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The application of timer/counter in microcontroller system had provided advantages in a way that it didnt put the burden on CPU resources and enabled CPU to perform other tasks. With the availability of 8-bit and 16-bit timer/counter, the problem laid on the selection of the type of timer/counter being used. From the experiments performed, the minimum system of AVR ATmega8535 microcontroller had precisely counted a number using two different timers/counters, namely, Timer/Counter 0 (8 bit) and Timer/Counter 1 (16 bit). The overflow condition achieved on 8-bit and 16-bit counting cycle activated OCR0 and OCR1AL registers, respectively. Output signals from port B.3 (OC0) and port D.5 (OC1A) ¬†are then fed to oscilloscope and put into comparison. From the observation of output signals, it could be proven that the two different timers/counters had equal counting speed. Hence, it can be concluded that the selection of timers/counters is more likely based on the flexibility of count range, program size and execution time
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