Why SPC560P40 trigger swt reset?

[Simonwang]

I've been feeding dog, but sometimes it still triggered swt reset.

I can get reset info from reading DES and FES register.

WHY??

Who can tell me the FAE or technical department e-mail in China？

Or tell me the reasion?

[ODOUV.1]

Hello Simon ,

in RGM_DES, you should have bit13 at 1 (F_SWT) when the watchdog occurred.

in RGM_FES, which bit is enabled in your case ?

There are many possible reasons generating a SWT event.

• not serving a key value in SWT_SR (lock case)
• not serving the good key value in SWT_SR
• serving the key value too late after Interrupt
• serving the key value too late or too early in WINDOW mode
• your timeout SWT_TO is too short to be able to serve it
• bad SWT registers access
• etc...

Carefully read the chapter 27.3 in reference manual RM0046

https://www.st.com/content/ccc/resource/technical/document/reference_manual/da/ea/65/05/30/83/46/e1/CD00259527.pdf/files/CD00259527.pdf/jcr:content/translations/en.CD00259527.pdf

You can look into SPC5Studio tool the demo "SPC560Pxx_RLA SWT Test Application for Discovery" showing how to program an interrupt use case.

Demo "SPC560Dxx_RLA SWT Test Application for Discovery" provides an example for the regular use case, with and without WINDOW mode.

Best regards.