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NUC140-LD1E Datasheet(Fiches technique) 27 Page - Nuvoton Technology Corporation

Numéro de pièce NUC140-LD1E
Description  ARM Cortex™-M0 32-BIT MICROCONTROLLER
Télécharger  89 Pages
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Fabricant  NUVOTON [Nuvoton Technology Corporation]
Site Internet  http://www.nuvoton.com
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NUC140-LD1E Datasheet(HTML) 27 Page - Nuvoton Technology Corporation

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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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