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Hello Andy

As per your instructions, I checked the "cleanliness" of the power supply and if the DC and AC requirements were being met. Both are OK.

Am I correct to anticipate that the Boot-block of the chip has been erased or corrupted?

If, yes, then can it be re-programmed?

The reason for me thinking this way is the data sheet states that Boot Block can be erased using a parallel programmer and then it can be re-programmed with ISP/IAP code from Philips.

The code is available at the url: http://www.nxp.com/files/products/standard/microcontrollers/flash/philips_ice_block_1.hex

Andrew,I appreciate your prompt response.

 I would be glad if you could explain what do you mean by:-

"Did you decouple of power supply, ensured it was clean, etc.?"

Regards,
Haresh

Hello everyone,

Can any one assist me with the issue am experiencing.

I am using Philips P89V51RD2BN for my project; Flash Magic to program it.

The issue:-

I was able to read the device signature 4 or 5 times earlier.

After that when I built a simple project using Keil uVision 3 that  toggled pin 1.0 of  the micro-controller it would not run.

The project included a simple file with the following code:-

#include
 
#include

void main(void)
{
 unsigned int i;

  while(1)
 {
   P1 = 0x01;
   for(i=0;i<50000;i++);
   P1= 0x00;
 }  
}

Using the debug utility of Keil I found that the code was correct and was giving the desired output.

With a Digital Multi-meter I tried to check if the output at the pin was toggling or not. There was no change at the pin it remained 5V. Also, all the other pins showed 5 V. I reset the device, and then tried to re-program the device. But still there was no desired output.

I attempted once more, Then mid way, I attempted to cancel the burning. While the cancellation was going on, there was a power failure.

After that whenever I try to read the device, I am prompted to reset the device in ISP mode. I tried reducing the Baud Rate (as prompted a few times), but with no results.

For the reset circuit, I have connected a 10uF (electrolytic) capacitor in series with a 8.2K resistor between the Vcc[5V] and ground.The node of R-C  has been connected to the pin 9 of the controller. A push-button switch has been connected across the capacitor.

Post Edited (09-10-06 06:49)