DM163045 Microchip Technology, DM163045 Datasheet - Page 75

• Manufacturer Part Number: DM163045
• Description: PICDEM Lab Development Kit (with PICkit 3) General Purpose
• Manufacturer: Microchip Technology
• Series: PICDEM™r
• Type: MCUr

Specifications of DM163045

• Contents: Board, PIC kit 3
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: PIC Micro® MCU

© 2009 Microchip Technology Inc.
FIGURE 4-7:
The TMR0_ISR() first checks if a Timer0 interrupt has occurred (good programming
practice). If so, then the Timer0 interrupt flag is cleared and Timer1 is turned off to stop
counting the oscillator clock pulses on the T1CKI pin. Next, the 4 MSbs of the Timer1
16-bit result is assigned to the RC0, RC1, RC2 and RC3 pins to light the associated
LEDs. Finally, the Timer1 result register pair are cleared and Timer1 is turned on to
begin a new count.
4.2.6.3
Using the firmware developed in the previous lab, make the following changes:
1. Copy/paste the code in Example 4-4 into the top of the main firmware source file
under the heading labeled:
//----------------INTERRUPT CODE---------------
PROCEDURE
TMR0_ISR FLOWCHART FOR COMPARATOR LAB 3
Assign PORTC the T1MRH value
Clear the Timer1 result register
shifted 4 bits to the right
pair TMR1H:TMR1L
Clear T0IF Flag
Turn off Timer1
Turn on Timer1
TMR0_ISR()
Comparator Peripheral Labs
T0IF = 1
?
YES
NO
Keep PORTC the same
END
DS41369A-page 71