MSP430F6779A: AUXxSW not operation

Hi waeagorn,

waragorn sornpanya said:

I not found example about bit AUX2SW, AUX1SW and AUX0SW in mspware (MSP430Ware_3_80_14_01). Why this bit (AUXxSW) not have example.

AUXxSW is a read register to represent the status of supply. I think this is the reason.

I assume after you clear the LOCKAUX, you should do some operations for supply changing. Does this not take the affect and it recovered to zero? You can take the chapter 4.2.2 for referencr to control the supply.

https://www.ti.com/lit/ug/slau208q/slau208q.pdf?ts=1709294634309&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FMSP430F6779A 

B.R.

Sal

This below is debug result.

AUX2SW, AUX1SW and AUX0SW set to zero after code "AUXCTL0 = AUXKEY".

AUX2SW, AUX1SW and AUX0SW will recover to normal operation after reset power. 

Hi waragorn,

waragorn sornpanya said:

But sometimes I found register AUXCTL0 bit AUX2SW, AUX1SW and AUX0SW set to zero (rare case).

It is little strange, how is the frequency of this situation happens?

waragorn sornpanya said:

AUX2SW, AUX1SW and AUX0SW set to zero after code "AUXCTL0 = AUXKEY".

According to your code, it seems that you are using hardware-control switching for this.However, hardware control need enable SVM in PMM:

Can you try software-control switching and check whether it can work:

B.R.

Sal

how is the frequency of this situation happens?

- Random (1-2 day per time)

step test.

1) Supply AUXVCC1 by battery supply

2) Supply DVCC by circuit AC to DC converter

    2.1) Supply 25 Vac (35 second)

    2.2) Supply 207 Vac (30-40 second)

3) Check register AUXCTL0 bit AUXxSW

4) re-step 2-3 until AUXxSW not operate

Hi waragorn,

Here might be a errata describes a relevant situation:

Maybe you can check with the workaround.

Actually I do not have the EVM board of F6779A, I will try to get one at office and then check whether I can reproduce this issue.

B.R.

Sal