Hercules RM48L952ZWT triggering hard reset in software

Tammy Noergaard

Hello,

We are using the RM48L952ZWT on the Hercules board. I know we do a soft reset via the

systemREG1->SYSECR |= 0x00008000;

however this leaves a few hardware items in an unstable state, so we wanted to know how to trigger a full hard reset via software so it reboots as a hard power cycle would? Thank you.

over 8 years ago

0 Charles Tsai over 8 years ago

TI__Guru**** 191066 points

Hi Tammy,
A reset via systemREG1->SYSECR is a warm system reset. Some modules in the device particularly the debug logic, some analog components and some status registers (i.e. ECC error address) do NOT get reset by the warm reset. In order to a cold reset your only choice is the nPORRST.

0 Tammy Noergaard over 8 years ago in reply to Charles Tsai

Genius 3665 points

Hi Charles thank you. Do you have an example of how to manipulate the nPORRST in software to trigger the hard reset? Thank you again.

0 Anthony F. Seely over 8 years ago in reply to Tammy Noergaard

TI__Guru 68920 points

Is this a warm reset or just CPU reset Charles. I think I read in the TRM it was only resetting the CPU not the peripherals.

Wouldn't a watchdog reset be the only way to reset CPU+Peripherals.?

0 Charles Tsai over 8 years ago in reply to Tammy Noergaard

TI__Guru**** 191066 points

Tammy,
No, you can only assert nPORRST via the pin. You can't do cold reset via software. You can generate an event to your external voltage supervisor or ASIC to pull nPORRST.

0 Charles Tsai over 8 years ago in reply to Charles Tsai

TI__Guru**** 191066 points

Anthony,
SYSECR is a system software reset. To do only CPU reset it is the CPURSTCR register.

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Hercules RM48L952ZWT triggering hard reset in software