•The timer is then started by setting the run control bit
i.e.,
• SETB TR1
•Overflow flag is automatically set 100μs later. Following instruction will
check that
• WAIT:
JNB TF1, WAIT ; wait
until overflow flag is set.
•When the timer
overflows, it is necessary to stop the timer and clear
the overflow flag in software by the following instructions:
• CLR
TR1 ; stop Timer 1
CLR TF1 ;
clear overflow flag of Timer 1