topic Re: How to reset MM9Z1-638 device in S12 / MagniV Microcontrollers

How to reset MM9Z1-638 device

gumu — Mon, 10 Jul 2023 06:27:09 GMT

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?

Re: How to reset MM9Z1-638 device

Q_man — Thu, 13 Jul 2023 07:33:07 GMT

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

Re: How to reset MM9Z1-638 device

gumu — Fri, 14 Jul 2023 00:46:11 GMT

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.

Re: How to reset MM9Z1-638 device

Q_man — Fri, 14 Jul 2023 07:12:10 GMT

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.

Re: How to reset MM9Z1-638 device

gumu — Thu, 20 Jul 2023 09:11:07 GMT

reset funcion is normal after removing 470nf capacitor .