S12 / MagniV Microcontrollersのトピック2 stop bit configiration in s12x SCI

2 stop bit configiration in s12x SCI

kimsunmin — Tue, 12 Dec 2017 00:39:29 GMT

I need to implement UART drive. The configuration of the frame is that it has 1 start bit, 8 data bit, 1 parity bit, 2 stop bit.

But the problem is that s12x has no configuration register for the number of stop bit. Only 1 stop bit is supported.

In this case, How can i do?? Any solution?

Re: 2 stop bit configiration in s12x SCI

lama — Tue, 12 Dec 2017 19:18:18 GMT

Hi,

the answer is easy. You want to send 1+8+2. it is the same like 1+9+1.

So, you should set nine data bit communication and use 8 data bit as the first stop bit.

The register SCIDRH contains bits R8 and T8 which are used as a 8 data bit in the 1+9+1 communication format.

In order to set 1+9+1 communication set the M bit in the register SCICR1 and Set the R8 to required stop bit polarity.

That's all you need to do.

Best regards,

Ladislav

Re: 2 stop bit configiration in s12x SCI

kimsunmin — Thu, 14 Dec 2017 07:01:26 GMT

But I need to put a parity bit. I know the parity bit will be put between 1 stop bit and 9th bit.

In this case, how can I handle it??

Re: 2 stop bit configiration in s12x SCI

lama — Thu, 21 Dec 2017 19:07:12 GMT

Hi,

ups, I have read your question incorrectly. In this case the only solution I see in programming own SW routines for UART which is not very standard solution.

Best regards,

Ladislav

Re: 2 stop bit configiration in s12x SCI

AndersJ — Mon, 25 Dec 2017 08:48:41 GMT

Introduce a short delay after each transmitted byte.