Microcontroller
Peripheral Timing
Calculator

Philips XA - Timer 0 and Timer 1

The calculated rates and values are pure run-time of the timer. No overhead is added for stopping, starting or (re-)loading the timers.

Clock frequency (in MHz):	(mhz)
Desired run-time of timer (in milliseconds):	(drt)

A prescaler can be set to divide the input frequency by 4, 16 or 64.

	Prescaler Osc/4	Prescaler Osc/16	Prescaler Osc/64
Duration of a single timer tic (microseconds)	tic=1/(mhz/4)	tic=1/(mhz/16)	tic=1/(mhz/64)
Maximum run-time of timer 8-bit counter (milliseconds)	max=tic255/1000*	max=tic255/1000*	max=tic255/1000*
Maximum run-time of timer 16-bit counter (milliseconds)	max=tic65535/1000*	max=tic65535/1000*	max=tic65535/1000*
8-Bit reload value for desired runtime (milliseconds)	rel=255-(drt/tic1000)*	rel=255-(drt/tic1000)*	rel=255-(drt/tic1000)*
16-Bit reload value for desired runtime (milliseconds)	rel=65535-(drt/tic1000)*	rel=65535-(drt/tic1000)*	rel=65535-(drt/tic1000)*

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