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formatting

Neon22
2014-02-05 11:20:03 -08:00
parent c8bd351d9d
commit 6c40acd2db
1 changed files with 2 additions and 2 deletions
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Timebase-calculation-and-Clock-sources.md

@@ -34,7 +34,7 @@ Uses TRGI to map. Counter mode is set using the TIMx_CR1 reg and CMS bits as ind
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:
* update_event = TIM_CLK / (( PSC + 1) * (APR + 1) * (RCR + 1))
* ```update_event = TIM_CLK / (( PSC + 1) * (APR + 1) * (RCR + 1))```
where:
* TIM_CLK is the timer clock input
@@ -54,7 +54,7 @@ TIM_CLK is replaced by T1x_CLK - an ext freq applied to pins TI1 or 2
####External clock mode 2
TIM_CLK is replaced by ETR_CLK. ETR_PSC is also factored in as follows:
* update_event = ETR_CLK / ((ETR_PSC + 1) * ( PSC + 1) * (APR + 1) * (RCR + 1))
* ```update_event = ETR_CLK / ((ETR_PSC + 1) * ( PSC + 1) * (APR + 1) * (RCR + 1))```
* where ETR_CLK =100kHz, Prescaler=1, ETR_PSC=2, Autoreload=255, and Repetition=2
* update_event = 100 * 10e3 / ((2+1) (1+1) (255+1) (2+1)) = 21.7 Hz