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Thanks Erik!

My reset circuit is RC design same as the one in Philips AN461 page 12.  I am open for a reset supervisor device.  Any suggestion?

Thanks
Clarence

Andrew,

I had brought down my VCC ripple from 140mV to 72mV p-p with bypass cap.  Micro controller still won't program.

Clarence

Erik and Andrew,

Thanks for your speedy reply.  My reset circuit is same as the one in the Philips AN461 figure 3.  

I also did some measurement as you suggested and here are the finding:
The ripple on the VCC, GND and XTAL is not more then 140mV.
The voltage on the EA pin = 5V, PSEN = 40mV, P2.6  and P2.7 = 4.92V.

Thanks again.
Clarence

Hi All,

I am trying to program the P89C51RB2HBA with the Flash Magic but encounter the