010	A	111	$97	B	$90	C	001	$91	D	010	$92	E	011	$93	H	100	$94	L	101	$95
3	011	A	111	$9F	B	$98	C	001	$99	D	010	$9A	E	011	$9B	H	100	$9C	L	101	$9D
4	100	A	111	$A7	B	$A0	C	001	$A1	D	010	$A2	E	011	$A3	H	100	$A4	L	101	$A5
5	101	A	111	$AF	B	$A8	C	001	$A9	D	010	$AA	E	011	$AB	H	100	$AC	L	101	$AD
6	110	A	111	$B7	B	$B0	C	001	$B1	D	010	$B2	E	011	$B3	H	100	$B4	L	101	$B5
7	111	A	111	$BF	B	$B8	C	001	$B9	D	010	$BA	E	011	$BB	H	100	$BC	L	101	$BD

None

Upon the execution of

	RES	4,A

bit 4 in Register A is reset. Bit 0 is the least- significant bit.

Bit Tested	b	Reg	r	Hex	Reg	Hex	Reg	r	Hex	Reg	r	Hex	Reg	r	Hex	Reg	r	Hex	Reg	r	Hex
0	000	A	111	$87	B	$80	C	001	$81	D	010	$82	E	011	$83	H	100	$84	L	101	$85
1	001	A	111	$8F	B	$88	C	001	$89	D	010	$8A	E	011	$8B	H	100	$8C	L	101	$8D
2	010	A	111	$97	B	$90	C	001	$91	D	010	$92	E	011	$93	H	100	$94	L	101	$95
3	011	A	111	$9F	B	$98	C	001	$99	D	010	$9A	E	011	$9B	H	100	$9C	L	101	$9D
4	100	A	111	$A7	B	$A0	C	001	$A1	D	010	$A2	E	011	$A3	H	100	$A4	L	101	$A5
5	101	A	111	$AF	B	$A8	C	001	$A9	D	010	$AA	E	011	$AB	H	100	$AC	L	101	$AD
6	110	A	111	$B7	B	$B0	C	001	$B1	D	010	$B2	E	011	$B3	H	100	$B4	L	101	$B5
7	111	A	111	$BF	B	$B8	C	001	$B9	D	010	$BA	E	011	$BB	H	100	$BC	L	101	$BD

Bit Tested	b	Reg	r	Hex	Reg	Hex	Reg	r	Hex	Reg	r	Hex	Reg	r	Hex	Reg	r	Hex	Reg	r	Hex
0	000	A	111	$87	B	$80	C	001	$81	D	010	$82	E	011	$83	H	100	$84	L	101	$85
1	001	A	111	$8F	B	$88	C	001	$89	D	010	$8A	E	011	$8B	H	100	$8C	L	101	$8D
2	010	A	111	$97	B	$90	C	001	$91	D	010	$92	E	011	$93	H	100	$94	L	101	$95
3	011	A	111	$9F	B	$98	C	001	$99	D	010	$9A	E	011	$9B	H	100	$9C	L	101	$9D
4	100	A	111	$A7	B	$A0	C	001	$A1	D	010	$A2	E	011	$A3	H	100	$A4	L	101	$A5
5	101	A	111	$AF	B	$A8	C	001	$A9	D	010	$AA	E	011	$AB	H	100	$AC	L	101	$AD
6	110	A	111	$B7	B	$B0	C	001	$B1	D	010	$B2	E	011	$B3	H	100	$B4	L	101	$B5
7	111	A	111	$BF	B	$B8	C	001	$B9	D	010	$BA	E	011	$BB	H	100	$BC	L	101	$BD

Bit Tested	b	Reg	r	Hex	Reg	Hex	Reg	r	Hex	Reg	r	Hex	Reg	r	Hex	Reg	r	Hex	Reg	r	Hex
0	000	A	111	$87	B	$80	C	001	$81	D	010	$82	E	011	$83	H	100	$84	L	101	$85
1	001	A	111	$8F	B	$88	C	001	$89	D	010	$8A	E	011	$8B	H	100	$8C	L	101	$8D
2	010	A	111	$97	B	$90	C	001	$91	D	010	$92	E	011	$93	H	100	$94	L	101	$95
3	011	A	111	$9F	B	$98	C	001	$99	D	010	$9A	E	011	$9B	H	100	$9C	L	101	$9D
4	100	A	111	$A7	B	$A0	C	001	$A1	D	010	$A2	E	011	$A3	H	100	$A4	L	101	$A5
5	101	A	111	$AF	B	$A8	C	001	$A9	D	010	$AA	E	011	$AB	H	100	$AC	L	101	$AD
6	110	A	111	$B7	B	$B0	C	001	$B1	D	010	$B2	E	011	$B3	H	100	$B4	L	101	$B5
7	111	A	111	$BF	B	$B8	C	001	$B9	D	010	$BA	E	011	$BB	H	100	$BC	L	101	$BD