Getting Started

Chapter 7: Microcontroller Interrupts and Timers

// Sets the compare value

mer Compare (CTC) mode, CLK/8 prescaler

<WGM00)|(1<<CS01);

ARE0)

erfly (remembering to browse to the correct

100

u rec

viding a 500

z puls 3.90625 Hz. pulse on LED7.

set_OCR0A(count);

// Set Clear on Ti
TCCR0A = (1<<WGM01)|(0<

}

void set_OCR0A(unsigned char count)
{
// Sets the compare value
OCR0A = count;
}

// Interrupt occurs once per millisecond
SIGNAL(SIG_OUTPUT_COMP
{
PORTD = milliseconds++;
}

Compile it and download to the Butt
directory).

Using Precision Blinking:

In HyperTerminal you will see:
PC_Comm.c ready to communicate.
You are talking to the Precision Blinking demo.

Type in:
ctc

Yo eive:
Setting the Compare Timer Count to: 100

Note that a ctc value of 250 resets the interrupt to 1 millisecond pro
H e on LED0 and a