Lpc2000

To Whom It May Concern:
I've been having problems with a variable of type "long long" 
reading back an incorrect value. I'm using 2 external interrupts to 
generate binary data (0's and 1's). That data gets saved to a 
variable which when read back is incorrect unless a while loop with 
a considerable delay time is inserted before accessing the variable.

Suggested has been to use an ISR "wrapper" in which you call a 
function from an ISR. Tried that; did not help. Could the "long 
long" data type be an issue? Code is as follows; card_data is 
incorrect when trying to read it at statement store_card_data =...
By the way, the following is part of main() routine, not called from 
an ISR.

void process_Card()
{
if(card_bits == 26)
{
 store_card_data = ((card_data & 0xFFFFFFC000000000) >> 38);
 site_code = (char)((store_card_data & 0x0000000001FE0000) >> 17);
 card_num = (long long)((store_card_data & 0x000000000001FFFE) >> 1);
}

else if(card_bits == 37)
{
  store_card_data = card_data;
}

card_data = 0;
card_bits = 0;
}