Issue with writing to MPC5748G ADC Module

mw98 — Fri, 19 Sep 2025 15:01:31 GMT

Hello,

I am running into an problem with the ADC module that I am not sure how to diagnose.

In my application, I am dropping the clock speeds down, along with turning off a lot of modules to get my current draw down to a low level. When I am trying to jump back into the regular speed, I cannot seem to write to the ADC module. I run into an IVOR1 exception. When I try to write to the ADC module with the debugger, I get a purple highlight of the register, indicating that the write did not occur.

I have looked through the AXI Bus registers and it does not look like any permissions are preventing me from writing to the module. I also do not have the SMPU enabled.

Are there any status registers that might help me diagnose this issue? Or, is there a simple way to "reset" the modules that I cannot write to?

Re: Issue with writing to MPC5748G ADC Module

petervlna — Mon, 22 Sep 2025 07:16:02 GMT

Hello,

I cannot seem to write to the ADC module. I run into an IVOR1 exception.

Verify that your ADC is correctly clocked before write to it.

38.3.17 Peripheral Status Register 0 (MC_ME_PS0)
This register provides the status of the peripherals.

Other than missing clocks, register protection or XBAR access right I do not see any issues.

But since you will end up in IVOR1 you can track it trough core registers: (see core reference manual)

Best regards,

Peter

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Issue with writing to MPC5748G ADC Module

Re: Issue with writing to MPC5748G ADC Module