i have a problem about PIT interrupt in mp3 project In the systime.c #define TCK 1000 /* Timer Clock */ #define PIV ((MCK/TCK/16)-1) /* Periodic Interval Value */ in the board: #define MCK 48054857 so the PIV value is 3003.7 hz so interrupt will be at every about 0.3 ms not 1 ms that mention it in comment. /* TIME.C: Time Functions for 1000Hz Clock Tick is comment is true? or did i go in fulse? also in systime_isr: if (systime_value % 16 == 0) process_keys(); is it true for 10 ms run the process_keys()?(comment 10 ms in control.c) i want to know how run process_keys() for every 10 ms? thanks.