topic Re: S32K312 UART in S32K

S32K312 UART

lua40927 — Wed, 09 Jul 2025 01:11:32 GMT

Hello, I have a problem when using S32K312.
The CAN CLOCK I used originally was 60M, but I want to change it to 40M.

But after I changed it to 40M, the LPUART1 I used could send messages but could not receive messages (LPUART1 is normal at 60M).

The problem is that I see that the CLOCK of LPUART1 is AIPS_SLOW_CLK. Even if I change the CAN CLOCK from 60M to 40M, the value of AIPS_SLOW_CLK is not changed.
How can I solve this problem?

The following is the CLOCK setting of CAN CLOCK60M

The following is the CLOCK setting of CAN CLOCK40M

The following is the setting of LPUART1

The following is the UART send/receive function I use

Thanks

Re: S32K312 UART

PetrS — Wed, 09 Jul 2025 06:23:48 GMT

Hi,

keep the CORE/PLAT/SLOW clk ratios as stated in the chapter 24.7.2 System clocking configurations of the device RM. So for Option B config it is 1/2/4. If you need 40MHz on AIPS_PLAT_CLK, you should lower other clks as well to keep ratios as stated for this config.

BR, Petr

Re: S32K312 UART

lua40927 — Wed, 09 Jul 2025 07:19:50 GMT

Thank you very much for your reply

Re: S32K312 UART

chris_010 — Thu, 29 Jan 2026 10:37:43 GMT