CodePudding user response:

P0.3 wrong

CodePudding user response:

Should be AT89C51 egg chicken, this is a very simple program, probably by hand,

 
Sbit k1=p0 ^ 0; 
... 
The main () 
{
While (1) 
{
if(! K1) p1=255; 
if(! K2) p1=0; 
if(! K3) p1=15; 
if(! K4) p1=240; 
} 
} 

CodePudding user response:

Karnaugh map simplification of logic, several conditions on the switch