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 在8051单片机的时钟频率为12MHz，用T0定时，试编程使...
\u8bbeMCS-51\u7684\u5355\u7247\u673a\u65f6\u949f\u9891\u7387\u4e3a12Mhz\u8bf7\u7f16\u5199\u7a0b\u5e8f\u5728P1.7\u811a\u8f93\u51fa\u5468\u671f\u4e3a1s,\u8109\u5bbd\u4e3a1ms\u7684\u8109#include#define uchar unsigned charsbit 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); }}
\u6709\u5f88\u591a\u65b9\u6cd5\u7684\uff0c\u7b2c\u4e00\u79cd\u662f\u7528\u6a21\u62dfPWM,\u8bbe\u7f6e\u597d\u5360\u7a7a\u6bd4\u4e3a1/2\uff0c\u6839\u636e\u5468\u671f\u8bbe\u5b9a\u597d\u9891\u7387\u5c31\u53ef\u4ee5\u4e86\uff0c\u4f60\u8fd9\u4e2a\u4e0d\u9700\u8981\u53d8\u52a8\u7684\u8bdd\uff0c\u4e0d\u7528PWM\u4e5f\u53ef\u4ee5\uff0c\u53ef\u4ee5\u8fd9\u6837\u5199\uff1a
#define T0_delay 1000
sbit P10=P1^0;
sbit P11=P1^1;
unsigned int Pwm_Count=0;
void Timer0_init();
void main()
{
Timer0_init();
while(1);//\u7a7a\u5faa\u73af
}
void Timer0_init()
{
TMOD |=0x01; //\u91c7\u752816\u4f4d\u5b9a\u65f6\u5668
TH0 = (65536-T0_delay)/256; //\u5b9a\u65f6\u5668\u88c5\u521d\u503c1000
TL0 = (65536-T0_delay)%256;
EA=1;
ET0=1;
TR0=1;
}
void timer0() interrupt 1
{
TH0 = (65536-T0_delay)/256; //\u88c5\u521d\u503c1000\uff0c1ms\u4e2d\u65ad\u4e00\u6b21
TL0 = (65536-T0_delay)%256;
P10=~P10;//\u53d6\u53cd\uff0c1ms\u540e\u7535\u5e73\u53d8\u6362\uff0c\u8f93\u51fa\u5468\u671f\u4e3a2ms\u7684\u65b9\u6ce2
Pwm_Count++;//\u8ba1\u6570
if(Pwm_Count==250)
{
Pwm_Count=0;//\u5f52\u96f6\uff0c\u4e0b\u6b21\u91cd\u65b0\u4ece\u96f6\u5f00\u59cb\u7d2f\u52a0\u8ba1\u6570
P11=~P11;//\u53d6\u53cd\uff0c250ms\u7535\u5e73\u8f6c\u6362\u4e00\u6b21\uff0c\u8f93\u51fa\u65b9\u6ce2
}
}
\u8981\u91c7\u7528\u6a21\u62dfPWM\u51fd\u6570\u7684\u8bdd\uff0c\u53ef\u4ee5\u8fd9\u6837\u5199\uff1a
\u5b9a\u65f6\u5668\u88c51ms\u7684\u521d\u503c\uff08\u540c\u4e0a\uff09
#define LED_ON 1
#define LED_OFF 0
\u4e3b\u8981\u4ee3\u7801\u5982\u4e0b\uff1a
P10=~P10;
//---------------------------------------------------------------------
Pwm_Count_500 ++;
if(Pwm_Count>500)
{
Pwm_Count_500 =0;
}
(Pwm_Count _500< 250)?(P11= LED_ON):(P11= LED_OFF);//\u95ee\u53f7\u8bed\u53e5\u6765\u4ee3\u66ffif\u8bed\u53e5\uff0c\u66f4\u4e3a \u7b80\u6d01\u4e00\u70b9\uff0c\u5b9e\u6548\u4e0a\u6d4b\u8bd5\u4e24\u8005\u8017\u65f6\u76f8\u540c\uff0c\u591a\u8def\u65f6\u8017\u65f6\u6bd4if\u66f4\u77ed\uff0c\u4ee3\u7801\u5360\u6709\u7a7a\u95f4\u5728\u591a\u8defPWM\u65f6\u95ee\u53f7\u8bed\u53e5\u660e\u663e\u53ef\u4ee5\u5360\u66f4\u5c11\u7a7a\u95f4\u3002\u8fd9\u4e9b\u65b9\u9762\u4e5f\u8bb8\u662f\u6807\u51c6C\u5e93\u51fd\u6570\u5728\u5b9e\u73b0\u6bd4\u8f83\u4e24\u4e2a\u6570\u5927\u5c0f\u65f6\u91c7\u7528\u95ee\u53f7\u8bed\u53e5\u7684\u539f\u56e0\u4e4b\u4e00\u3002
#include<reg51.h>
#define uchar unsigned chr
#define uint unsigned int
uint cnt;
sbit pluse=P1^7;
void t0isr() interrupt 1
{
TH0=(65536-1000)/256;
TL0=(65536-1000)%256;
cnt++;
cnt%=1000;
if(cnt<1)pluse=1;
else pluse=0;
}
main()
{
TMOD=0x01;
TH0=(65536-1000)/256;
TL0=(65536-1000)%256;
TR0=1;
ET0=1;
EA=1;
while(1);
}
153
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绛旓細2ms鍛ㄦ湡鏂规尝锛1:2鍗犵┖姣旂殑璇濆緱涓嶅埌绮剧‘鍊笺侽RG 0000H LJMP MAIN ORG 000BH LJMP T0ISR ORG 0030H MAIN:MOV TMOD,#02H MOV TH0,#246 MOV TL0,#246 SETB TR0 SETB ET0 SETB EA SETB P1.0 CLR A SJMP T0ISR:INC A CJNE A,#67,T01 T01:JC T02 CLR P1.0 CJNE A,#200,T03 T03...
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...
绛旓細閲囩敤12Mhz鏅舵尟鐨51鍗曠墖鏈锛岃蒋浠跺涓嬶紙璋冭瘯閫氳繃锛塱nclude <reg52.h> define PERIODH (65536l-50000l)/0X100 //璁50ms涓柇1娆H1鍒濆 define PERIODL (65536l-50000l)%0X100 //璁50ms涓柇1娆L1鍒濆 //濡傛灉闇瑕佹瀬绮剧‘鐨勫欢鏃讹紝搴旀牴鎹疄闄呯紪璇戝悗鐨勪骇鐢熺殑姹囩紪鎸囦护锛屾墸闄ゆ帀涓柇鍝嶅簲涓噸瑁呮墍鍗犵敤鐨...
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