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This calculator is designed to give critical timing values for the
8051 microcontroller's timer 0 and timer 1. Enter the
microcontroller clock rate in megahertz and the desired run-time
duration in milliseconds of the timer. Click on Calculate. The
calculated rates and values are only the run-time of the timer; the
general formula is also given. No attempt at calculation of the
overhead is made for stopping, starting or loading and reloading of
the timers since that time is negligible. 12-clock parts are
conventional 8051 derivatives using 12 machine cycles to execute one
instruction cycle. Newer but similar devices often are 6-clock parts
and instruction cycle time is reduced by 50 percent. They only need
6 machine cycles to execute one instruction cycle.
