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Messages - erikm

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General Discussion / Re: help requierd regading LPC936
« on: April 05, 2007, 06:43:37 am »
I may be able to help you, but can not unbderstand, please translate


LPC9xx/LPC9xxx / Re: ICP problems on custom board
« on: March 23, 2007, 05:45:37 am »
The board is very similar to the MCB900 ... if I use the original MCB900 board with this device I'm able to make all the functions on ISP & ICP.

could the answer be in the question?

in the = fortunately long gone - days of kitchen table programmers for the non-ISP '51s there was, almost daily a forum therad "why does my programmer not work, I copied xxx".  Invariably those threads ended up with "yes., I substituted ..., but that should not make a difference" and invariably that was the cause.

f you substitute just a transistor, it can be that a difference in the beta give a subtle change in timing and - OOPS - the thing does not work.

let us know what makes it not 'a copy' but 'very similar' and maybe the cause can be found.


LPC2xxx / Re: Use with a Virtual COM port
« on: March 22, 2007, 09:54:44 am »
Somewhere in this forum (search) there is a thread "USB to serial converters that work"  and many threads "this USB to serial converter does not work"

Most USB to serial converters are 'tested' to work with a modem and shipped as a load of crap that happen to work for the 'popular' use.


Off-Topic (Read Only) / Re: help using DAC in LPC925
« on: March 20, 2007, 12:09:10 pm »
repost at, that is where it belongs


LPC9xx/LPC9xxx / Re: problem in ISP programming of 89LPC938
« on: February 21, 2007, 05:31:30 am »
Can the new IC be directly programmed using the flash magic

if 'new' means 'factory fresh' then yes.


General Discussion / Re: 938 cheaper than 932
« on: February 06, 2007, 06:21:24 am »
I do not know about the '38, but at DigiKey the '35 is $0.02 more than the '32.  Thus I use the '35 and have found nothing that would make me look at "does the '32 have it?"


LPC9xx/LPC9xxx / Re: WORKING ISP NoTouch code P89LPC935 P89LPC9321
« on: February 06, 2007, 06:19:27 am »
If your can't jmp to 1F00h (eg code stuck in a loop or other) then you can't activate the NoTouch bootloader, and ISP hardware entry will be required

Thsat is why "the backdoor" was invented. Read all about it.  the same can easily be applied to any proceoor version of NoTouch.  With "the backdoor" hold a port pin low, reset and you are in business.


LPC9xx/LPC9xxx / Re: connection problem with MCB900
« on: February 01, 2007, 01:20:13 pm »
Once  once you get your NoTouch code working... you can throw away the ICP and ISP hardware.... but during developpment - if your code breaks (eg stuck in a loop and you can't execute NoTouch)..... you will need to use ICP or ISP to recover the micro.

That is why I invented "the backdoor" have a read.

I know that all "literature" te NoTouch etc is in the P89C documents, but reading them and transferring the ideas will take you no more than 5 minutes.


LPC9xx/LPC9xxx / Re: connection problem with MCB900
« on: January 31, 2007, 06:08:21 am »
So ICP is more reliable than ISP

ISP is totally reliable when the rules are followed.  I have used ISP extensively and never used ICP and have yet to have a failure (save one where I had to call myself an idiot)

That failure made me develop NoTouch and 'the backdoor' and I have since had none, zero, nada problems.


P89C51Rx+/P89C51Rx2/P89C66x/P89C6xX2/P89V66x / Re: 89C51RD2 read
« on: January 30, 2007, 06:06:11 am »
"can I read the program stored in a 89C51RD2?

if it is not protected (protect bits not set)you can read it in a parallel programmer.

If the protect bits are set you can not.


P89C51Rx+/P89C51Rx2/P89C66x/P89C6xX2/P89V66x / Re: 89C51RD2 read
« on: January 29, 2007, 12:36:35 pm »
whatever your name is (I refuse to addres anyone by a STUPID monnker, what on earth is wrong with your name):

do you mean "can I read the program stored in a 89C51RD2?


LPC9xx/LPC9xxx / Re: How to recover back to isp
« on: January 29, 2007, 06:56:16 am »
any chip, whatever is erased, can be programmed in a parallel programmer.

the chips are not that expensive (digikey $2), if you do not have, or know someone with, a parallel programmer, just buy a new chip.  Of course, if you have done it to a bunch of chips, buying a parallel programmer (stay away fro Xeltek) may be the better choice.


LPC9xx/LPC9xxx / Re: Difference betw Port Pin and latch
« on: January 24, 2007, 05:31:22 am »
What is the difference between Port Pin and Port Latch?

1) wrong forum - what does this have to do with FlashMagic

2) read "the bible" if you are not familiar with "the bible" you will be genarlly lost whatever you do with any '51 derivative

here are the links to "the bible"
Chapter 1 - 80C51 Family Architecture:

Chapter 2 - 80C51 Family Programmerís Guide and Instruction Set:

Chapter 3 - 80C51 Family Hardware Description:

do you have P2.6 and P2.7 high?


LPC9xx/LPC9xxx / Re: Debug of no_touch935
« on: January 11, 2007, 10:10:28 am »
Erik, What do you think about this?


I developed the NoTouch for the P89C51Rx2 and P89C66x and THERE I can help you all the way. I have not used NoTouch on a LPC except the older 932, for which the LPC NoTouch posted here works.  i had to replace the LPC I used with a different brand to get CAN connectivity when that was requested and have thus not done any LPC work for 2 years.  Basically all NoTouch does is go through the steps shown in the datasheet as "getting to ISP".  The same should exist in the datasheet for whatever device you use.  As far as I can see Joe Gold is your best resource here (NoTouch and lpc92x.


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