Author Topic: P89LPC935 ISP  (Read 3332 times)


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« on: June 01, 2005, 08:58:19 am »

i have the P89LPC935 MCU and i implemente the Circuit from flashmagic for ISP. Now i can't buy anywhere the MAX563 and the Maxim don't sand me any samples from this, but i fund a other chip the MAX3222 and i can't finde any differents on the Data Sheet.
Now i implement the Circuitn with this and it run not realy. Flashmagic can erase the Flash but very very slowly. I view the Data on the Serial device and i see that came data period and than is 1-2 secound pause. Programming from the MCU isn't posible.

I tryed the CP900 Programmer V1.5 from: it works faster but now it  dosen't work.

Gave's any settings spezial in flashmagic for the P89LPC935 MCU or is the Problem the MAX3222 Transciver.

Thanks for your help


Andy Ayre

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Re: P89LPC935 ISP
« Reply #1 on: June 01, 2005, 01:50:19 pm »
I suggest you read through the Flash Magic application note regarding Hardware ISP entry using Handshaking signals. Use a scope to see if the waveforms you are observing are similar to what is expected.

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