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Topics - bmn123

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P89V51Rx2/P89LV51Rx2 / Unable to program P89V51RD2
« on: October 05, 2007, 06:42:56 am »
I am programming a P89V51RD2 with a 12MHz crystal using a USB-RS232 adapter.

However, I keep getting a message which says:-

UNABLE TO COMMUNICATE. TRY REDUCING THE BAUD RATE. RESET THE HARDWARE INTO ISP MODE.

I have tried every Baud rate available and still get this message.

What should I do to solve this problem?

Edit: I have tried unchecking the "Use DTR to control RST" box. That gives me the message "RESET THE DEVICE TO ISP MODE NOW". However, switching OFF and ON the power supply or pressing an external RESET button does not help at all.

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