Problems with P89LPC935

[eagle]

Hi,

I have a problem with P89LPC935.

I have designed a electronic board for the signal of RST.

This signal is correct, then first i send this signal to he uC. Then I intent program the device.

In this moment, i use the Flash Magic. The first time the device is programed, but when i wish to program more times, the device don't do anything, the Flash Magic tell me "Unable to communicate. Ensure no other applications are using the COM port. Try raising or lowering the baud rate".

I don't understand anything. Why the device is good the first time and never more

[erikm]

I don't understand anything. Why the device is good the first time and never more

[eagle]

Then,  What I must do?

What is "Notouch"?

I only have a computer with Keil uVision3 and my board connected with a RS-232 for programming.

I am lost, because I must test several times and I cannot.

Any idea

[erikm]

there is a link to NoTouch at this site.  READ about NoTouch for the P89C (that is where the explanations are) and use the NoTouch for LPC

Erik

[DB1BMN]

Hallo,

I

[Andy Ayre]

If a device fails to enter ISP mode then it doesn't mean that the device can't be used.

Are these brand new devices?
Are you using the MCB900 board or something else?
If you are using something else is the circuit design identical to the MCB900?

[DB1BMN]

Hi,

yes the devices are new from german vendor Reichelt.
The Board im using is the one published in the german Electronics-Magazine "Elektor", November 2003, whis is a copy of the MCB900.
[...]
But wait, now I

[erikm]

I would never get the idea that there was an error in the hardware of an 3rd party!


did you start in this business yesterday?

[eagle]

Ok, i already have the Notouch() routins, but

Where do i call the function in my program in Keil?

[erikm]

wherever you want
examples
at SRATUP: if TxD is held low (known as 'the backdoor')
if a string e.g. "QWERTY" is received serailly
if 1 and 7 are pressed simullatneously
if p1,4 is pulled down
if ,,,,

Erik