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Low Pin Count Demo Board User’s Guide
3.2.5
Lesson 5: Variable Speed Rotate
Lesson 5 combines Lessons 3 and 4 by using the Analog-to-Digital Converter (ADC)
to control the speed of rotation.
New Instructions
BTFSS
BTFSC
Bit test, skip if set
Bit test, skip if clear
A conversion is run on every pass through the main loop. The result controls the length
of the outer loop (see Example 3-5).
EXAMPLE 3-5:
...
VARIABLE SPEED ROTATE EXAMPLE
BSF
BTFSS
GOTO
MOVF
ADDLW
MOVWF
ADCON0,GO
ADCON0,GO
$-1
ADRESH,w
1
Delay2
;start conversion
;this bit will change to zero when the
;conversion is complete
;Copy the display to the LEDs
A2DDelayLoop
DECFSZ Delay1,f
;Delay Loop shortened by the ADResult as
;controlled by the Pot.
GOTO A2DDelayLoop
DECFSZ Delay2,f
GOTO A2DDelayLoop
FIGURE 3-3:
VARIABLE SPEED ROTATE PROGRAM FLOW
Initialize I/O Port
Initialize ADC
Put Up Display
Get ADC Result
Delay Using ADC
Rotate Display
DS51556A-page 22
Did it overflow?
No
Reset Display
Yes
? 2005 Microchip Technology Inc.
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