немогу понять как расчитать таймер на 1сек (при этом в какой регистр он пишет при переполнении)
/*****************************************************
This program was produced by the
CodeWizardAVR V2.05.5a Evaluation
Automatic Program Generator
© Copyright 1998-2011 Pavel Haiduc, HP InfoTech s.r.l.
http://www.hpinfotech.comProject :
Version :
Date : 18.12.2011
Author : Freeware, for evaluation and
non-commercial use only
Company :
Comments:
Chip type : ATtiny13
AVR Core Clock frequency: 4,800000 MHz
Memory model : Tiny
External RAM size : 0
Data Stack size : 16
*****************************************************/
#include <tiny13.h>
#include <delay.h>
int get,but;
// Timer 0 overflow interrupt service routine
interrupt [TIM0_OVF] void timer0_ovf_isr(void)
{
// Place your code here
}
#define ADC_VREF_TYPE 0x20
// Read the 8 most significant bits
// of the AD conversion result
unsigned char read_adc(unsigned char adc_input)
{
ADMUX=adc_input | (ADC_VREF_TYPE & 0xff);
// Delay needed for the stabilization of the ADC input voltage
delay_us(10);
// Wait for the AD conversion to complete
while ((ADCSRA & 0x10)==0);
ADCSRA|=0x10;
return ADCH;
}
// Declare your global variables here
void main(void)
{
// Declare your local variables here
// Crystal Oscillator division factor: 1
#pragma optsize-
CLKPR=0x80;
CLKPR=0x00;
#ifdef _OPTIMIZE_SIZE_
#pragma optsize+
#endif
// Input/Output Ports initialization
// Port B initialization
// Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State5=T State4=T State3=T State2=T State1=T State0=T
PORTB=0x00;
DDRB=0x1C;
// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: 600,000 kHz
// Mode: Normal top=0xFF
// OC0A output: Disconnected
// OC0B output: Disconnected
TCCR0A=0x00;
TCCR0B=0x02;
TCNT0=0x00;
OCR0A=0x00;
OCR0B=0x00;
// External Interrupt(s) initialization
// INT0: Off
// Interrupt on any change on pins PCINT0-5: Off
GIMSK=0x00;
MCUCR=0x00;
// Timer/Counter 0 Interrupt(s) initialization
TIMSK0=0x02;
// Analog Comparator initialization
// Analog Comparator: Off
ACSR=0x80;
ADCSRB=0x00;
DIDR0=0x00;
// ADC initialization
// ADC Clock frequency: 600,000 kHz
// ADC Bandgap Voltage Reference: Off
// ADC Auto Trigger Source: Timer0 Overflow
// Only the 8 most significant bits of
// the AD conversion result are used
// Digital input buffers on ADC0: On, ADC1: On, ADC2: On, ADC3: On
DIDR0&=0x03;
DIDR0|=0x00;
ADMUX=ADC_VREF_TYPE & 0xff;
ADCSRA=0xA3;
ADCSRB&=0xF8;
ADCSRB|=0x04;
// Global enable interrupts
#asm("sei")
while (1)
{
get = PINB.0;
but = get;
get = PINB.0;
if (get != but)
{
PORTB.2 = 1;
PORTB.3 = 1;
PORTB.4 = 1;
delay_ms(100);
}
else
{
PORTB.2 = 0;
PORTB.3 = 0;
PORTB.4 = 0;
}
}
}
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