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Comparator Peripheral Labs
FIGURE 4-2:
MAIN() SOFTWARE CONTROL LOOP FLOWCHART FOR
COMPARATOR LAB 1
main()
Initialize()
Loop Forever
Wait
As mentioned in the introduction, comparators on the PIC16F690 are able to function
independent of software logic. Therefore, all that is needed is to call the
Initialize() from main() to activate the peripheral. The Initialize()
configures Comparator 1 as follows:
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Turn on Comparator 1
Make the Comparator 1 output available on the C1OUT pin
Select pin C1IN+ as the non-inverting reference
Select pin C12IN0- as the inverting reference
Configure the C1OUT pin as an output
4.2.4.3
PROCEDURE
Using the Project Wizard, create a new project using the PIC16F690 entitled
Comparator_Lab1.mcp as was done in previous labs. Once completed, open the
Comparator_Lab2.c source file in MPLAB and do the following:
1. Copy/paste the code in Example 4-1 into the Initialize() section labeled:
//ADD INITIALIZE CODE HERE
EXAMPLE 4-1:
INITIALIZE CODE FOR COMPARATOR LAB 1
//Initialize Comparator 1 as follows:
//Turn comparator 1 on
C1ON = 1;
//Make the comparator output available on the
//C1OUT pin
C1OE = 1;
//Select the non-inverting pin (C1IN+) as the
//non-inverting reference input for the comparator 1
C1R = 0;
//Select the C12IN0- pin as the inverting reference
C1CH0 = 0;
C1CH1 = 0;
//Since the comparator 1 output shares the same pin
//as PORTA bit 2, configure the corresponding TRISA2 bit
//as an output
TRISA2 = 0;
? 2009 Microchip Technology Inc.
DS41369A-page 63
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