I can not set timer 1 of dspic(33f256GP710) to one micro second. because in its related register(T1con) for setting timer there are 4 predetermined choice of timing (bit4,bit5:00-01-10-11) that each of them results in a duration of time for example "11" result about 1 second intervals and "00" result 2ms . I can not set the intervals of timer for example to 1.5 micro second. Is it not possible with timer1 or , is the problem with setting that I have done?