Overflow Mode

Zynq UltraScale+ Device Technical Reference Manual (UG1085)

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2.4 English

If the interval bit in the counter control register is not set, the counter can count up to or down from its full 32-bit value. An interrupt is generated when the count passes through zero. To increment, when the counter value register reaches 0xFFFF_FFFF it overflows to zero, then the overflow interrupt is set and counting up is restarted. To decrement, when the counter value register reaches zero, the overflow interrupt is set. The counter then overflows to 0xFFFF_FFFF and counting down is restarted.