Our CYCTM 20H series AMD9513-based counter/timer boards feature 20 counter/timers with inputs ranging from DC to 7MHx (max) and a programmable clock source. Choose from three fully programmable on-board sources of pulses to the 9513: External, 1MHz, or 5MHz Crystal. Your choice of PC interrupts IRQ2-IRQ7; interrupts can be used to initiate program execution on terminal count, set off an alarm, or reconfigure counters after a prescribed interval.
To supply a more precise source of timing pulses, the CYCTM 20HX board comes with a high-accuracy 50 parts-per-million crystal (XTAL) in place of the standard 100ppM XTAL. A variety of internal and external frequency sources may be selected as inputs for various counters.