Problem to read eeprom in hc908az60 with upa

[jp_olli]

I?m trying to read the mcu memory with upa, but with no success yet.

The mcu is from a airbag unit 0 285 001 373 wich is used in Mercedes Benz.

Anyone had similar problem, or am I missing something? Is there some kind of encryption or security byte?

Don?t know if the mcu is broken or not. Then I would need a new dump for it also.

Well, thanks in advance if someone can share some info.

[BeianM]

same chip, different application.
Hope this helps some.
http://www.digital-kaos.co.uk/forums...87/index2.html

[jp_olli]

UPA still says the following:

Reading: 1 Errors found device: MC68HC908AZ60 Range: 00-3FF

The mcu mask is 2J74Y

[mcm44]

What do you looking for in 2J74Y in this airbag unit? Crash?

[MEH]

UPA still says the following:

Reading: 1 Errors found device: MC68HC908AZ60 Range: 00-3FF

The mcu mask is 2J74Y

OK it is normal

you do same work but before you click on read button

first time you click on the AUTO BAUD RATE button
AND AFTER YOU CAN CLICK READ BUTTON

TRY AND POST RESULTS

[jp_olli]

What do you looking for in 2J74Y in this airbag unit? Crash?

The unit is locked because of excessive battery voltage due to a broken alternator.

If I go back to basics to the pins I should use...

D-sub MCU
P1 2 #IRQ1
P2 26 PTA0
P3 63 PTC3
P5 21 VSS
P6 60 PTC0
P7 3 #RESET
P8 61 PTC1
P9 22 VDD

Now if use these pins I get "Reset high error". UPA shows that reset would be pin7. But then I get "device not respond"

[jp_olli]

So no one knows this problem... :P

[ledojo]

I had a similar problem... not with this mcu though...

Check that uusp jumper is set to 3.3V? I believe that once I changed it to 3.3V it read the data fine. Of course, this is not the same mcu and assuming the connections are correct. Even still, this is probably completely different.

As for the setting in the software, I don't think it made a difference, but you should probably select 3.3V there also.

[Ramzai]

I had a similar problem... not with this mcu though...

Check that uusp jumper is set to 3.3V? I believe that once I changed it to 3.3V it read the data fine. Of course, this is not the same mcu and assuming the connections are correct. Even still, this is probably completely different.

As for the setting in the software, I don't think it made a difference, but you should probably select 3.3V there also.

For Motorolla pressure should be 5 volt.

[turbodeuce]

Lift pins IRQ(2) and PTAO(26). You sound a little frustrated.

[jp_olli]

Frustrated, yes a bit I guess.

Actually I have removed the mcu from the original pcb to a adapter pcb wich is connected to UPA.

Well I?m at my summer holiday but as being self employed this is also a hobby.

[jp_olli]

I just had this thought... Should I have some kind of resonator/clock circuit for the mcu on the adapter board?

The board I?m using is the following type: http://cgi.ebay.com/QFP-QFP64-QFP44-...item563b93f176

Does the UPA-USB provide clock signal to the mcu?

Last question... Would it be better to do the reading/programming leaving the mcu on the original pcb?

Again a bunch of questions, but maybe this will be solved and help someone else too.

[ledojo]

I was looking at the uusp manual and was wondering what the dashed line leads means. They're dashed for PTC3 and VDD. That may have something to do with reading while still on the board?

I was thinking that with the mcu still on the board and only certain pins lifted, the original pcb may be providing different essential parts of the circuit enabling you to read it.... All guesses here as, if I came across this chip, I would have no idea what to do.

I wish I had one of these to mess with.

Oh, and doesn't the 78K0/HC912 have the oscillation/clock function built-in? Could this adapter be utilized in reading the HC08's? Not sure, but if you could translate pinouts and such... crazy talk.

[jp_olli]

Ok. Now I can finally read it.

And the problem was the supply voltage. I measured the supply with only USB connected, the result was 4,60 Volts.

I changed the jumper setting to external power supply and got the supply to 4,76 Volts and then I was succelsful with the reading.

So try this before

Now trying to clean the dump at Tachosoft site.

[jp_olli]

Ok. Now I?ve read/programmed three airbag sensors. So this case is closed.