topic Re: Wake-up by CAN S12ZVMC256? in S12 / MagniV Microcontrollers

Wake-up by CAN S12ZVMC256?

Georgio_69 — Fri, 30 Jul 2021 13:59:37 GMT

Hello, I would like to know if it's possible to have a wake-up by CAN on S12ZVMC256 MCU? Thanks in advance for your feed-back Best regards,

Re: Wake-up by CAN S12ZVMC256?

StanoA — Mon, 02 Aug 2021 07:52:29 GMT

Hello Georgio,

The MSCAN can work in sleep mode only. In STOP mode the module is set to power down mode and will not work.

The one option how to wake-up MCU by CAN activity could be connect the RXCAN signal externally to GPIO pin with wake-up functionality. Then after wake-up the MCU the CAN must be activated and the next message can be successfully received. As you know the CAN transmitter sends message and waits for back response from the receiver site. The send message repeats till right answer received. So the first attempt will wake the MCU up and second message (or next) can be successfully received and answered.

I hope it helps you to solve your task.

Best Regards,

Stano.

Re: Wake-up by CAN S12ZVMC256?

Georgio_69 — Fri, 17 Sep 2021 10:15:00 GMT

Hello, Thanks for your explanation. The status is not so clear for me because in document “MC9S12ZVM-FamilyReference Manual and Datasheet » Chap21.1.1, it is mentioned that “Low power mode with remote CAN wake-up”? As an alternative solution, is it possible to connect external CAN transceiver managing wake-up by CAN? What is the low power mode current consumption (max value)? Thanks again for your support Best regards, Georges FRAPPA