topic Help whith RS232 communication for KA8 in 8-bit Microcontrollers

Help with RS232 communication for KA8

Eliezer — Fri, 19 Aug 2011 03:32:51 GMT

I am new to programming microcontrollers, Freescale, and I can not build a program

that transmits data to the computer via an RS232 port.

I'm using a MC9RS08KA8, please someone help me

Re: Help with RS232 communication for KA8

bigmac — Fri, 19 Aug 2011 11:15:59 GMT

Hello, and welcome to the forum.

Unfortunately, the 'RS08KA8 does not contain a SCI module, the hardware that will support serial communications. While it is possible to simulate SCI operation in firmware, this is a more complex process, and the timiing is critical.

If you have little previous experience with microcontroller programming, I might suggest that you consider using an alternative device that contains a SCI module. Additionally, the use of the RS08 family will add further programming complication, because of some limitations of this "scaled down" family.

I might suggest that you choose to experiment initially with an evaluation board from the '9S08 family. Most of these devices provide a SCI module. Depending on your ultimate requirements, the '9S08QG8 might be a reasonable choice.

Regards,

Mac

Help whith RS232 communication for KA8

Eliezer — Fri, 19 Aug 2011 18:13:08 GMT

Hello Mac

I am grateful for the attention.

Indeed I have very little experience in programming and thanks for the advice.

Seizing the opportunity, I wonder if you have any examples for HCS08 or GQ I take a look.

Thanks in advance.

Re: Help whith RS232 communication for KA8

bigmac — Tue, 23 Aug 2011 18:07:31 GMT

Hello,

I found the attached CW project, applicable to the MC9S08QG8 demo board. The code is capable of testing the various peripheral modules, and communicates to a computer using the SCI module.

Regards,

Mac

Re: Help whith RS232 communication for KA8

Eliezer — Tue, 23 Aug 2011 21:02:46 GMT

Thank you very MAC.