MPC5xxx中的主题 Re: MPC5744P Keep Alive RAM Memory

MPC5744P Keep Alive RAM Memory

sagardhavali — Mon, 28 Jan 2019 19:37:54 GMT

Hello,

I am trying to retain a RAM value even after reset. But unfortunately the RAM locations are getting reset.

I tried to reserve 128 bytes and tried to store the value in 8 bytes and made that location as NO LOAD. I also altered startup script to initialize the SRAM to start initialize the location after the reserved memory. Nothing helped.

I have attached my Linker file along with Startup script.

Does anyone to how to work with this? Any help is much appreciated.

Thanks,

Sagar

Re: MPC5744P Keep Alive RAM Memory

petervlna — Tue, 29 Jan 2019 07:06:47 GMT

Hi,

RAM memory content is lost on following reset assertions:

1. Power on reset

2. Destructive reset

3. Long functional reset with BIST enabled

RAM content is preserved on reset:

1. Short functional reset

2. Long functional reset with BIST disabled

regards,

Peter

Re: MPC5744P Keep Alive RAM Memory

sagardhavali — Tue, 29 Jan 2019 15:31:53 GMT

Thanks for the reply, Peter.

I will check out those options.