M263 datasheet(273/398 Pages) NUVOTON

273 / 398 page

M261/M262/M263

Mar 25, 2020

Page 273 of 398

Rev 1.02

AVDD

VBODL

BODOUT

BODRSTEN

Brown-out

Reset

(< BODDGSEL)

(= BODDGSEL)

Hysteresis

VBODH

Figure 6.2-5 Brown-out Detector (BOD) Waveform

6.2.2.5

Watchdog Timer Reset (WDT)

In most industrial applications, system reliability is very important. To automatically recover the MCU

from failure status is one way to improve system reliability. The watchdog timer(WDT) is widely used

to check if the system works fine. If the MCU is crashed or out of control, it may cause the watchdog

time-out. User may decide to enable system reset during watchdog time-out to recover the system and

take action for the system crash/out-of-control after reset.

Software can check if the reset is caused by watchdog time-out to indicate the previous reset is a

watchdog reset and handle the failure of MCU after watchdog time-out reset by checking

WDTRF(SYS_RSTSTS[2]).

6.2.2.6

CPU Lockup Reset

CPU enters lockup status after CPU produces hardfault at hardfault handler and chip gives immediate

indication of seriously errant kernel software. This is the result of the CPU being locked because of an

unrecoverable exception

following the activation of the processor’s built in system state protection

hardware. When chip enters debug mode, the CPU lockup reset will be ignored.

6.2.2.7

CPU Reset, CHIP Reset and System Reset

The CPU Reset means only Cortex

® -M23 core is reset and all other peripherals remain the same

status after CPU reset. User can set the CPURST(SYS_IPRST0[1]) to 1 to assert the CPU Reset

signal.

The CHIP Reset is same with Power-on Reset. The CPU and all peripherals are reset and

BS(FMC_ISPCTL[1]) bit is automatically reloaded from CONFIG0 setting. User can set the

CHIPRST(SYS_IPRST0[1]) to 1 to assert the CHIP Reset signal.

The System Reset is similar with CHIP Reset. The difference is that BS(FMC_ISPCTL[1]) will not be

reloaded from CONFIG0 setting and keep its original software setting for booting from APROM or

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