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NUC220-LE1N Fiches technique(PDF) 58 Page - Nuvoton Technology Corporation |
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NUC220-LE1N Fiches technique(HTML) 58 Page - Nuvoton Technology Corporation |
58 / 107 page NUC100/120xxxDN Aug 31, 2015 Page 58 of 107 Rev 1.01 6.2.6 System Timer (SysTick) The Cortex ® -M0 includes an integrated system timer, SysTick, which provides a simple, 24-bit clear-on-write, decrementing, wrap-on-zero counter with a flexible control mechanism. The counter can be used as a Real Time Operating System (RTOS) tick timer or as a simple counter. When system timer is enabled, it will count down from the value in the SysTick Current Value Register (SYST_CVR) to 0, and reload (wrap) to the value in the SysTick Reload Value Register (SYST_RVR) on the next clock cycle, then decrement on subsequent clocks. When the counter transitions to 0, the COUNTFLAG status bit is set. The COUNTFLAG bit clears on reads. The SYST_CVR value is UNKNOWN on reset. Software should write to the register to clear it to 0 before enabling the feature. This ensures the timer will count from the SYST_RVR value rather than an arbitrary value when it is enabled. If the SYST_RVR is 0, the timer will be maintained with a current value of 0 after it is reloaded with this value. This mechanism can be used to disable the feature independently from the timer enable bit. For more detailed information, please refer to the “ARM ® Cortex® -M0 Technical Reference Manual” and “ARM ® v6-M Architecture Reference Manual”. |
Numéro de pièce similaire - NUC220-LE1N |
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Description similaire - NUC220-LE1N |
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