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Merge pull request #3430 from gebart/pr/mulle-crystal-load-cap

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boards/mulle: Reduce RTC crystal load capacitance
This commit is contained in:
Joakim Gebart 2015-07-17 09:47:38 +02:00
commit cf705a7fa6
1 changed files with 6 additions and 2 deletions
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8
boards/mulle/include/periph_conf.h
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@ -793,8 +793,12 @@ extern "C"
/**
* RTC module crystal load capacitance configuration bits.
*/
/* enable 12pF load capacitance, might need adjusting.. */
#define RTT_LOAD_CAP_BITS (RTC_CR_SC8P_MASK | RTC_CR_SC4P_MASK)
/* The crystal on the Mulle is designed for 12.5 pF load capacitance. According
* to the data sheet, the K60 will have a 5 pF parasitic capacitance on the
* XTAL32/EXTAL32 connection. The board traces might give some minor parasitic
* capacitance as well. */
/* enable 6pF load capacitance, might need adjusting.. */
#define RTT_LOAD_CAP_BITS (RTC_CR_SC4P_MASK | RTC_CR_SC2P_MASK | RTC_CR_SC1P_MASK)
/** @} */