AX58200 datasheet(39/180 Pages) ASIX

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AX58200

EtherCAT Slave Controller SoC

2.2.2.3 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 2.2-4 shows the Low Voltage Reset waveform.

AVDD

VLVR

Low Voltage Reset

( < LVRDGSEL)

( =LVRDGSEL)

LVREN

200 us

Delay for LVR stable

Figure 2.2-4: Low Voltage Reset (LVR) Waveform

2.2.2.4 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 register CBODEN (CONFIG0 [19]), CBOV (CONFIG0 [23:21]) and

CBORST(CONFIG0[20]) respectively. User can determine the initial BOD setting by setting the CONFIG0

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