10		; Set initial state

CYCLE:		; Define the label CYCLE

test i 1	; Test input bit 379h:6 (Pin 10)
jz ABC		; Jump if tested bit is zero
jnz DEF		; Jump if tested bit is not zero

nop

ABC:
shift -1	; Rotate state unclockwise
goto CYCLE	; Goto the CYCLE label

DEF:
shift +1	; Rotate state clockwise
goto CYCLE	; Goto the CYCLE label