inglés al español Técnico/Ingeniería Electrónica / Ing. elect. Clocking devices

"Timer 1 is configured as divide by 1,500 square-wave rate generator. The clock for Timer 1 is 1Mhz. The two millisecond RTIMCLK [real time clock] signal is used **to gate** Timer 1 and to clock "D" Flip-Flop; and the output of Timer 1 is used to clock "D" Flip-Flop. Whenever the **gate** of Timer 1 goes low, counting is disabled and its output (MBESP*) is immediately forced high. "

I've seen gate (noun), in this context, translated as 'puerta', portal' or even 'gate'; but, I'm not sure what 'to gate', or 'to clock' for that matter, means here.

Translation is for Spain, thanks.