6840 timer register usage 19871016/wjvg 0 IF 1.b0=0 THEN timer3 control like timer2 control w .......1 prescale timer3 /8 IF 1.b0=1 THEN timer1 control like timer2 control w .......1 internal reset 1 timer2 control/status w 1....... enable timer output w .1...... enable interrupt w ..1..... interrupt if gate input period is gt/-lt timeout w ..0.0... synthesize continuous w ..1.0... synthesize single shot w ...0.... write to latches also causes reset w ...01... measure frequency w ...11... measure puls width w .....1.. dual 8bit counting/-16bit w ......1. use e-clock/-external clock w .......1 timer1/-timer3 control r 1....... timer interrupt r .0000... not used r .....1.. timer 3 interrupt r ......1. timer 2 interrupt r .......1 timer 1 interrupt 2 rw timer1 buffer 4 rw timer2 buffer 6 rw timer3 buffer end