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electronick
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Join Date: Jun 2007
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MC68HC705BD7P Programming

04/29/2010 10:30 AM

On the same TV that I got those magnetic inductors, I could save this micro controller...

My question is whether it can be reprogrammed , and if so how ( I am almost sure that it contains code protection registers...would it be possible to undo them?)

And with what programing devices?

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peterg7lyq
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#1

Re: MC68HC705BD7P programing

04/29/2010 10:40 AM

sorry i have no idea what your asking what tv ? and what controller ?
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#4
In reply to #1

Re: MC68HC705BD7P programing

04/30/2010 3:12 AM

http://cr4.globalspec.com/thread/53893

Click his name: then click Threads and blog entries by electronick
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electronick
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#5
In reply to #1

Re: MC68HC705BD7P programing

04/30/2010 6:46 AM

the TV was a nokia someting...I dont know as well!

the micro controler is a Motorola, and if you check the reply´s to this question you can see that it cannot be used, but if so it would take a million cares to do it.

Now I have time to play with this stuff´s, but in this case, lost the will to carry on.

It can´t be reused basically

cheers

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Tobugrynbak
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#2

Re: MC68HC705BD7P Programming

04/29/2010 5:58 PM

There are basically three versions one with a window and two without a window.

The window version can be reprogrammed after it has been erased using UV light ala eproms.

One of the non window versions is like the windowed version but is an OTP (One Time Programmable) device and once its programmed thats it. Though with a lot of aggro you could drill a hole over the eprom array and erase and reuse it. Not recommended though.

The third version is a masked rom version, where because the customer has a need for significant number of units with the same program. The required the chip is hard wired(hard programmed) with the program which saves production time.

Only the "windowed" version is reusable the other two are just landfill fodder. Er, to be recycled in an appropriate manner as per local regulations .....

As venerable as the 68HC705 is there are now much easier (cheaper) processors to play with.

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mjb1962853
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Engineering Fields - Electrical Engineering - Analog and Digital Circuit Design Engineering Fields - Electromechanical Engineering - Transformers, Motors & Drives, EM Launchers Engineering Fields - Engineering Physics - Applied Electrical, Optical, and Mechanical

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#3

Re: MC68HC705BD7P Programming

04/29/2010 11:36 PM

This part isn't one of them, but there are "flash" programmable micros which can be completely (electrically) erased and reprogrammed many times. However, even a flash micro may be "code protected" by fusing certain bits. Then it is not worth anything except maybe for scrap gold content.
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