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Messages - erikm

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LPC9xx/LPC9xxx / Re: P89LPC9221 FAQ
« on: August 07, 2006, 10:15:46 am »
so you are probably better off posting code related questions to the forum at

I do not think so, what you show is not 'code', but 'crap', code is commeted.


LPC9xx/LPC9xxx / Re: P89LPC9221 FAQ
« on: August 07, 2006, 06:34:52 am »
Oh the eternal issue:

"I replace things in the programmer, why does it not work?"

one answer only: "DUH"


Thanks a lot. I found the error last night. It was in Max232 interface chip. The chip was totally out.

although this is a specific FlashMagic forum, your posting of the problem and solution lead me to give you some non-FM information.

Ground is NOT alwways ground.  Many 232 transcievers have been blown due to non-optimal grounding of the PC and/or the uC board.  Be careful when hooking up the connection.  Connecting PC ground to uC ground can give really nasty power surges.

If your uC ground is conneted to power ground either remove that connection or ALWAYS connect the PC to the uC board before powering up the uC board.


1) wrong forum
2) why this antique


LPC9xx/LPC9xxx / Re: FM and lpc935 3 pulses reset
« on: July 11, 2006, 09:32:17 am »
It is a problem because it is not clear in the Philips doc's how NoTouch will benefit the designer....

there is no "Philips doc" on my idea, (there should be).

I agree that many will 'lose' a chip, but the buy another, they are not THAT expensive, install NoTouch and live happily ever after.

A note: NoTouch for lpc93x is not very much documented, but NoTouch is.


LPC9xx/LPC9xxx / Re: FM and lpc935 3 pulses reset
« on: July 10, 2006, 06:36:32 am »
why, oh why, do you guys not just install NoTouch (and 'the backdoor")

there will be no problems with timing, no problems with capacitances, no problem with inductances ....


this is not a Philips experience, but once I got 1000 chips that read as a 'better' variant.  We checked and they were, indeed, the 'better' variant (twice as much flash) evidently the manufacturer had relabeled the chips to overcome a shortage.

if, indeed, the 89C51RD2 is a superset of the P89C61X2 thais may be what happened.


LPC9xx/LPC9xxx / Re: ISP-P89LPC952
« on: June 21, 2006, 05:58:06 am »
As long as the device is an RS-232 transceiver then it will work.

AND A 3.3V chip (which the max563 is) but someone might read the above wrong.

Someone in Asia sell "devboards" (a bootleg copy of the manufacturers devboard) for a non-Philips 3V3 chip using a 5V transciever and there are forum posts "I use this devboard and I have this problem"


Reset supervisor ICs are recommended for flash based microcontrollers

I disagree!

Reset supervisor ICs are MANDATORY for flash based microcontrollers.

P89V51Rx2/P89LV51Rx2 / Re: Problem with P89V51RD2FA
« on: June 12, 2006, 06:29:09 am »
here is the real question:

do you believe in the urban legend "you do not need a MAX232(equivalent)?"


LPC9xx/LPC9xxx / Re: FM and lpc935 3 pulses reset
« on: June 02, 2006, 05:54:25 am »
adapted it at some points to counter
negative voltages produced by the PC serialport.
that "stinks" that you do believe the urban legend "a MAX232 3V equivalent is not needed

Apparently the first time it worked
and I could program (some non working) code into flash.
But now it is dead
The "first time" with a chip it is already in ISP mode so, programmable once means that the "kick into ISP" does not work

I noticed the LED which is connected to the rts (reset) line. It does not toggle three times after pushing the start button in FM
these pulses are too short for you to see with a LED, use a scope.

Is there another way to get the bootloader going except for the notouch method ?
too late, NoTouch MUST ne installed while the download works.


P89V51Rx2/P89LV51Rx2 / Re: Facing problems with 89V51RD2 board
« on: May 11, 2006, 05:52:11 am »
make the RS-232 interface standard.

What you describe is excatly what those that believe in the urban legend "you do not need a MAX232(equivalent)" get.

I may be wrong, but all indicators say so


LPC9xx/LPC9xxx / Re: LPC900 NoTouch ISP
« on: May 11, 2006, 05:49:42 am »
why all the problems, read up on NoTouch and 'the backdoor" the use NoTouch for the LPC and make a LPC v ersion of 'the backdoor'



P89V51Rx2/P89LV51Rx2 / Re: entering in ISP MODE 4 P89V51RD2FN
« on: April 24, 2006, 08:35:44 am »
This is based on the P89LPC935 controller, your details may differ, check details with your particular processor's user manual.
the 'V' chips enter ISP maode if a "U' is seen 300?ms after reset.  nothing more.  So to enter ISP on a 'V' chip, run 'U's on the serial and THEN let the 'V' out of reset.


P89V51Rx2/P89LV51Rx2 / Re: entering in ISP MODE 4 P89V51RD2FN
« on: April 24, 2006, 06:02:01 am »
plz reply ot above msg. its urgent.

I am so sorry, most of those that give FREE davice do not do so on weekends.  I know that we should set our alarm clo0ck to ring every 2 hours so we can see if someone is asking for FREE advice, I admit we fail at out obligation.


wat shld be the status of EA/ , PSEN for entering ISP MODE??
shld EA/ PIN pulled high on rest for entering in ISP mode??


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