pdown.c

8051试验程序 基础教材

//********************************************************************
//
// Author        : ADI - Apps            www.analog.com/MicroConverter
//
// Date          : October 2003
//
// File          : PDown.c
//
// Hardware      : ADuC842/ADuC843
//
// Description   : Demonstrates a use of a timer interval counter to
//		wake the ADuC842 out of Power down mode after a user
//		specified Power down time.
//
//		The LED will, on power up, flash at 5Hz. After 5s
//		the ADuC842 will enter power down mode (the LED will
//		stop flashing in the off position).
//		
//		By pressing the external interrupt 0 button (INT0) or
//		when the user specified time runs out (20s in this
//		example) the ADuC842 will wake up and continue
//		blinking as before for 5s before entering power down
//		mode again.
//
//********************************************************************

#include <stdio.h>
#include <ioADuC842.h>

#define adcled P3_bit.P33
#define LED P3_bit.P34		//P3.4 drives red LED on eval board

void DELAY(int);


#pragma vector=extern0
__interrupt void int0 ()
{		
}

#pragma vector=TII_int
__interrupt void TIC_int ()
{		
}

void main (void)
{
	int i;
	IEIP2 = 0xA4;
	TCON_bit.IT0 = 1;
	IE_bit.EX0 = 1;
	IE_bit.EA = 1;

	while(1)
	{
   		for(i=0;i<50;i++)
		{
		DELAY(17000);
		LED ^= 1;
		}
			INTVAL = 0x14;
			TIMECON = 0x13;
        	LED = 1;
        	PCON = 0x22;

        	TIMECON = 0x00;
	}
}

void DELAY(int length)
{
while (length >=0)
    length--;
}