STC89LE53RC datasheet(87/165 Pages) STC

Teilenummer	STC89LE53RC

Bauteilbeschribung	Enhanced 80C51 Central Processing Unit ,6T or 12T per machine cycle

PDF	165 Pages

Scroll/Zoom	100%

Hersteller	STC [STCmicro Technology Co,.Ltd]

Direct Link	http://www.stcmicro.com/

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87 / 165 page

C Language Solution

#include <REG51.H>

/* SFR declarations */

sbit

outbit = P1^7;

/* use variable outbit to refer to P1.7 */

unsigned char

R7;

/* use 8-bit variable to represent R7 */

main( )

{

IT0 = 1;

/* negative edge activated */

TMOD = 0x11;

/* 16-bit timer mode */

IE = 0x81;

/* enable EXT 0 only */

while(1);

}

void INT0INT(void)

interrupt 0

{

R7 = 20;

/* 20 x 5000us = 1 second */

TF0 = 1;

/* force timer 0 interrupt */

TF1 = 1;

/* force timer 1 interrupt */

ET0 = 1;

/* begin tone for 1 second */

ET1 = 1;

/* enable timer 1 interrupts */

/* timer interrupts will do the work */

}

void T0INT(void) interrupt 1

{

TR0 = 0;

/* stop timer */

R7 = R7-1;

/* decrement R7 */

if (R7 == 0)

/* if 20

th time, */

{

ET0 = 0;

/* disable itself */

ET1 = 0;

}

else

{

TH0 = 0x3C;

/* 0.05 sec. delay */

TL0 = 0xB0;

}

void T1INT (void) interrupt 3

{

TR0 = 0;

TH1 = 0xFB;

/* count for 400Hz */

TL1 = 0x1E;

outbit = !outbit;

/* music maestro! */

TR1 = 1;

}

STC89LE53RC Datenblatt(PDF) 87 Page - STCmicro Technology Co,.Ltd

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