P89LPC935 ISP

[tuxi]

Hello,

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: www.zlgmcu.com 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

greets
Flo

[Andy Ayre]

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.