AX58200 datasheet(67/180 Pages) ASIX

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AX58200

EtherCAT Slave Controller SoC

Watchdog Timer (WDT)

2.9.1

Overview

The Watchdog Timer (WDT) is used to perform a system reset when system runs into an unknown state. This

prevents system from hanging for an infinite period of time. Besides, this Watchdog Timer supports the function

to wake up system from Idle/Power-down mode.

2.9.2

Features

⚫

18-bit free running up counter for WDT time-out interval

⚫

Selectable time-out interval (24 ~ 218) and the time-out interval is 1.6 ms ~ 26.214 s if WDT_CLK

= 10 KHz.

⚫

System kept in reset state for a period of (1 / WDT_CLK) * 63

⚫

Supports selectable WDT reset delay period, including 1026、130、18 or 3 WDT_CLK reset

delay period

⚫

Supports to force WDT enabled after chip powered on or reset by setting CWDTEN[2:0] in

Config0 register

⚫

Supports WDT time-out wake-up function only if WDT clock source is selected as 10 KHz or

LXT.

Window Watchdog Timer (WWDT)

2.10.1 Overview

The Window Watchdog Timer (WWDT) is used to perform a system reset within a specified window period to

prevent software running to uncontrollable status by any unpredictable condition.

2.10.2 Features

⚫

6-bit down counter value (CNTDAT, WWDT_CNT[5:0]) and 6-bit compare value (CMPDAT,

WWDT_CTL[21:16]) to make the WWDT time-out window period flexible

⚫

Supports 4-bit value (PSCSEL, WWDT_CTL[11:8]) to programmable maximum 11-bit prescale

counter period of WWDT counter

⚫

WWDT counter suspends in Idle/Power-down mode

Real Time Clock (RTC)

2.11.1 Overview

The Real Time Clock (RTC) controller provides the real time and calendar message. The RTC offers

programmable time tick and alarm match interrupts. The data format of time and calendar messages are

expressed in BCD format. A digital frequency compensation feature is available to compensate external crystal

oscillator frequency accuracy.

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