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Neon22 2014-02-04 21:42:28 -08:00
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Timebase-calculation-and-Clock-sources.md

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###Clock sources ###Clock sources
Timers get their clock source from External pins or Internal timer sources. Timers get their clock source from External pins or Internal timer sources.
####External
External = pins: TI1 or TI2 or ETR External = pins: TI1 or TI2 or ETR
1. set pin to be used: 1. set pin to be used:
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The first timer update_event, or output_compare signal is used as clock for the second. The first timer update_event, or output_compare signal is used as clock for the second.
Uses TRGI to map. Counter mode is set using the TIMx_CR1 reg and CMS bits as indicated in the example below. The counter mode sets whether the update_event occurs on overflow and/or underflow of the Timer. Uses TRGI to map. Counter mode is set using the TIMx_CR1 reg and CMS bits as indicated in the example below. The counter mode sets whether the update_event occurs on overflow and/or underflow of the Timer.
####Time Base generation ##Time Base generation
A Timer can be used as a Time base generator. A 16bit timer can generate update_events from nanoseconds up to a few minutes. A Timer can be used as a Time base generator. A 16bit timer can generate update_events from nanoseconds up to a few minutes.
The calculation is: The calculation is: