8-bit MicrocontrollersのトピックQG8-FREQUENCY CHANGE TO...

QG8-FREQUENCY CHANGE TO...

HarrySun — Tue, 05 Feb 2008 23:20:59 GMT

Hello,

in debuging mode with QG8,the window located at the right corner of debugger always shows "Frequency change to ~0","Frequency change to ~55296","Frequency change to ~998656h",these three messages shows alternatively many times(the set frequency is 1mhz).

I understand this means the debugger is trying to synchronize QG8, but why is it changing all the time?does this mean QG8 frequency is changing all the time too?

thanks very much

Message Edited by HarrySun on 2008-02-05 03:21 PM

Re: QG8-FREQUENCY CHANGE TO...

JimDon — Wed, 06 Feb 2008 00:03:21 GMT

In a word, yes that is what it means.
I have seen this when using an external xtal, I put a scope probe on the xtal, causing to oscillate erratically.

What are you using for clocks?

Re: QG8-FREQUENCY CHANGE TO...

HarrySun — Fri, 08 Feb 2008 04:28:43 GMT

thanks Jim.

I use the 16-MHz internal clock and bus frequency is set to 1Mhz.

but why is it changing all the time?

when it is "0",does that mean the inteneral clock stops?

thanks a lot

Re: QG8-FREQUENCY CHANGE TO...

JimDon — Fri, 08 Feb 2008 04:48:19 GMT

It means the BDM thinks thats it's 0.
You settings sound perfectly ok. Did you use PE to generate the init code?
What BDM are you using? - I will try it tonight and see....

Re: QG8-FREQUENCY CHANGE TO...

HarrySun — Fri, 08 Feb 2008 23:13:17 GMT

Jim,

thanks very much for your prompt reply.

I didn't use PE ,I coded the initial setting myself.

I use P&E USB multilink,HCS08/HCS12 and coldeworrior IDE version is 5.7.0