MK02 UART in single-wire mode

bruceweyrauch — Mon, 31 Aug 2015 21:59:21 GMT

I want to use the MK02 UART in single-wire mode. I think understand that this means setting the UART TX PCR pin registeras a UART Tx pin, and setting the LOOPS and RSRC bits in the UART. Should the pullups be enabled on the Tx pin? Is this bit automatically configured as open drain?

Re: MK02 UART in single-wire mode

Paul_Tian — Tue, 01 Sep 2015 06:15:33 GMT

Hi, Bruce

Yes, you are correct. You need to set UART TX PCR to UART function. And enable single wire operation by setting C1[LOOPS] and the receiver source field,

C1[RSRC]. Setting C1[LOOPS] disables the path from the unsynchronized receiver input signal to the receiver. Setting C1[RSRC] connects the receiver input to the output of the TXD pin driver. Both the transmitter and receiver must be enabled (C2[TE] = 1 and C2[RE] = 1).

It is no need to set TX pin pull-up and open drain.

Best Regards

Paul

Kinetis Microcontrollers中的主题 MK02 UART in single-wire mode

MK02 UART in single-wire mode

Re: MK02 UART in single-wire mode