NUTINY-SDK-M0516 Nuvoton Technology Corporation of America, NUTINY-SDK-M0516 Datasheet - Page 66

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NUTINY-SDK-M0516

Manufacturer Part Number
NUTINY-SDK-M0516
Description
BOARD EVAL NUMICRO M051 SERIES
Manufacturer
Nuvoton Technology Corporation of America
Series
NuMicro M051™r
Type
MCUr
Datasheets

Specifications of NUTINY-SDK-M0516

Contents
Board, Cable
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
M051™ Series, M052/M054/M058/M0516
NuMicro M051
Series Technical Reference Manual
6.2.7
System Timer (SysTick)
The Cortex-M0 includes an integrated system timer, SysTick. SysTick 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 zero, and reload (wrap) to the value in the SysTick Reload Value
Register (SYST_RVR) on the next clock edge, then decrement on subsequent clocks. When the
counter transitions to zero, 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
zero 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 zero, the timer will be maintained with a current value of zero 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 documents “ARM® Cortex™-M0 Technical
Reference Manual” and “ARM® v6-M Architecture Reference Manual”.
Publication Release Date: Sep 14, 2010
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Revision V1.2

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