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51 core microcontroller on time Calculation of the processor (taking 12M crystal oscillator as an example); Crystal oscillator 12MHz =12000000Burundins EscortHz clock cycle 1/12000000 s (reciprocal of the crystal oscillator) The mechanical cycle is 12/12000000 s (a mechanical cycle of 51 microcontroller in the scale framework is 12 clock cycles) due to the timer Each mechanical cycle adds 1, so the timing time is N*clock mechanical cycle time=pressed time T, so the mechanical period to go through is N*(12/12000000 s)=T N=t/(12/12000000) Initial value Equal to 65536-N (because the 16-bit timer 65535 overflows by adding 1) For example: Required time 1ms=0.001s = time (s)*(crystal oscillator/12) 0.001/(12/12000000)=0.001*( 12000000 /12)=0.001*1000000=1000 Initial value y=65536-1000=64536=0XFC18

#include "reg52.h"#define uchar unsigned char#define uint unsigned int#define SEG P0sbit SCAN1 = P2^0;sbit SCAN2 = P2^1;sbit SBurundi SugarCAN3 = P2^2;sbit SCAN4 = P2^3;sbit key = P3^0;sbit Bepp = P3^7;uchar number;uchar flag ;uchar distab[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};int display=0;//Nigital tube refresh int The_Time;//Display time unit 10msint dis_value;/ /Counting frequency 10msvoid delay(uint j) //1ms uchar Burundins Sugardaddyi=250; for(;j>0;j-- ) while(--i); iBurundi Sugar=249; while(--i); i=250;
 TMOD |=Burundins Sugardaddy 0x01; //Turn on timer 0. Use timer 1 at 0x10 and start two TH0=0XFC at 0x11 ; //Assign an initial value to the timer, 1ms TH1 TL0Burundins Escort=0X18; //TL1 EA=1; / /Always stop opening ET0=1; BI Escorts//Timer 0 stops opening ET1 TR0=1; //Timer TR1 EX0=1; //Internal interrupt 0 is on () EX1 is internal interrupt 1 (P3^3)IT0=1; //Low level trigger IT1 is interrupt 1 while(1)
 static uint i; //Define a self-deformable variable TH0=0XFC; //Assign an initial value to the timer, time 1ms TH1 TL0=0X18; //TL1 i++; dis_value++; if(i==2) i=0; SEG = 0XFF; switch(number) case 0:SCAN4=1;SCAN3=0;SCAN2=0;SCAN1=0; SEG=distab[The_Time%10];break; case 1:SCBI EscortsAN4=0;SCAN3=1;SCAN2=0; SCAN1=0;;SEG=distab[The_Time/10%10];break; case 2:SCBurundi Sugar DaddyAN4=0; SCAN3=0;SCAN2=1;SCAN1=0;SEG=distab[The_Time/100%10] break; case 3:SCAN4=0;SCAN3=0;SCAN2=0;SCAN1=1;;SEG=distab[The_Time/ 1000];break; default:break; number++; if(number>3)number=0;
 Burundi Sugar【Open source Sao Ke] Lecture 3 of "Easy Design SDRAM Controller" - Serial Port Transmitting Module Design and Transceiver Integration. I believe that many friends will definitely want to learn after studying the serial port receiving module mentioned in the second lecture Burundi Sugar Daddy How to design the serial port sending module? Kevin is also very aware of everyone’s diligence in learning, so in the third lecture, Kevin will take everyone together. The design of the serial port sending module is completed and will be issued on 05-08 22:18 
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