In my project,I am trying to write some data in to 24c08 serial eeprom. Also a timer 1 interupt subrountie may run at every 1ms to count the run time. Should i set the EA to 0 before access the serial eeprom to prevent data loss. Moreover, if i do so, i think some interupt will be miss and affect the accuracy of the timer. How can i solve this problem? Finally, my programm is code at C. Anyways for me to calculate the system time?