How to reset MM9Z1-638 device

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How to reset MM9Z1-638 device

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gumu
Contributor V

Hello,

I tried to use PCRReset() to reset MCU, it didn't work.

I'd like to know how to reset MM9Z1-638 device except watchdog?

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gumu
Contributor V

reset funcion is normal after removing 470nf capacitor .

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gumu
Contributor V

reset funcion is normal after removing 470nf capacitor .

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gumu
Contributor V

Hi @Q_man ,

There is a 470nf capacitor between RESET and GND. Does it impact action of PCR_CTL.HWR(M)?

RESET and RESET_A is connected together.

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Q_man
NXP Employee
NXP Employee

The 470nF is required to avoid the analog chip watchdog to periodically reset the uC. It should only be use for FLASH programming and should NOT be present in the application or software testing.

reset1.png

reset2.png

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Q_man
NXP Employee
NXP Employee

Hi,

using the PCR_CTL.HWR(M) should generate a Reset (RESET_A should be pulled low) if the D2D Interface is initialized.

What hardware do you use?

- are the RESET_A and RESET pins connected?

- is there anything else connected externally to the RESET?

- is the D2D interface setup correctly? E.g. can you read from the analog die (e.g. the PCR_SR)

Rgds

W.

 

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