设MCS-51的单片机时钟频率为12Mhz请编写程序在P1.7脚输出周期为1s,脉宽为1ms的脉 设MCS-51单片机时钟为12MHz,利用定时器T0编辑令P...
\u8bbemcs-51\u5355\u7247\u673a\u4e2d\uff0c\u6676\u632f\u9891\u7387\u4e3a12mhz\uff0c\u7f16\u7a0b\u5b9e\u73b0\u4f7fp1.0\u548cp1.1\u5206\u522b\u8f93\u51fa\u5468\u671f\u4e3a2ms\u548c5ORG 0000H
LJMP MAIN
ORG 000BH
LJMP T0ISR
ORG 0030H
MAIN:
MOV TMOD,#01H
MOV TH0,#HIGH(65536-250)
MOV TL0,#LOW(65536-250)
SETB TR0
SETB ET0
SETB EA
MOV R2,#0
SJMP $
T0ISR:
CLR TR0
MOV TH0,#HIGH(65536-250)
MOV TL0,#LOW(65536-250)
SETB TR0
CPL P1.1
INC R2
CJNE R2,#4,T0E
CPL P1.0
MOV R2,#0
T0E:
RETI
END
#include
#define OUT P1_0
void InitT0(void)
{
TMOD = 1;
TH0=(65536-1000)/256; //\u673a\u5668\u5468\u671f1us 1000us=1ms
TL0=(65536-1000)%256;
ET0=1;
TR0=1;
EA=1;
}
void main(void)
{
InitT0();//\u521d\u59cb\u5316\u5b9a\u65f6\u5668
while(1);
}
void Timer0Interrupt(void) interrupt 1 //\u6bcf1ms\u4e2d\u65ad\u4e00\u6b21
{
TH0=(65536-1000)/256;
TL0=(65536-1000)%256;
OUT=~OUT; //2ms\u5468\u671f\u65b9\u6ce250%\u5360\u7a7a\u6bd4
}
#include<reg51.h>
#define uchar unsigned char
sbit pluse=P1^7;
void delay(int a)
{
uchar i;
while(a--)for(i=0;i<120;i++);
}
main()
{
while(1)
{
pluse=1;
delay(1);
pluse=0;
delay(999);
}
}
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绛旓細T=1/f=50US void Timer0Init(void)//100寰@12MHz { AUXR &= 0x7F;//瀹氭椂鍣鏃堕挓12T妯″紡 TMOD &= 0xF0;//璁剧疆瀹氭椂鍣ㄦā寮 TL0 = 0x9C;//璁剧疆瀹氭椂鍒濆 TH0 = 0xFF;//璁剧疆瀹氭椂鍒濆 TF0 = 0;//娓呴櫎TF0鏍囧織 TR0 = 1;//瀹氭椂鍣0寮濮嬭鏃 } 涔嬪悗鍦ㄤ腑鏂噷鍐欏叆P01=~P01; 灏卞ソ浜 ...
绛旓細include <reg51.h>void InitTimer1(void){ TMOD = 0x10;//瀹氭椂鍣1 鏂瑰紡1 TH1 = 0x3C;//12Mhz鏅舵尟锛屽畾鏃50ms TL1 = 0x0B0; EA = 1; ET1 = 1; TR1 = 1;}void main(void){ P1=0xff; InitTimer1(); while(1);}void Timer1Interrupt(void) interrup...
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