thanks for the replywhat

[Ashutosh Bhatt]

thanks for the reply

what happens in proteus simulator that i tell u

 

if the following code is written to blink the LED then it blinks fine

 

PORTD = (1<<PD0);

_delay_ms(1000);

PORTD = (0<<PD0); 

 

but if the code is

 

PORTD|= (1<<PD0);

_delay_ms(1000);

PORTD| = (0<<PD0);

 

then it stays on. no blinking

 

but again if the code is changed to

 

PORTD|= (1<<PD0);

_delay_ms(1000);

PORTD& = ~(1<<PD0);

 

led starts blinking

so my questions is why and how?