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An add-on circuit to the timer is the capture/compare module. This provides the capability to store the timer value when an external event occurs during capture mode. In the compare mode, an output flag from the timer module identifies when a match occurs between a value stored in an SFR and the timer count value using a comparator. There are many different uses for these types of events, however, in the CP240x devices this method can be used to calibrate the smaRTClock oscillator with the system clock. In the examples provided, the capture event stores the value of the timer in the capture register and the compare event occurs when the timer value matches the value stored in the comparator.
PTM Published on: 2011-05-13
India