M451
May. 4, 2018
Page
177
of
1006
Rev.2.08
M4
51
S
E
RI
E
S
T
E
CH
NICA
L RE
F
E
R
E
NC
E
M
A
NU
A
L
AV
DD
V
LVR
Low Voltage Reset
T
1
( < LVRDGSEL)
T
2
( =LVRDGSEL)
T
3
( =LVRDGSEL)
LVREN
200 us
Delay for LVR stable
Figure 6.2-4 Low Voltage Reset (LVR) Waveform
Brown-out Detector Reset (BOD Reset)
6.2.2.4
If the Brown-out Detector (BOD) function is enabled by setting the Brown-out Detector Enable Bit
BODEN (SYS_BODCTL[0]), Brown-Out Detector function will detect AV
DD
during system
operation. When the AV
DD
voltage is lower than V
BOD
and the state keeps longer than De-glitch
time set by BODDGSEL (SYS_BODCTL[10:8]), chip will be reset. The BOD reset will control the
chip in reset state until the AV
DD
voltage rises above V
BOD
and the state keeps longer than De-
glitch time set by BODDGSEL (SYS_BODCTL[10:8]). The default value of BODEN, BODVL and
BODRSTEN is set by flash controller user configuration register CBODEN (CONFIG0 [23]),
CBOV (CONFIG0 [22:21]) and CBORST(CONFIG0[20]) respectively. User can determine the
initial BOD setting by setting the CONFIG0 register. Figure 6.2-5 shows the Brown-Out Detector
waveform.
