Sixteen system counter and flow lamp

51 do Sixteen system counter and water lamp

Notes

This article focuses on the use of 51 Single chip timer interrupt , And in proteus Code to pay attention to in simulation .

Reference resources ： Timer use demo,proteus Simulation

Hexadecimal counter

Subject requirements ： use P0.0- P0.03 Design one in 0-15 A hexadecimal counter that automatically counts between , Hold each value 0.2s.

Code

#include<reg52.h>
void Timer0Init(void)		//20 Microsecond @12.000MHz
{
    
	TMOD = 0x02;		// Set timer mode 
  TL0 = 0x10;		// Set initial value of timing 
	TH0 = 0x10;		// Set time overload value 

	EA=1;			// General interruption 
	ET0=1;			// On timer interrupt 
	TR0=1;			// Start timer 0
    
	TF0 = 0;		// eliminate TF0 sign 
	TR0 = 1;		// Timer 0 Start timing 
}

int num=0;
int cnt=0;
void T0_time() interrupt 1
{
    
  ++num;
	if(num==10000) 
	{
    
		num=0;
		cnt=(cnt+1)%16;
		P0=cnt;
	}
}

void main()
{
    
	Timer0Init();
	while(1);
}

Circuit diagram

Code interpretation

setp1： The timing part of the code can use stc-isp Generate , But it needs to be revised

step2:

. however AUXR Is an extended register , yes 51 The enhanced version of , and proteus There is no , So delete this line .

step3： Add interrupt

（from In the manual 8 Bit auto reassembly ）

Know to open interrupt 1, add to

EA=1;			// General interruption 
ET0=1;			// On timer interrupt 

step4： Calculation 0.2s from How many? $20\mu s$ form

use 8 Bit automatic overload generation 10 Microsecond interrupt .
$$\begin{gathered} 1\mu s=10^{-6}s \\ 1ms=10^{-3}s \\ becausethis0.2s=200ms=2\ast 10^5\mu s=10^4\ast 20\mu s \end{gathered}$$

Running water lamp

Code

#include<reg52.h>

void delay(int a)
{
	a=a*10;
	while(a--);
}


void main()
{
	int cnt=0;
	int arr[]={1,2,4,8,16,32,64,128};
while(1)
{
		P0=arr[cnt];
		cnt=(cnt+1)%8;
		
		delay(1000);
}

}

easy, Don't explain

On the basis of the above, a row of lights is added , The general drawing is

miscellaneous （ Don't look ）

stc89c51 and AT89C51 difference ？

They are collectively referred to as 51 Single chip microcomputer

Why does the textbook learn 15 Single chip microcomputer , And it uses 51 Single chip microcomputer .、

SCM manual can be divided into stc Look for

Reference blog ： Portal 1- Speaking of the external memory part

The teacher used a bread board to 15 Single chip microcomputer 4 Modes to test ,

Under different solutions and outputs , Observe led The light and dark of the lamp know the current of different modes .

STC15F2K60S2 All of SCM I/O Every mouth has 4 Working mode ：： Quasi two-way port （ Tradition 8051 Single chip microcomputer I/O Pattern ）、 Push pull output 、 Input only （ High resistance state ） And open drain mode

however proteus I won't support it 15 SCM simulation , and 51 SCM is an ancient SCM , Only quasi two-way port is used for this output mode （ It is a common open drain output plus pull ） Therefore, it is impossible to proteus Test this 4 The effects of these modes .

Small .

STC15F2K60S2 All of SCM I/O Every mouth has 4 Working mode ：： Quasi two-way port （ Tradition 8051 Single chip microcomputer I/O Pattern ）、 Push pull output 、 Input only （ High resistance state ） And open drain mode

however proteus I won't support it 15 SCM simulation , and 51 SCM is an ancient SCM , Only quasi two-way port is used for this output mode （ It is a common open drain output plus pull ） Therefore, it is impossible to proteus Test this 4 The effects of these modes .