DM163035【PDF 77/96 页】KIT DEVELOPMENT PICDEM LAB

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Comparator Peripheral Labs

EXAMPLE 4-5:

INITIALIZE CODE FOR COMPARATOR LAB 3

//Configure RC0,RC1,RC2 and RC3 as digital outputs

ANSEL = 0b00001111;

PORTC = 0;

TRISC0 = 0;

TRISC1 = 0;

TRISC2 = 0;

TRISC3 = 0;

//Initialize PORTA pin connected to C12IN0-

TRISA1 = 1;

//Make C1OUT pin an output

TRISA2 = 0;

//Configure the Comparator 1 as follows:

//Turn on comparator 1

C1ON = 1;

//Make C1OUT available externally

C1OE = 1;

//Connect the non-inverting reference to CVREF

C1R = 1;

//Connect the inverting reference to C12IN0-

C1CH0 = 0;

C1CH1 = 0;

//Configure the CVREF as follows:

//Route CVREF output to Comparator 1 non-inverting reference

VRCON = 0;

//Enable the 0.6V fixed reference voltage

VP6EN = 1;

//Configure Timer1 as follows

//Make T1CKI and input

TRISA5 = 1;

T1CON = 0;

//Select T1CKI as Timer1's clock source

TMR1CS = 1;

//Initialize the 16-bit Timer1 register pair to 0

TMR1H = 0;

TMR1L = 0;

//Turn on Timer1

TMR1ON = 1;

//Set up Timer0 as follows:

//Use FOSC/4 for Timer0 Clock Source

OPTION = 0;

T0CS = 0;

//assign the prescaler to TMR0

PSA = 0;

//set up prescaler for 1:256

PS0 = 1;

PS1 = 1;

PS2 = 1;

//Enable Timer0 Interrupts

T0IE = 1;

//Clear the Timer0 overflow interrupt flag

T0IF = 0;

//Preload TMR0 with 10 to keep overflow period

//less than Timer1 overflow period

TMR0 = 10;

//Enable global interrupts

GIE = 1;

? 2009 Microchip Technology Inc.

DS41369A-page 73

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