topic Re: QT = QD ??? in 8-bit Microcontrollers

QT = QD ???

JO_O_BR — Tue, 17 Feb 2009 20:44:42 GMT

Hello,

I need to chage from QT (MC68HC908QT2) to QD???

How can I do this???

Can I do this??? Will I need change my prograns???

Which is the better QD to replace the QT2???? If it is possible...

Tanks,

Sorry my bad english... hahaha

Re: QT = QD ???

fabio — Tue, 17 Feb 2009 22:04:29 GMT

Hello Joao,

I presume you are talking about the MC9S08QD. As it is an HCS08 device, there are differences on the object code and a lot of differences on the peripherals and their registers.

Your code will need to be re-written to work on the QD device.

And about your second question, try an MC9S08QD2 as a replacement for your QT2 device.

Regards,

Re: QT = QD ???

Lundin — Wed, 18 Feb 2009 15:57:34 GMT

Biggest difference is that S08 has a BDM programming interface and not the crappy MON08. This means that your hardware gets less complicated and your products less error-prone, so it is an entirely good thing.

Re: QT = QD ???

JO_O_BR — Thu, 05 Mar 2009 18:54:51 GMT

Tanks for answers!!!

I have a new question. Lundin comment about the programing...

My program has build in C using CodeWarrior IDE. I was thinking that I'll only need to correct the I/O ports and the main of program won't be unchanged.

But then it will not work???

But I can use the same command of the QT main program??? Or I'll need to change everything???

Re: QT = QD ???

fabio — Thu, 05 Mar 2009 21:20:09 GMT

Hello Joao-BR,

Lundin is talking about physical device programming (and debugging) and you are asking about logical device programming.

Well, in either way, HCS08 is different from HC08, despite using a similar CPU, the HCS08 includes new addressing modes for some instructions, different peripherals and a new (not so new indeed) programming/debugging interface.

If you plan switching to an HCS08 device, I'll have to re-write your application all peripheral registers have different names and work in a different way.

I live in Brazil and own a design house here (in Santa Catarina), maybe we can help you out in migrating from one plataform to another.

Regards,