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Mini57
Apr. 06, 2017
Page 45 of 475
Rev.1.00
MINI5
7
S
E
RI
E
S
TECH
NIC
A
L R
E
F
E
RE
N
CE
MA
N
UA
L
0.7 V
DD
and the state keeps longer than 36 us (glitch filter). The PINRF (SYS_RSTSTS[1]) will be
set to 1 if the previous reset source is nRESET reset. Figure 6.2-2 shows the nRESET reset
waveform.
nRESET
0.2 V
DD
0.7 V
DD
nRESET Reset
16.8 us
16.8 us
Figure 6.2-2 nRESET Reset Waveform
6.2.2.2
Power-On Reset (POR)
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 PORF (SYS_RSTSTS[0]) will be
set to 1 to indicate there is a POR reset event. The PORF (SYS_RSTSTS[0]) bit can be cleared
by writing 1 to it. Figure 6.2-3 shows the waveform of Power-On reset.
V
DD
V
POR
Power On
Reset
0.1V
Figure 6.2-3 Power-on Reset (POR) Waveform
6.2.2.3
Low Voltage Reset (LVR)
Low Voltage Reset detects AV
DD
during system operation. When the AV
DD
voltage is lower than
V
LVR
and the state keeps longer than De-glitch time (16*HCLK cycles), chip will be reset. The LVR
reset will control the chip in reset state until the AV
DD
voltage rises above V
LVR
and the state
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