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By using a TMR0 register and it prescaler, the maximum time that can be reached is 255*255 = 65ms. In order to get more time, the interrupt events should be counted for X times; and the reached time can be calculated by multiplying the value of TMR0, the Prescaler , and the X value. The timer zero calculator search for all possible. Freeware download of Timer zero calculator 1.0, size 1.87 Mb.