
PERIPHERAL INTERFACING – II 359
10.1.6 | Mode 1: Programmble One Shot
is mode is also called the hardware re-triggerable one-shot. After the count-registers are
loaded, the GATE must be given an L to H transition, which constitutes the trigger for
the one-shot. Once the trigger is obtained, the OUT pin goes low and remains low until
N × T where N is the count loaded in the count-register and T is the period of the input
clock. Meanwhile, if the GATE is given another L to H transition, the count is re-loaded
and counting starts again. is re-triggering capability is what gives it the name of a
‘re- triggerable one shot’. Refer Fig 10.8a ...