topic AN5201(Integrating the LIN driver) question in S12 / MagniV Microcontrollers

AN5201(Integrating the LIN driver) question

bjhwang — Tue, 19 Sep 2017 07:39:52 GMT

Dear Sir or Madam,

I'm using S12ZVMx128 EVB for testing LIN communication.

I use OSBDM port to debug the board and using AN5201SW for example.

The problem is the sw runs very well while OSBDM cable is inserted, but after reset(power switch off/on and the cable is removed), the motor is not running. It doesn't perform reset.

Could you give me some advice for this?

Thank you.

Re: AN5201(Integrating the LIN driver) question

danielmartynek — Wed, 20 Sep 2017 12:21:50 GMT

Hello,

With OSBDM, the MCU enters Special Single Chip Mode. See Chapter 1.9.1 of the reference manual.

Without the debugger, the MCU enters Normal Single Chip Mode.

Certain registers can be written only once in Normal Mode, for instance MODRR0/1,2, FOPT, CPMUCOP, …

Whereas in Special Mode, they can be written anytime.

So make sure all the registers are written only once.

Regards,

Daniel

Re: AN5201(Integrating the LIN driver) question

bjhwang — Mon, 25 Sep 2017 02:19:56 GMT

Thanks for the feedback.

I have one more question to this AN5201SW.

You said that all the registers are written only once, but I'm confuse about this.

The testing condition is same as I mentioned before(S12ZVMxEVB), and If I perform reset(SW4) while the OSBDM is implemented the motor is not running.(the motor automatically runs at 1500RPM).

So the point is, if I change this registers to normal single chip mode, the board can performs reset and runs at 1500RPM again?

Thanks

Best Regards