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In this mode, the timer becomes a 16-bit external event counter, clocked from an input signal applied to the G3 input. The maximum frequency for this G3 input clock is 250 kHz (half of the 0.5 MHz instruction cycle clock). When the exter- nal event counter underflows, the value in the autoreload register is copied into the timer. This timer underflow may also be used to generate an interrupt. Bit 5 0f the CNTRL register is used to select whether the external event counter clocks on positive or negative edges from the G3 input. Con- sequently, half cycles of an external input signal could be counted. The External Event counter mode is shown in Fig- ure 8.