topic Re: Can MPC5744P feed SBC watch dog when it's in Halt0 mode? in MPC5xxx

Can MPC5744P feed SBC watch dog when it's in Halt0 mode?

leo_liu2 — Sat, 02 Jan 2021 13:13:07 GMT

Hi Sir, I want to know whether MPC5744P can still feed the SBC watch dog when it is in Halt0 mode?To save power,so i have to let the MCU enter Halt0 mode,however,it's suppose to feed the SBC watch dog becase it supply the power of MCU and other module.But when MCU enter Halt0 mode ,it's seems does't work anymore and can' feed watch dog,so whether i should wake up the MCU to feed to SBC watch dog and let it enter Halt0 mode again after feeding the SBC watch dog.Can you tell me whether my idea can work or not? If it can ,how to realize it,is there any example i can refer to? If it can't,how can i realize my intention?

Best regard,

Leo

Re: Can MPC5744P feed SBC watch dog when it's in Halt0 mode?

petervlna — Wed, 06 Jan 2021 13:54:52 GMT

Hello,

Sure it can feed the SBC. But have in mind that the core is not operational in this mode. So no instructions are executed by core.

so whether i should wake up the MCU to feed to SBC watch dog and let it enter Halt0 mode again after feeding the SBC watch dog.Can you tell me whether my idea can work or not?

yes this is correct approach

Furhtermore: XBAR masters cannot operate in system HALT0 mode as they are clock gated.

best regards,

Peter

Re: Can MPC5744P feed SBC watch dog when it's in Halt0 mode?

leo_liu2 — Thu, 07 Jan 2021 02:24:13 GMT

Hi,

Thanks to tell me that my idea is work.Are there any example that can show me how to realize the function?I have tried to realize that,but it's failed.When i transfer the mcu to Halt0 mode ,it turn back to RUN0 quickly.

best regards,

leo