AX58200 datasheet(40/180 Pages) ASIX

40 / 180 page

AX58200

EtherCAT Slave Controller SoC

AVDD

VBODL

BODOUT

BODRSTEN

Brown-out

Reset

(< BODDGSEL)

(= BODDGSEL)

Hysteresis

VBODH

Figure 2.2-5: Brown-out Detector (BOD) Waveform

2.2.2.5 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]).

2.2.2.6 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.

2.2.2.7 CPU Reset, CHIP Reset and MCU Reset

The CPU Reset means only Cortex® -M4 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 the 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 MCU 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 LDROM. User can set

the SYSRESETREQ(AIRCR[2]) to 1 to assert the MCU Reset.

AX58200 Datasheet(PDF) 40 Page - ASIX Electronics Corporation