What is the problem in the code?

Question

C++ / C#

#include <mega8.h>
#include <delay.h>

int z=0;

void main(void)
{
    DDRB = 0b0000000;
    PORTB = 0b0000001;
    
    DDRD = 0b0000111;
    PORTD = 0b0000000;
    
    
    while (1)
    {   
        if (PINB==0b0000000)
        {   
            
            TCCR0 = 0b00000101; 
            TCNT0 = 0
            
            while (z < 21) 
            {   
                if (TCNT0 == 255) 
                {
                    z++;    
                };
    
            };
            
            TCNT0 = 0;
            TCCR0 = 0b00000000;
            PORTD=0b00000111;
            _delay_ms(1000)
        };
        
        if (PINB==0b0000001)
        {
            PORTD=0b00000000;  
        };
    };
};

In short, port b0 is for input with a pull-up, ports d are 3 pieces for output, I announce it, then in an endless loop, I announced the frequency of the zero timer of the handkerchief, reset its memory cell, and until z becomes 1024/1000000*255*20 seconds, we wait, then we reset the timer just in case, all of a sudden we will use the code below, turn on 3 LED idiots and, in essence, in

Russian speaking, pressed the button, waited for about 5.2 s, the lights came on for 1000 ms, checked that you had already released the button and went out)

The code does not work in the proteus and throws errors, searched for an error on the Internet and did not find anything shameful in the code

Answer 1

until z becomes 1024/1000000*255*20 seconds wait

while (z < 21) 
{   
    if (TCNT0 == 255) 
    {
        z++;    
    };
};

Speaking in Russian, I pressed the button and waited for about 5.2 s

No, you waited some other time here. Because if clk _io / 1024 enters the timer, then TCNT will be equal to 255 for far more than one cycle.

The code does not work in proteus and throws errors

Well, he writes you the address, PC=0x005e, look what happens at this address.

Answer 2

To eat, in English on white it is written what is the problem :) Writing to the memory area at the address ... outside the selected area. The area is either small or the pointer is set incorrectly.