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PICDEM TM Lab Development Board User’s Guide
FIGURE 3-11:
MAIN() SOFTWARE CONTROL LOOP FLOWCHART FOR
LAB 2
main()
Initialize()
Do_Outputs()
Loop Forever
Timing()
The Timing() delay routine is shown in Figure 3-12.
FIGURE 3-12:
TIMING() DELAY ROUTINE FLOWCHART FOR LAB 2
TIMING()
Create two 8-bit variables:
? delay_var1 = 45571
? delay_var2 = 3
YES
delay_var2 - 1 = 0
?
NO
delay_var1 = 45571
END
YES
NO
delay_var1 - 1 = 0
?
Two variables are used delay_var1 and delay_var2 . The delay_var2 is decre-
mented by 1 each time delay_var1 is decremented from 45571 to 0. These values
have been determined through trial and error using a test procedure detailed in the
“Timers: Timer0 Tutorial (Part 1)” (DS51682.pdf) included on the PICDEM? Lab
Development Kit CD. This delay ties the up the processor for 1 second when using the
4 MHz internal oscillator.
The Initialize() configures the PORTC as follows:
? PORTC
- Set all bits in the PORTC register HIGH
- Configure all PORTC pins as digital outputs
DS41369A-page 26
? 2009 Microchip Technology Inc.
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