M263 datasheet(272/398 Pages) NUVOTON

272 / 398 page

M261/M262/M263

Mar 25, 2020

Page 272 of 398

Rev 1.02

6.2.2.3

Low Voltage Reset (LVR)

If the Low Voltage Reset function is enabled by setting the Low Voltage Reset Enable Bit LVREN

(SYS_BODCTL[7]) to 1, after 200us 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 AVDD voltage is

lower

than

VLVR and the state keeps longer than De-glitch time set by LVRDGSEL

(SYS_BODCTL[14:12]), chip will be reset. The LVR reset will control the chip in reset state until the

AVDD voltage rises above VLVR and the state keeps longer than De-glitch time set by LVRDGSEL

(SYS_BODCTL[14:12]). The default setting of Low Voltage Reset is enabled without De-glitch

function. Figure 6.2-4 shows the Low Voltage Reset waveform.

AVDD

VLVR

Low Voltage Reset

( < LVRDGSEL)

( =LVRDGSEL)

LVREN

200 us

Delay for LVR stable

Figure 6.2-4 Low Voltage Reset (LVR) Waveform

6.2.2.4

Brown-out Detector Reset (BOD Reset)

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 AVDD during system operation.

When the AVDD voltage is lower than VBOD which is decided by BODEN and BODVL

(SYS_BODCTL[18:16]) 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

AVDD voltage rises above VBOD and the state keeps longer than De-glitch time set by BODDGSEL. The

default value of BODEN, BODVL and BODRSTEN (SYS_BODCTL[3]) is set by Flash controller user

configuration

CBODEN

(CONFIG0

[19]),

CBOV

(CONFIG0

[23:21])

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.

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