Problem with Interrupt

Hi All,

I am working with MPC566. I am using PIT for generating interrupt at 
1 sec. Following is my code :

ISR_function()
{

ReadUART(a);   // reading data from serial port at each sec of 
               // interval       

} 

main()
{

WriteUART(b);  // writing a data to serial port;

ReadUART(c);   // reading data from serial port 

}

Now the problem I am facing is like this:

when "ReadUART(c)" is executing in main loop, then at that time 
interupt is generated and "READUART(a)" from ISR_function is executed.
Because of this,after some time, my code is getting hanged in this 
function "ReadUART(c)" of the main loop, but the interupt for 1 sec 
is still generated and ISR_function is executing.

Can anyone help me on this problem?

-regards
Rajesh










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