Hello, I am using an MCB900 evaluation board for philips LPC935FA which uses a clock of 7.373MHz. I wanted a 1 second delay so I loaded timer 0 with these values: TH0=0xF1; TL0=0x99 (I used the code architect to get these values). I then used a counter in the software to count this 1,000 times. This ordinarily should give me 1 second delay after which an LED should be switched on. I have used a stop watch to check the accuracy of the timing and it lags behind by as much as 3 seconds. Could anyone help me as to the reason why this happens. Regards, Ade