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Answer The HT48RA0-3 9-bit timer is a count down timer. When the timer registers, TSR0 and TSR1 bits t0-t8, count down to zero, the timer will stop counting and bit TOEF will be cleared to zero. Because the clock source for the timer is fSYS/64 the timer setup time = (timer initial value +1) x 64/fSYS.
