RM0351 RTC wakeup

[turboscrew]

Posted on September 10, 2017 at 16:20

In the STM32L4x5/4x6 reference manual (and some other manuals too, like RM0090) the figure 374 shows that the RTC wakeup timer can be clocked with ck_apre, but the description of RTC_CR says that the alternate input is ck_spre.

Can someone confirm that the register description is right and the picture is wrong?

[Imen.D]

Posted on September 11, 2017 at 17:02

Hello

Aaltonen.Juha

,

I confirm the typo in the RTC block diagram picture.

RTC_WUTR must receive 2 inputs :

• One from WUCKSEL prescaler output
• One from ck_spre (RTC_PRER synchronous prescaler output) and not from ck_apre which is a mistake in the block diagram.

This is a known error reported internallyand will be fixed in coming releases of the reference manual (as for other series of manuals too).

Thanks

Imen