44-Pin Demo Board Lessons
EXAMPLE 3-6:
REVERSIBLE VARIABLE SPEED ROTATE EXAMPLE
Original Version:
Rotate:
RRF
Display,f
BTFSC
BSF
STATUS,C
Display,7
; Did the bit rotate into the carry?
; yes, put it into bit 7.
Bidirectional Version:
Rotate:
BCF
BTFSS
GOTO
RotateRight:
RRF
BTFSC
BSF
GOTO
RotateLeft:
RLF
BTFSC
BSF
STATUS,C
Direction,0
RotateLeft
Display,f
STATUS,C
Display,7
MainLoop
Display,f
STATUS,C
Display,0
; ensure the carry bit is clear
; Did the bit rotate into the carry?
; yes, put it into bit 7.
; did it rotate out of the display
; yes, put it into bit 0
GOTO
? 2007 Microchip Technology Inc.
MainLoop
DS41296B-page 25
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