Hello Erik,

Yes. You spotted the problem bang on. The following corrections to the delay routine and T2 ISR, in line with your suggestions solved the problem. The timing is perfect now.

//=============================================
// T2 is set for a 1ms interrupt in auto-reload

void timer2_int(void) interrupt 5 using 2
{
  TF2 = 0;
 
  ++checkCount;
  --msTick_1 ;        // Initialized by msDelay function

  if ( msTick_1==0 )
   {
    DelayOver = 1;   // to flag that the delay has timed out
   }
} 
//==============================================
//Time delay function. Call with required ms delay

 void msDelay (int DelayVal)
{
  msTick_1 = DelayVal;
  DelayOver = 0;
  TR2 = 1;
  while ( !DelayOver ); // Wait for timed out flag from T2 ISR
  msTick_1 = 0;
  TR2 = 0;
} 
//===============================================

Thanks a lot.

Raghu