RLC b,BCDE     Rotate Left Affect Carry     Rabbit 4000 Instruction

Opcode	Instruction	Clocks	Operation
--	RLC b,BCDE	4 (2,2)	BCDE = {BCDE[30,0],B[7]}   CF = B[7]   b = b-1 repeat while b != 0
DD 68	RLC 1,BCDE	4 (2,2)	BCDE = {BCDE[30,0],B[7]}   CF = B[7]   b = b-1 repeat while b != 0
DD 69	RLC 2,BCDE	4 (2,2)	BCDE = {BCDE[30,0],B[7]}   CF = B[7]   b = b-1 repeat while b != 0
DD 6B	RLC 4,BCDE	4 (2,2)	BCDE = {BCDE[30,0],B[7]}   CF = B[7]   b = b-1 repeat while b != 0

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

Description

Rotates BCDE to the left (bit 0 moves to bit 1, bit 1 moves to bit 2 etc.). Bit 31 moves to the C flag and bit 0. See the figure below.

Figure 6: The bit logic of the RLC operation.

This operation happens b number of times.