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Not able to Program P89LPC921 using MCB900 in ISP mode

Hello,
I'm using MCB900 Version 4.0 board as ISP programmer. I was able to program P89LPC935 on board chip using Flash Magic Version 2.07.

But then I remove P89LPC935 from the board and use 5 Pin connection (Vdd,Vss,Txd,Rxd,RST) to program P89LPC921 using Flash Magic, Flash Magic was not able to communicate with device.

Does anybody know how to solve this?

ojas

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