topic Re: is therr a bootloader in qg8? in 8-bit Microcontrollers

is therr a bootloader in qg8?

HarrySun — Thu, 08 Mar 2007 00:07:56 GMT

Hello,

I could not program/debug a blank QG8 bought from freescale on my own board,via a P&E USB mulitlink, while I could do this on qg8 demo board,DEMO9S08QG8.

so when I need to program/ debug a blank qg8, I first put it on the demo board and program it with any code such as demo code ,put it back on my own board,then I can debug/program it.

can anybody tell me why?is there a bootloader being downloaded to a blank qg8 on a demo board while it doesn't do the same thing on my own board??

thanks very much

Harry

Re: is therr a bootloader in qg8?

peg — Thu, 08 Mar 2007 05:12:56 GMT

Hi HarrySun,

There is nothing progammed into a fresh from the factory QG.

The QG has to be handled differently when blank which I believe the demo board assists with.

See this thread about this problem:

http://forums.freescale.com/freescale/board/message?board.id=OSBDM08&message.id=136

Re: is therr a bootloader in qg8?

HarrySun — Fri, 09 Mar 2007 00:00:59 GMT

Peg,

well said,I appreciate it very much.

on the other hand , I am not convinced that this is a fully debugged design,for example, why should 0XFF be used as an instruction,STX,X??which makes things worse...

Have a nice day

Re: is therr a bootloader in qg8?

peg — Fri, 09 Mar 2007 13:02:22 GMT

HarrySun wrote:
Peg,

well said,I appreciate it very much.
on the other hand , I am not convinced that this is a fully debugged design,for example, why should 0XFF be used as an instruction,STX,X??which makes things worse...
Have a nice day

Hi HarrySun,

The use of this value for this opcode has a heritage stretching back for over 20 years. I doubt they are going to change it now.