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In interval timing applications, a timer is programmed to overflow at a regular interval and the event is used to synchronize the program to perform an action such as checking the state of inputs, changing the output of an I/O pin, initiating an ADC conversion etc. This can also be used to generate waveforms at set frequencies. The diagram shows an interval timer set to count from 0x0000. In up counting mode as shown in the diagram, each clock edge will increment the counter until the final 16 bit value is reached (0xFFFF). At this point the counter rolls over to 0x0000 and starts counting again. This condition is called overflow. The timer can be used in this mode to generate a periodic event as shown in the example.
PTM Published on: 2011-05-13
South Korea