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NUC220-LE1N Fiches technique(PDF) 48 Page - Nuvoton Technology Corporation

No de pièce NUC220-LE1N
Description  ARM짰 Cortex짰-M 32-bit Microcontroller
Download  107 Pages
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Fabricant  NUVOTON [Nuvoton Technology Corporation]
Site Internet  http://www.nuvoton.com
Logo NUVOTON - Nuvoton Technology Corporation

NUC220-LE1N Fiches technique(HTML) 48 Page - Nuvoton Technology Corporation

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NUC100/120xxxDN
Aug 31, 2015
Page 48 of 107
Rev 1.01
nRESET Reset
6.2.2.1
The nRESET reset means to generate a reset signal by pulling low nRESET pin, which is an
asynchronous reset input pin and can be used to reset system at any time. When the nRESET
voltage is lower than 0.2 VDD and the state keeps longer than 36 us (glitch filter), chip will be
reset. The nRESET reset will control the chip in reset state until the nRESET voltage rises above
0.7 VDD and the state keeps longer than 36 us (glitch filter). The RSTS_RESET (RSTSRC[1]) will
be set to 1 if the previous reset source is nRESET reset. Figure 6-3 shows the nRESET reset
waveform.
SS
nRESET
0.2 VDD
0.7 VDD
nRESET Reset
SS
36 us
36 us
Figure 6-3 nRESET Reset Waveform
Power-On Reset (POR)
6.2.2.2
The Power-on reset (POR) is used to generate a stable system reset signal and forces the
system to be reset when power-on to avoid unexpected behavior of MCU. When applying the
power to MCU, the POR module will detect the rising voltage and generate reset signal to system
until the voltage is ready for MCU operation. At POR reset, the RSTS_POR (RSTSRC[0]) will be
set to 1 to indicate there is a POR reset event. The RSTS_POR (RSTSRC[0]) bit can be cleared
by writing 1 to it. Figure 6-4 shows the waveform of Power-On reset.
VDD
VPOR
Power On
Reset
0.1V
Figure 6-4 Power-on Reset (POR) Waveform
Low Voltage Reset (LVR)
6.2.2.3
If the Low Voltage Reset function is enabled by setting the Low Voltage Reset Enable Bit
LVR_EN (BODCR[7]) to 1, after 100us delay, LVR detection circuit will be stable and the LVR
function will be active. Then LVR function will detect AVDD during system operation. When the


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