Subject:
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Re: How to disable ROM on E9 part?
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 2 Jul 1996 04:30:47 GMT
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Original-From:
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Fred G. Martin <fredm@media.{spamless}mit.edu>
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Viewed:
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3987 times
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Hi Curt,
something is wrong with your board.
1stly, the red LED should be completely off when in boot download
mode. this is stated repeatedly in the doc's, but i reiterate it
here.
2nd, you should not have 1.4v on the CPU when pwr is off. i don't
have a board handy to measure it, but this is not good.
check your ds1233 chip. when you power on your board, it should hold
reset low for 1/3 sec. if that is not happening, try pulling the CPU
and other chips till it works.
-f
In your message you said:
>
> I hate replying to my own posts, but I think I know a bit more about
> the problem now, therefore different questions are in order.
>
> Answer to my first question:
> It looks like the HC11 is supposed to automatically clear the EEPROM,
> CONFIG, and RAM if it is brought up in bootloader mode and the security
> options were enabled. I learned this by reading the bootloader program
> listings in the back of the reference manual, and a bit in the text.
>
> So this brings up a different question:
>
> Is the PWR LED supposed to glow dimly when the power switch is off?
>
> I have 5.0VDC to the RAM, and about 1.4VDC to the CPU with the power
> switch off. This is with the charger board powered-up and connected,
> and no NiCad pack. I assume the 1.4VDC is coming from the RAM
> address/data lines into the CPU, and I don't think this should be a
> problem, as the CPU is in reset at this point, and therefore not
> running. The 5.0VDC to the RAM makes sense, due to the extra
> regulator for just such a purpose.
>
> The PWR LED is brightly lit after the STOP/Power-on sequence,
> therefore I have not been able to download any code yet into the
> HandyBoard using DL, DLM, or HBDL (As I understand it, the PWR LED
> should go out about the time that the RESET is finished if in
> bootloader mode).
>
> Looking for any hints to try to get the board into download mode.
> When I try to put the board into download mode, the MODA signal
> pulses at 767kHz. I think this is ok because it functions
> as the LIR* output pin after reset... MODA goes to about 430mVDC
> when the STOP button is depressed, which should be low enough to
> be recognized by the CPU.
>
> The piezo also does a double-click every few seconds when I try
> to put the board into download mode, and doesn't make a sound if
> I just turn the board on, so at least something is different. Is
> this normal operation for TOC5 in bootstrap mode?
>
> Any ideas?
>
> Curt, WE7U.
> hacker@tc.fluke.com
> http://www.eskimo.com/~archer
>
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Message is in Reply To:
 | | Re: How to disable ROM on E9 part?
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| I hate replying to my own posts, but I think I know a bit more about the problem now, therefore different questions are in order. Answer to my first question: It looks like the HC11 is supposed to automatically clear the EEPROM, CONFIG, and RAM if (...) (30 years ago, 1-Jul-96, to lugnet.robotics.handyboard)
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