Hi, I have written an application for the 8051 based Infineon C515C-L mikrocontroller. While testing the application with the simulator of uVision2 a problem arises with the programmed timer interrupt requests. I have programmed timer0 in such a manner, that it requests every 10ms an interrupt. My system clock does not work correctly, as the timer interrupt is requested in less than 10ms. And by the way i have noticed that the timer interrupt is requested every 1ms. I am working in timer0 Mode 1. The system clock of the C515C-L is 10 MHz. And the timer is run by an 1/6 of the system clock. PS: The value each time i reload the timer with was examined by many collegeus and it is to 99,999% correct. Thanks!! Best regards Hammoud