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General Purpose Input/Output Labs
FIGURE 3-9:
PICkit 2 PROGRAMMER/DEBUGGER TOOLBAR
1
2
3
4
5
6
7
8
9
Legend:
1.
2.
3.
4.
5.
6.
7.
8.
9.
Program the target device
Read target device memories
Read the target EEDATA memory
Verify the contents of the target device
Erase the target device memories
Verify that target memories are erased
Bring target MCLR to V DD
Bring target MCLR to V IL
Re-establish PICkit 2 connection
8. Press button1 shown in Figure 3-9 to program the PIC16F690.
3.3.4.4
TESTING THE APPLICATION
Once programmed, the LEDs connected to the individual PORTC pins should now
resemble the output shown in Figure 3-10.
FIGURE 3-10:
LAB 1 LED OUTPUT
R8
470 ?
LED8
R7
470 ?
LED7
R6
470 ?
LED6
R5
470 ?
LED5
R4
470 ?
LED4
R3
470 ?
LED3
R2
470 ?
LED2
R1
470 ?
LED1
LED ON
LED OFF
V SS
The solution for this project is located in the
C:\PICDEM_Lab\GPIO_Labs\GPIO_Lab1\solution directory .
3.3.5
3.3.5.1
Lab 2: Flash LEDs (Delay Loop)
OVERVIEW
This lab implements a software delay to flash the LEDs connected to the PORTC pins
on/off in 1 second intervals. As configured, the PIC16F690 executes 1 million instruc-
tions per second. At this rate, the software loop execution needs to be slowed down so
that the LED flashing is visible to the eye. This is done using a delay routine within the
Timing() functional block called from the main() software control loop as shown in
Figure 3-11.
? 2009 Microchip Technology Inc.
DS41369A-page 25
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