<< Previous | Next >>

RES b,r     Bit Reset     Rabbit 2000/3000/4000/5000 Instruction

Opcode								Instruction	Operation
b,r	A	B	C	D	E	H	L	RES b,r	r = r & ~bit
0	CB 87	CB 80	CB 81	CB 82	CB 83	CB 84	CB 85
1	CB 8F	CB 88	CB 89	CB 8A	CB 8B	CB 8C	CB 8D
2	CB 97	CB 90	CB 91	CB 92	CB 93	CB 94	CB 95
3	CB 9F	CB 98	CB 99	CB 9A	CB 9B	CB 9C	CB 9D
4	CB A7	CB A0	CB A1	CB A2	CB A3	CB A4	CB A5
5	CB AF	CB A8	CB A9	CB AA	CB AB	CB AC	CB AD
6	CB B7	CB B0	CB B1	CB B2	CB B3	CB B4	CB B5
7	CB BF	CB B8	CB B9	CB BA	CB BB	CB BC	CB BD

Clocks	8-Bit Access	16-Bit Unaligned	16-Bit Aligned
Rabbit 2000/3000/4000	4	n/a	n/a
Rabbit 5000	4	4	2

Flags				ALTD			IOI/IOE
S	Z	L/V	C	F	R	SP	S	D
-	-	-	-		·

Description

Resets bit b (any of the bits 0, 1, 2, 3, 4, 5, 6, or 7) of r (any of the registers A, B, C, D, E, H, or L).

The bit is reset by performing a bitwise AND between the selected bit and its complement.