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Figure 9 Power-on Reset and Power-down Reset Oscillogram
POR
PDR
Reset
POR
PDR
Hysteresis
time
Hysteresis
voltage
V
DD
/V
DDA
t
Brownout reset (BOR)
When it is detected that V
DD
/V
DDA
is lower than the threshold voltage V
BOR
, the
chip will automatically remain in reset state, and V
BOR
can be configured through
option byte. The followings are 4 thresholds of V
BOR
:
V
BOR0
: BOR is turned off, and the voltage range is 1.80~2.10V
V
BOR1
: BOR level is 1, and the voltage range is 2.10~2.40V
V
BOR2
: BOR level is 2, and the voltage range is 2.40~2.70V
V
BOR3
: BOR level is 3, and the voltage range is 2.70~3.60V