After some research ive decided to use a 16bit timer0 and the Function GATE0 to time the events. I Decided want to incorporate a counter using C/T1 to count the amount of times the laser has being broken.. Heres the code so far.. Ive set up the timer so that every time it overflows its 1/20th of a second. Have i set TMOD Correctly? wat address is the time stored in stored in?

SET TMOD (0101 1101)

MOV THO, #76;
MOV TL0, #01;
MOV TMOD, #01
SETB TR0;
JNB TF0, $;

MOV B, 0.05; \ Make b 1/20
MOV A, 8CH; \ Move the overflow value into accumulator
MUL AB \ Multiply A by B, to find the amount of time it took