AVR MCU timer count-EEWORLD

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#include
#include
#define uchar unsigned char
#define uint unsigned int
uchar num1;
#pragma interrupt_handler miao:9//Its corresponding position
#pragma data:code//Define the program to be stored in ROM
const uchar table[]={
0xc0,0xf9,0xa4,0xb0,0x99,
0x92,0x82,0xf8,0x80,0x90,
0x88,0x83,0xc6,0xa1,0x86,
0x8e
};
/***************************************************/
/*******************Delay subroutine******************/
/***************************************************/
void delay(uchar z)
{
   uchar x,y;
for(x=0;x<255;x++)
for(y=0;y }
/***************************************************/
/***********************Display subroutine******************/
/***************************************************/
void xian(uchar num)
{
  PORTA=table[num/10];//Tens digit
  PORTC&=~BIT(1);
  delay(2);
  PORTC|=BIT(1);
  PORTA=table[num%10];//Ones digit
  PORTC&=~BIT(0);
  delay(2);
  PORTC|=BIT(0);
}
/***************************************************/
/*********************Interrupt service subroutine***************/
/***************************************************/
void miao()
{
    if(num1==60)
num1=0;
num1++;//Increase the variable by 1
TCNT1H=0XA4;//Assign high bit
TCNT1L=0X71;//Assign low bit
}
/***************************************************/
/***********************Main program************************/
/***********************************************/
void main()
{
    DDRA=0XFF;//Set PA port as output mode
DDRC|=BIT(0)|BIT(1);//Set two bits as output mode
TCCR1B=0XA4;//Set 256-division 6M crystal=6000000/256-division-65535 into hexadecimal
TCNT1H=0X71;//Assign high bit
TCNT1L=0XED;//Assign low bit
TIMSK|=BIT(2);//Turn on timer interrupt
SREG|=BIT(7);//Turn on total interrupt
while(1)
{
   xian(num1);
}
}

Keywords：AVR Reference address：AVR MCU timer count

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