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How to calculate timer value to use to generate a timer IRQ

I'm using an ARM7 core microcontroller. I'm unsure of how to calculate what T1LD register value to load to the timer to allow it to generate an IRQ every x ms. The only information that I can find in the documentation states "The timer interval is calcualted as follows" Interval = ((TxD)xPrescalar)/Source Clock I'm not sure...