Figure 6.2-3 Brown-Out Detector (Bod) Waveform - Nuvoton ISD94124BYI Technical Reference Manual

Isd arm cortex-m4f soc

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6.2.2.2 Power-on Reset (POR)

System power-on generates the Power-on reset (POR). When power is applied, the POR module

detects the rising voltage and generates reset signal. The reset signal stays active until the voltage

is ready for MCU operation. PORF bit (SYS_RSTSTS[0]) will be set to 1 to indicate a POR reset

event. The PORF bit (SYS_RSTSTS[0]) can be cleared by writing 1 to it.

6.2.2.3 Low Voltage Reset (LVR)

Writing 1 to LVREN bit (SYS_BODCTL[7]) enables the Low Voltage Reset (LVR) function. If enabled,

the LVR function module keeps monitoring V

voltage has been lower than V

Once triggered, the LVR reset keeps the chip in reset state until the V

been above V

By default, Low Voltage Reset is enabled without De-glitch function.

6.2.2.4 Brown-out Detector Reset (BOD Reset)

Writing 1 to Brown-out Detector Enable Bit BODEN (SYS_BODCTL[0]) enables the Brown-out

Detector (BOD) function. In addition, writing 1 to the BODRSTEN (SYS_BODCTL[3]) enables the

BOD reset function. When enabled, the BOD module monitors V

voltage is lower than V

time (defined by BODDGSEL bits in SYS_BODCTL[10:8]), a BOD reset will be triggered. The BOD

reset keeps the chip in reset state until a condition is met that V

for more than De-glitch time (defined by BODDGSEL).

Initial values of BODEN, BODVL and BODRSTEN (SYS_BODCTL[3]) are defined in flash

configuration byte CONFIG0. Figure 6.2-3 shows the Brown-out Detector waveform.

Figure 6.2-3 Brown-out Detector (BOD) Waveform

ISD94100 Series Technical Reference Manual

during system operation.

, a LVR reset will be triggered and the chip will be reset.

(defined by BODVL bits in SYS_BODCTL[18:16]) for more than De-glitch

(< BODDGSEL)

(= BODDGSEL)

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voltage rises back and has

during system operation, if V

voltage has been higher than

(= BODDGSEL)

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