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M54LN Fiches technique(PDF) 28 Page - Nuvoton Technology Corporation

No de pièce M54LN
Description  32-BIT MICROCONTROLLER
Download  71 Pages
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Fabricant  NUVOTON [Nuvoton Technology Corporation]
Site Internet  http://www.nuvoton.com
Logo NUVOTON - Nuvoton Technology Corporation

M54LN Fiches technique(HTML) 28 Page - Nuvoton Technology Corporation

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NuMicro
M052/M054BN Datasheet
Publication Release Date: Mar. 19, 2012
- 28 -
Revision V1.01
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”.


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