topic Re: MC56F8355 start up in Digital Signal Controllers

MC56F8355 start up

christophe_c — Thu, 14 Sep 2023 12:46:42 GMT

Hello,

I use an MC56F8355 and it doesn't start when I heat it.

The RESET signal is OK but the RSTO signal stayes at 0.

Thank you for your help

Regards

Christophe

xiangjun_rong — Fri, 15 Sep 2023 03:18:19 GMT

Hi,

I suppose that the MC56F8355 can run if you don't heat it.

This is the ambient temperature range the MC56F8355 can work.

Hope it can help you

XiangJun Rong

christophe_c — Fri, 15 Sep 2023 09:15:06 GMT

Hi,

If the temperature is 25°C, it's OK.

If the temperature is 10°C or 50°C, it's not OK.

I changed crystal by a ceramic resonator 8MHz and I can start the µcontroller at 10 and 50°C.

Is it necessary to change the bit register COHL which is at 1.

Regards

Christophe

xiangjun_rong — Mon, 18 Sep 2023 07:25:08 GMT

Hi,

If you use 8MHz ceramic resonator, I suppose the COHL bit should be cleared.

Pls refer to section 5.11.5 Oscillator Control Register w/o Relaxation Oscillator (OSCTL) in MC56F8300UM.pdf

Hope it can help you

XiangJun Rong