MSPM0G1105: Regarding the oscillation of an external ceramic resonator

Hi Cash

Thank you for your quick reply.

I was relieved to hear your comment that there is no problem with the ceramic resonator I selected.

One more thing to confirm is that this ceramic resonator will not oscillate if you simply power on the

MSPM0G1105 without a program, is that correct?

I assume that it will not oscillate because it is not assigned to the HFXIN and HFXOUT pins, is that correct?

Best regards,

Hiroshi　Yamada

Hi Cash,

Today, I loaded an MCU program and checked it, and the ceramic resonator output was about 8 MHz.

The voltage was only just under 400 mV.

I checked the MCU standards but did not understand the required specifications.

Currently, when I re-boot by resetting after programming the MCU, an error occurs where the XDS110 probe cannot connect to the target,

and I think this is caused by the output level of the ceramic resonator.

I would appreciate some advice.

I'm in a hurry.

Best regards;

Hiroshi Yamada

Hi,

The voltage 400mV seems low. Do you have any load caps around the HFXT in the circuit. If so, try remove those caps, since the built in load capacitance is high enough. 

Best regards,

Cash Hao

Hi Cash,

Thank you for your quick comment.

Is it really low?

The current circuit diagram is as shown below, and there is no load.

R77 is non-mount.

How many volts do I need?

I can't connect the XDS110 probe, so I can't switch the internal oscillator.

Best regards;

Hiroshi Yamada

Hi,

To reconnect with MCU. You can try hold the NRST pin to low before power up the MCU. Hold it then power up the MCU. Then try to connect with XDS-110 and check if you can program the MCU or run a factory reset.

For the crystal, I think the voltage should close to VDD. 

Maybe you can try with R77 as 1Mohm and R78 as 330ohm, just like the one suggested in the crystal datasheet. 

Best regards,

Cash Hao

Hi Cash,

Thank you again for your prompt comment.

Unfortunately, changing the resistance value did not change the voltage level.

Initializing the factory settings still doesn't work.

I read an article on the Internet that said that increasing the load capacitance increases the excitation level,

so I'm trying to try that, but the modification is difficult and I haven't been able to check it yet.

Best regards;

Hiroshi Yamada

Hi,

Okay. Any progress on adding the load capacitance?

However, if you still can not connect to the MCU somehow, it could also cause issues. Do you know how to run a factory reset on the MCU right?

Best regards,

Cash Hao

Hi Cash,

Thank you for your comment.

Changing the capacity is difficult, so I am still considering it.

The aim of this attempt at changing the capacity is to change it to the initial setting (using the MCU's built-in clock),

so I just want to connect the XDS110 probe, even if it is unstable.

As you say, I just want to be able to reset it to the factory settings.

I haven't yet figured out how to reset it to the factory settings, so please tell me.

That's what I would like to know.

Best regards;

Hiroshi Yamada

Hi Cash,

I have a question.

>To reconnect with MCU. You can try hold the NRST pin to low before power up the MCU. Hold it then power up the MCU. Then try to connect with XDS-110 and check if you can program the MCU or run a factory reset.

Does this mean that the NRST pin of only the MCU is held low?

Currently, NRST is also connected to the connector for connecting the XDS110 probe.

Does this mean that if it is only the MCU's NRSRT, work is required to separate it?

You said to turn on the MCU's power while holding the MCU's NRST low, but can I release the low NRST after turning on the power?

NRST is also connected to the XDS110 probe, but if I turn on the MCU's power while holding it low, and then release NRST and try to connect the XDS110 probe, I cannot connect. (Target not connect)

Please let me know about your previous inquiry as well.

Best regards;

Hiroshi Yamada

Hi,

You can disconnect the NRST pin to the XDS110 before powering up the MCU. After power up the MCU, you can release the NRST pin to HIGH. 

For factory reset process, please refer to this guide. 

3542.Factory_reset_v3.pdf

Best regards,

Cash Hao

Hi Cash,

Thank you for your reply.

I will check the guide for the factory reset process.

I'm sorry for asking multiple times.

>You can disconnect the NRST pin to the XDS110 before powering up the MCU. After power up the MCU, you can release the NRST pin to HIGH. 

What does this mean?

Is it the following part of Sysconfig?

Or is it a setting on the XDS110 probe side?

Please help.

Hiroshi Yamada

Hi,

No, it is not a configuration in sysconfig. 

You can disconnect the NRST pin to the XDS110 before powering up the MCU manually on the hardware side. 

After power up the MCU, you can release the NRST pin to HIGH by reconnecting the NRST pin to the XDS110 RST pin. 

Best regards,

Cash Hao

Hi Cash,

Thank you for your quick reply.

I'm really sorry for asking so many times.

Is it perhaps something written in 3.7.3.1 of the XD110 probe user's guide?

Is that right?

Or do you mean not to connect the XDS110 probe before powering on the MCU, but to connect the XDS110 probe after powering on?

Best regards;

Hiroshi Yamada

Hi Cash,

Thank you for your explanation so many times.

In terms of hardware connection, does that mean that NRST must be separated between the XDS110 and the target MCU?

To be precise, what I'm using now is the TMDSEMU110-U.

If I try to implement the method you explained, I will need to modify the target board, right?

I have also purchased the LP-MSPM0G3507, so I don't think any modifications will be necessary,

but I need to consider how to connect it to my current target board and the 10-pin connector with SWD.

Is this the right idea?

Best regards;

Hiroshi Yamada

Hi,

hiroshi.yamada said:

In terms of hardware connection, does that mean that NRST must be separated between the XDS110 and the target MCU?

I am not understanding this statement. All the connections between the XDS110 and target MCU are separated. You need to connect the SWD interface through a cable or a jumping wire between the XDS110 and MCU. So, they are all separated.

I do not think you need to modify the board.  Okay, you do not reserve the NRST pin below. So it is hard for you to connect NRST pin to XDS110. That is fine, it is not necessary require to connect it back to XDS110. When you run the factory process, you can manually press the RST button instead of connecting the NRST pin to XDS110.  

Best regards,

Cash hao

Hi Cash,

Thank you for your comment.

I may be misinterpreting this, but I previously attached a circuit diagram which has a switch (tactile switch) that manually sets NRST to low.

BThis switch is connected to NRST of CN5, which connects to the MCU and the 10-pin adapter of the XDS110 probe.

Best regards;

Hiroshi Yamada

Hi Cash,

Thank you for letting me know.

Thank you so much for your help so many times.

Since the XDS-110 does not require RST, I need to cut the RST pattern connected to the 10-pin connector of the XDS-110 on the target board, right?

I cannot check today, so I will check soon and get back to you.

Best regards;

Hiroshi Yamada

Yes. Okay.

Hi Cash,

It's been a while.

I have other problems so I haven't tried it yet.

This PCB needs to be restored so I will do so as soon as the other problems are resolved.

I will be sure to let you know the results.

Best regards,

Hiroshi Yamada