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General Purpose Input/Output Labs
EXAMPLE 3-9:
INITIALIZE() CODE FOR LAB 3
//Set all PORTC bits HIGH (to a known state)
PORTC = 0b11111111;
//Configure PORTC's ANALOG/DIGITAL pins as all Digital
ANS4 = 0;//Associated with RC0
ANS5 = 0;//Associated with RC1
ANS6 = 0;//Associated with RC2
ANS7 = 0;//Associated with RC3
ANS8 = 0;//Associated with RC6
ANS9 = 0;//Associated with RC7
//Configure PORTC
//i.e. 1 = Input,
TRISC0 = 0;//Make
TRISC1 = 0;//Make
TRISC2 = 0;//Make
TRISC3 = 0;//Make
TRISC4 = 0;//Make
TRISC5 = 0;//Make
TRISC6 = 0;//Make
TRISC7 = 0;//Make
pins as all output
0 = Output
RC0 (pin 16) output
RC1 (pin 15) output
RC2 (pin 14) output
RC3 (pin 7) output
RC4 (pin 6) output
RC5 (pin 5) output
RC6 (pin 8) output
RC7 (pin 9) output
//Configure Timer0 as follows:
T0CS = 0; //Use the internal instruction clock
//FOSC/4 as the clock source
T0SE = 0;//Increment TMR0 on low-to-high
//FOSC/4 transition
PSA = 0;//Assign the prescaler to
//Timer0
//Configure Timer0 prescaler to increment
//TMR0 every 256 FOSC/4 clock transitions
PS0 = 1;
PS1 = 1;
PS2 = 1;
3. Finally, copy/paste the code in Example 3-10 into the Timing() over the code
from the previous lab
EXAMPLE 3-10:
TIMING() CODE FOR LAB 3
Delay_1S(); //Call the 1 second delay
4. The remaining code from the previous lab remains the same. Compile the proj-
ect. There should be no errors.
3.3.6.4
TESTING THE APPLICATION
Program the PIC16F690. The application should behave exactly as it did in the
previous lab. Using an oscilloscope to test individual PORTC pin level transitions would
be useful to analyze the accuracy of the delay.
The solution for this project is located in the
C:\PICDEM_Lab\GPIO_Labs\GPIO_Lab3\solution directory .
Note:
? 2009 Microchip Technology Inc.
More in-depth tutorials on the Timer0 peripheral are covered in “Timers:
Timer0 Tutorial (Part 1)” (5162a.pdf) and “Timers: Timer0 Tutorial (Part 2)”
(51702a.pdf) files included on the PICDEM? Lab Development Kit CD.
DS41369A-page 33
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