Low Energy Timer - AN0026 - Application Note - Energy Micro
Low Energy Timer - AN0026 - Application Note - Energy Micro
Low Energy Timer - AN0026 - Application Note - Energy Micro
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...the world's most energy friendly microcontrollersFigure 4.1. RTC TriggerCOMP0IFRTC_COMP0RTC_CNT0LETIMER STARTUFIF UFIF UFIF UFIF UFIFLETIMER0_COMP0LETIMER0_CNT0REP0 = 5 REP0 = 4 REP0 = 3 REP0 = 2 REP0 = 1 REP0 = 0LETIM_OUT0The RTC generates a compare match after 5 seconds (RTC_COMP0 = 5) of program execution whichwill trigger the LETIMER to start counting. The LETIMER will count-down while LETIMERn_REP0!=0generating a pulse on each underflow. For this project LETIMER_REP0 has the value of 5 so there willbe 5 pulses generated on pin PD6 (P5.9 on the DK protoboard).<strong>Note</strong>The RTC continues counting after the compare match. If it wraps around the top valueand generates a new compare match the LETIMER will not be triggered becauseLETIMERn_REP0 = 0.2013-05-08 - an0026_Rev1.05 8 www.energymicro.com
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