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44-Pin Demo Board Lessons
3.2.3
Lesson 3: Rotate (Move the LED)
Building on Lessons 1 and 2, which showed how to light up a LED and then make it
blink with a delay loop, this lesson adds rotation. It will light up DS8 and then shift it to
DS7, then DS6 and on down to DS1, and then back to DS8.
New Instructions
MOVLW
MOVWF
MOVF
RRF
RLF
Note:
Loads WREG with a literal value
Moves the contents of WREG to a file register
Moves the contents of a file register, either to WREG or back into
the file register (see note)
Rotate file register right
Rotate file register left
Moving a file register to itself looks like a NOP at first. However, it has a
useful side effect in that the Z flag is set to reflect the value. In other words,
MOVF fileregister,f is a convenient way to test whether or not the
value is zero without affecting the contents of the WREG.
Rotate Program Flow
?
?
?
?
First, initialize the I/O port and the Display,
Copy the Display variable to the I/O Port, then
Delay for a little while
Rotate the display
FIGURE 3-1:
ROTATE PROGRAM FLOW
Initialize I/O Port
Put Up Display
Delay
Rotate Display
? 2007 Microchip Technology Inc.
Did it overflow?
No
Reset Display
Yes
DS41296B-page 17
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