topic Re: MKM35Z512VLL7's UART PORT OPEN DRAIN in Kinetis Microcontrollers

MKM35Z512VLL7's UART PORT OPEN DRAIN

jun1 — Tue, 15 Jun 2021 06:10:41 GMT

HI.

Use UART1 by connecting the RS485 driver IC to the outside. Is it necessary to disable open drain when using it with the UART function (I don't use it as an open drain)?
Pin Control Register n (PORTx_PCRn). 5 ODE --- Open Drain Enable

thank you.

Re: MKM35Z512VLL7's UART PORT OPEN DRAIN

jingpan — Wed, 23 Jun 2021 08:26:15 GMT

Hi,

I think it is base on what RS485 interface chip do you use. If you select MAX3485 for example, DI & RD is not open drain. So you can't set it to open drain mode.

Regards,

Jing