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General Purpose Input/Output Labs
The Decide() first checks the current value in LED_Output for two specific condi-
tions:
? Is the Most Significant bit ‘ 1 ’? This means that on the next shift, the contents will
be all ‘ 0 ’s.
? Is the value currently a ‘ 0 ’?
If either condition exists, the function re-initializes LED_Output to set the Least Signif-
icant bit. Otherwise, there will be a period when none of the LEDs are lit.
The shift is implemented in code as follows:
LED_Output <<= 1;
This translates to: “ LED_Output is equal to the current contents of LED_Output
shifted to the left by 1 bit position”
Conversely, to shift the bit to the right the code would be as follows:
LED_Output >>= 1;
The Do_Outputs() will then assign the contents of the LED_Output variable to the
PORTC register and whichever bit is high will light the connected LED. (See
Figure 3-17.)
FIGURE 3-17:
RESULTS OF DO_OUTPUT()
First time through main():
LED_Output variable
PORTC
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
Do_Outputs()
Initialize() determines initial
contents of LED_Output
assigns
LED_Output to
PORTC
Corresponding LED lights
Next time through main():
LED_Output variable
PORTC
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
Do_Outputs()
Decide() shifts contents of
LED_Output Left by 1 bit position
assigns
LED_Output to
PORTC
Corresponding LED lights
The Initialize() now configures the PIC16F690 peripherals as follows:
? PORTC
- Initialize PORTC so that the 7 Most Significant bits are ‘ 0 ’ and the Least
Significant bit is ‘ 1 ’
- Make all PORTC pins digital output
? Timer0
- Use the internal instruction clock (F OSC /4) as the TMR0 register clock source
- Increment TMR0 register on low-to-high transition of F OSC /4
- Assign the prescaler to Timer0 and configure to increment on every 256th
transition of F OSC /4
? Initialize the LED_Output variable to ‘ 0 ’
? 2009 Microchip Technology Inc.
DS41369A-page 35
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