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NUC120-YB3C Fiches technique(PDF) 27 Page - Nuvoton Technology Corporation |
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NUC120-YB3C Fiches technique(HTML) 27 Page - Nuvoton Technology Corporation |
27 / 89 page NuMicro ™ NUC120 Data Sheet Publication Release Date: Jan. 2, 2012 - 27 - Revision V2.03 5.2. ysTick. SysTick provides a simple, 24-bit anism. The perat r as a simple counter. l un SysTick Current Value Register (SYST_CVR) to zero, and reload (wrap) to the value in the SysTick Reload Value e ck cy quent clocks. When the counter transitions to zero, the COUNTFL ears on The SYST_CVR value is UNKNOWN on re lear it to zero before enabling the feature. This ens R value ena If the SYST_RVR is zero, the timer will be maint s c ature independently from i ef RM ® Cortex™-M0 Technical 5 System Timer (SysTick) The Cortex-M0 includes an integrated system timer, S clear-on-write, decrementing, wrap-on-zero counter with a flexible control mech counter can be used as a Real Time O ing System (RTOS) tick timer o When system timer is enab ed, it will co t down from the value in the Register (SYST_RVR) on th next clo cle, then decrement on subse AG status bit is set. The COUNTFLAG bit cl reads. set. Software should write to the register to c ures the timer will count from the SYST_RV rather than an arbitrary value when it is bled. ained with a current value of zero after it is an be used to disable the fe reloaded with this value. Thi the timer enable bit. mechanism For more detailed informat Reference Manual” and “ARM on, please r ® v6-M Archite er to the documents “A cture Reference Manual”. |
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