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why the code working with PIC16f84a and not in PIC16f877a ? MIKROC & isis proteus

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hi all

i am trying to switch LED in PIC16f877a when i press push button..
it work with PIC16f84a and not in PIC16f877a ...
where is the problem
i build the circuit in isis proteus .... it work for PIC16f84a and not with PIC16f877a ...
333.jpg
Code: 
void main() {
  ADCON1=1;
TRISA=0xff;
TRISB=0;
PORTB=0;

while(1){
if (RA2_bit==0){
PORTB=0xFF;
delay_ms(1000);
}
}
}

where is the Problem

regards for all and thanks in advance...
 

Re: why the code working with PIC16f84a and not in PIC16f877a ? MIKROC & isis proteus

as far as I can remember 16F877A has analog comparator on this pin and you need to disable it first
 
Re: why the code working with PIC16f84a and not in PIC16f877a ? MIKROC & isis proteus

16F877A has an analogue comparator and an ADC. You need to disable them.

Change your code to:
Code: 
void main() {
ADCON1=7; //This disables ADC
CMCON = 7; //This disables analogue comparator
TRISA=0xff;
TRISB=0;
PORTB=0;

while(1){
if (RA2_bit==0){
PORTB=0xFF;
delay_ms(1000);
}
}
}

Hope this helps.
Tahmid.
 
Re: why the code working with PIC16f84a and not in PIC16f877a ? MIKROC & isis proteus

thanks for your support , it works now

regards
 

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